Flies

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Ocellate gall midge
Ocellate gall midge (Acericecis ocellaris). Willistown, PA.
Asian tiger mosquito
Asian tiger mosquito (Aedes albopictus). Swarthmore, PA.
Asian tiger mosquito
A male Asian tiger mosquito (Aedes albopictus) nectaring on swamp milkweed (Asclepias incarnata).
Asian tiger mosquito
Newly eclosed Asian tiger mosquito (Aedes albopictus) on water. Male. Springfield, PA.
Asian tiger mosquito
Newly eclosed Asian tiger mosquito (Aedes albopictus) that had developed in an indoor water bowl for pets. This is a male (e.g., note large, extended maxillary palps; cercus at abdomen). Swarthmore, PA.
Asian bush mosquito
Asian bush mosquito (Aedes japonicus) with blood meal. Also known as Ochlerotatus japonicus. Media, PA.
Amblyonychus sp.
Robber fly (possibly Amblyonychus sp.) with prey. Guanacaste province, Costa Rica.
Amobia sp.
Amobia sp. near nest of wasp (Trypoxylon collinum). Swarthmore, PA.
Grape filbert gall
Grape filbert gall (Ampelomyia vitiscoryloides). On wild grape. Formerly named Schizomyia coryloides. Rushton Woods Preserve, Willistown, PA.
Grape filbert gall
Grape filbert gall (Ampelomyia vitiscoryloides). Fomerly known as Schizomyia coryloides. Gambier, Ohio.
Anthomyia illocata
Anthomyia illocata. From Asia. Swarthmore, PA.
Anthrax georgicus
Anthrax georgicus. Male. Hildacy Farm Preserve, Media, PA.
Euthamia leaf gall midge (Asteromyia euthamiae)
Euthamia leaf gall midge (Asteromyia euthamiae). Hildacy Farm, Media, PA.
Bermudagrass stem maggot
Bermudagrass stem maggot (Atherigona reversura). Zolfo Springs, FL.
Atomosia puella
Atomosia puella. Goshen Trail, Newtown Square, PA.
Atomosia puella
Atomosia puella. Taylor Memorial Arboretum, Wallingford, PA.
Atomosia puella
Atomosia puella with prey. Swarthmore, PA.
Atomosia puella
Atomosia puella. Swarthmore, PA.
Bibio longipes
Male, perched on seed of Japanese knotweed. Smedley Park, Springfield, PA.
Eastern phantom crane fly
Male eastern phantom crane fly (Bittacomorpha-clavipes). Crow’s Nest Preserve, Elverson, PA.
Common wood fly
Common wood fly (Blera badia). Little Crum Creek Park, Swarthmore, PA.
Houdini fly
Houdini fly (Cacoxenus indagator). Swarthmore, PA.
Houdini fly
Houdini fly (Cacoxenus indagator). Swarthmore, PA.
Houdini fly
Houdini fly (Cacoxenus indagator). Swarthmore, PA.
Houdini fly
Houdini fly (Cacoxenus indagator). Swarthmore, PA.
Pink gall
Possibly Rhopalomyia (Cecidomyiidae). On rabbitbrush. Prineville Reservoir, Prineville, OR.
Hackberry thorn gall  midge
Hackberry thorn gall midge (Celticecis spiniformis). Media, PA.
Hackberry thorn gall  midge
Hackberry thorn gall midge (Celticecis spiniformis). Media, PA.
Hackberry thorn gall  midge
Hackberry thorn gall midge (Celticecis spiniformis). Media, PA.
Cerotainia albipilosa
Cerotainia albipilosa. Gambier, Ohio.
Cerotainia macrocera
Cerotainia macrocera eating a thrips. ID tentative. Hildacy Preserve, Media, PA.
Snow fly
Male snow fly (Chionea scita). Mohonk Mountain House, New Paltz, NY.
Chironomidae
Midge (Chironomidae). Zolfo Springs, FL.
Quadrate snipe fly
Quadrate snipe fly (Chrysopilus quadratus). Swarthmore, PA.
Golden-backed snipe flies
Golden-backed snipe flies (Chrysopilus thoracicus). Swarthmore, PA.
Golden-backed snipe flies
Golden-backed snipe flies (Chrysopilus thoracicus). Swarthmore, PA.
Golden-backed snipe flies
Golden-backed snipe flies (Chrysopilus thoracicus). Swarthmore, PA.
Golden-backed snipe fly
Golden-backed snipe flie (Chrysopilus thoracicus). Swarthmore, PA. Swarthmore, PA.
Golden-backed snipe fly
Male golden-backed snipe fly (Chrysopilus thoracicus). Swarthmore, PA.
Golden-backed snipe fly
Chrysopilus thoracicus (golden-backed snipe fly). Rushton Woods Preserve, Willistown, PA.
Bathroom moth fly
Bathroom moth fly (Clogmia albipunctata) resting on computer monitor. Swarthmore, PA.
Condylostylus mundus
Male Condylostylus mundus. Zolfo Springs, FL.
Condylostylus sp.
Condylostylus sp. with prey. Zolfo Springs, FL.
Cordyligaster septentrionalis
Cordyligaster septentrionalis. Rusthton Preserve, Willistown, PA.
Leaf mine of the beautiful Cosmopterix moth (Cosmopterix pulchrimella). ID tentative, based on host plant (Pilea pumila) and mine pattern. Hildacy Preserve, Media, PA.
Mosquitoes on ice
Mosquitoes (Culex sp.) on surface of ice. Swarthmore, PA.
Mosquitoes on ice
Mosquitoes (Culex sp.) on surface of ice. Swarthmore, PA.
Mosquito on ice
Mosquito (Culex sp.) on surface of ice. Swarthmore, PA.
Culex
Culex sp. Swarthmore, PA.
White dotted mosquito
White dotted mosquito (Culex restuans). ID tentative. Swarthmore, PA.
Ash bullet gall
Dasineura pellex (ash bullet gall). Ridley Creek State Park, Media, PA.
Ash bullet gall
Dasineura pellex (ash bullet gall). Ridley Creek State Park, Media, PA.
Dasineura pudibunda
Dasineura pudibunda gall on ironwood leaf. Hildacy Preserve, Media, PA.
Dasineura pudibunda
Dasineura pudibunda gall on ironwood leaf. Hildacy Preserve, Media, PA.
Hornbeam leaf gall midge
Hornbeam leaf gall midge (Dasineura pudibunda). Springfield, PA.
Common picture-winged fly
Common picture-winged fly (Delphinia picta). Swarthmore, PA.
Bristle fly
Bristle fly (Dexiinae) on leaf. Rose Tree Park, Media, PA.
Diamesa nivoriunda
Snow midge (Diamesa nivoriunda). ID tentative. Hildacy Preserve, Media, PA.
Dioctria hyalipennis
Dioctria hyalipennis. Mohonk Mountain House, New Paltz, NY.
Three flies eating feces
Three flies eating bird feces. Crow’s Nest Preserve, Elverson, PA.
Fly on chipmunk scat
Unidentified fly eating chipmunk scat. Mohonk Mountain House, New Paltz, NY.
Unidentified fly
Unidentified fly. Swarthmore, PA.
Long-legged fly
Long-legged fly (possibly Dolichopus). Swarthmore, PA.
Efferia aestuans
Efferia aestuans. ID tentative. Swarthmore, PA.
Efferia aestuans
Efferia aestuans ovipositing into meadow garlic (Allium canadense). Willistown, PA.
Efferia aestuans
Efferia aestuans. ID tentative. Swarthmore, PA.
Efferia sp.
Copulating robber flies (Efferia sp.). Longwood Gardens, Kennett Square, PA.
Efferia
Efferia sp. on thorny stem. Hildacy Preserve, Media, PA.
Erioptera vespertina
Erioptera vespertina with mite. Goshen Trail, Newtown Square, PA.
Yellow-shouldered drone fly
Yellow-shouldered drone fly (Eristalis stipator). Los Feliz, California.
Eudioctria albius
Robber fly (Eudioctria albius) with mite (Trombidium sp.). Taylor Memorial Arboretum, Wallingford, PA.
Eudioctria sp.
Eudioctria sp. copulating. Rose Tree Park, Media, PA.
Goldenrod gall fly, bunch gall midge
Goldenrod gall fly (Eurosta solidaginis) and goldenrod bunch gall midge (Rhopalomyia solidaginis). Cornell Ornithology Lab, Ithaca, NY USA.
Goldenrod gall fly
Eurosta solidaginus (goldenrod gall fly) gall. Gambier, Ohio.
Geranomyia virescens
Geranomyia virescens on tomato leaf. ID tenative. Zolfo Springs, FL.
Geron sp.
Geron sp. on purple aster. Crooked River National Grassland, Madras, OR.
Geron sp.
Geron sp. on purple aster. Crooked River National Grassland, Madras, OR.
Gnophomyia tristissima
Gnophomyia tristissima. On rotting log in moist forest.
Gnophomyia tristissima
Gnophomyia tristissima. Media, PA.
Gnophomyia tristissima
Gnophomyia tristissima. On rotting log in moist forest.
Gnophomyia tristissima
Gnophomyia tristissima copulating. Goshen Trail, Newtown Square, PA.
Gnophomyia tristissima
Gnophomyia tristissima on rotting log. Goshen Trail, Newtown Square, PA.
Gnophomyia tristissima
Gnophomyia tristissima. Ridley Creek State Park, Media, PA.
Grallipeza nebulosa
Grallipeza nebulosa. Myakka River State Park, Florida.
Black soldier fly
Hermetia illucens (black soldier fly). Swarthmore, PA.
Holcocephala sp.
Small robber fly (Holcocephala sp.) with prey. Newtown Square, PA.
Limonia annulata
Limonia annulata on beech tree. Rose Tree Park, Media, PA.
Yellowjacket hover fly
Yellowjacket hover fly (Milesia virginiensis; Syrphidae) ovipositing on decaying tree stump. Clayton Park, Monmouth County, New Jersey, United States.
Freeloader flies (Milichiidae) sharing meal with Chinese mantid
Freeloader flies (Milichiidae) sharing meal with Chinese mantid. Swarthmore, PA.
Muscid
Fly on mushroom. Musoidea. Swarthmore, PA.
Neoempheria balioptera
Neoempheria balioptera clinging to the underside of dryad’s saddle (Cerioporus squamosus). Rose Tree Park, Media, PA.
Neoitamus flavofemoratus
Neoitamus flavofemoratus. Rushton Woods Preserve, Willistown, PA.
Neoitamus flavofemoratus
Neoitamus flavofemoratus on rose. Rushton Woods Preserve, Willistown, PA.
Neoitamus flavofemoratus
Neoitamus flavofemoratus. Female. Goshen Trail, Newtown Square, PA.
Ferruginous tiger cranefly
Ferruginous tiger cranefly (Nephrotoma ferruginea). Male. Zolfo Springs, FL.
Ochthera tuberculata
Ochthera tuberculata. Myakka River State Park, Florida.
Ochthera tuberculata
Ochthera tuberculata. Myakka River State Park, Florida.
Ommatius tibialis
Ommatius tibialis. Taylor Memorial Arboretum, Nether Providence, PA.
Ommatius tibialis
Ommatius tibialis. Hildacy Preserve, Media, PA.
Physocephala tibialis
Physocephala tibialis copulating. Willistown, PA.
Physocephala tibialis
Physocephala tibialis. Swarthmore, PA.
Physocephala tibialis
Physocephala tibialis on hydrangea. A potter-wasp mimic that parasitizes bumble bees. Mohonk Mountain House, New Paltz, NY.
Common lovebugs
Copulating pair of common lovebugs (Plecia nearctica). Zolfo Springs, FL.
Common lovebugs
Common lovebugs (Plecia nearctica) copulating. Archbold Research Station, Venus, FL.
Oak leaf gall midge
Oak leaf gall midge (Polystepha pilulae). Jessup, PA.
Promachus princeps
Promachus princeps (Asilidae) copulating on rabbitbush. Female is eating a longhorn beetle. Crooked River National Grassland, Madras, OR.
Promachus princeps
Promachus princeps. Crooked River National Grassland, Madras, OR.
Red-footed cannibal fly
Red-footed cannibal fly (Promachus rufipes). Paines Creek Historic Park, Bowling Green, Florida.
White-footed woods mosquito
White-footed woods mosquito (Psorophora ferox) nectaring on goldenrod. John Heinz National Wildlife Refuge, Philadelphia, PA.
White-footed woods mosquito
White-footed woods mosquito (Psorophora ferox) nectaring on goldenrod. John Heinz National Wildlife Refuge, Philadelphia, PA.
White-footed woods mosquito
White-footed woods mosquito (Psorophora ferox) nectaring on goldenrod. John Heinz National Wildlife Refuge, Philadelphia, PA.
White-footed woods mosquito
White-footed woods mosquito (Psorophora ferox) nectaring on goldenrod. John Heinz National Wildlife Refuge, Philadelphia, PA.
Compost flies
Compost flies (Ptecticus trivittatus) copulating. Swarthmore, PA.
Ptilodexia sp.
Ptilodexia sp. nectaring on yarrow. Crooked River National Grassland, Madras, Oregon.
Ptilodexia sp.
Ptilodexia sp. nectaring on yarrow. Crooked River National Grassland, Madras, Oregon.
Rainieria antennaepes
Rainieria antennaepes. Rose Tree Park, Media, PA.
Rainieria antennaepes
Rainieria antennaepes on a mushroom. Wawa Preserve, Media, PA.
Rainieria antennaepes
Rainieria antennaepes. Rose Tree Park, Media, PA.
Common snipe fly
Common snipe fly (Rhagio mystaceus). Mohonk Mountain House, New Paltz, NY.
Goldenrod bunch gall
Empty summer gall of Rhopalomyia solidaginis (goldenrod bunch gall). Longwood Gardens, Kennett Square, PA.
Sagebrush stem rosette gall
Stem rosette gall (possibly Rhopalomyia sp.) on Wyoming big sagebrush. Crooked River National Grassland, Madras, Oregon.
Sagebrush stem rosette gall
Stem rosette gall (possibly Rhopalomyia sp.) on Wyoming big sagebrush. Crooked River National Grassland, Madras, Oregon.
Sagebrush stem rosette gall
Stem rosette gall (possibly Rhopalomyia sp.) on Wyoming big sagebrush. Crooked River National Grassland, Madras, Oregon.
Sagebrush stem rosette gall
Stem rosette gall (possibly Rhopalomyia sp.) on Wyoming big sagebrush. Crooked River National Grassland, Madras, Oregon.
Sagebrush stem rosette gall
Stem rosette gall (possibly Rhopalomyia sp.) on Wyoming big sagebrush. Crooked River National Grassland, Madras, Oregon.
Rhopalomyia
Rhopalomyia sp. on sagebrush. Chimney Rock, Prineville, OR.
Rivellia flavimana
Rivellia flavimana eating bird droppings. Hildacy Preserve, Media, PA.
Rivellia flavimana
Rivellia flavimana eating bird droppings. Hildacy Preserve, Media, PA.
Bald-faced hornet fly
Bald-faced hornet fly (Spilomyia fusca. Mohonk Mountain House, New Paltz, NY.
Sunflower maggot fly
Sunflower maggot fly (Strauzia longipennis). Swarthmore, PA.
Sunflower maggot flies
Copulating sunflower maggot flies (Strauzia longipennis). Swarthmore, PA.
Sylvicola alternatus (female)
Sylvicola alternatus. Swarthmore, PA.
Stilt-legged flies
Copulating pair of stilt-legged flies (Taeniaptera trivittata). John Heinz National Wildlife Refuge, Philadelphia, PA.
Cypress twig gall midge
Cypress twig gall midge (Taxodiomyia cupressiananassa) on bald cypress (Taxodium distichum). Pioneer State Park, Zolfo Springs, FL.
Cypress twig gall midge
Cypress twig gall midge (Taxodiomyia cupressiananassa). Swarthmore, PA.
Giant crane fly
Giant crane fly (Tipula abdominalis). Binky Lee Preserve, Chester Springs, PA.
Margined calligrapher
Margined calligrapher (Toxomerus marginatus). Swarthmore, PA.
Swift feather-legged fly
Swift feather-legged fly (Trichopoda pennipes). ID tentative. Taylor Memorial Arboretum. Wallingford, PA.
Swift feather-legged fly
Swift feather-legged fly (Trichopoda pennipes). Longwood Gardens, Kennett Square, PA.
Grape tumid gallmaker
Grape tumid gallmaker (Vitisiella brevicauda). Rose Tree Park, Media, PA.
Grape tumid gallmaker
Grape tumid gallmaker (Vitisiella brevicauda). Rose Tree Park, Media, PA.
Grape tumid gallmaker
Grape tumid gallmaker (Vitisiella brevicauda). Rushton Woods Preserve, Willistown, PA.
Walshmoyia sp.
Walshmoyia sp. galls on western juniper. This is an undescribed species. Russo refers to it is as sp. B. Crooked River National Grassland, Madras, Oregon.
Walshomyia sp.
Walshmoyia sp. galls on western juniper. This is an undescribed species. Russo refers to it is as sp. B. Crooked River National Grassland, Madras, Oregon.
Walshomyia sp.
Walshmoyia sp. galls on western juniper. This is an undescribed species. Russo refers to it is as sp. B. Crooked River National Grassland, Madras, Oregon.
Walshomyia sp.
Walshmoyia sp. galls on western juniper. This is an undescribed species. Russo refers to it is as sp. B. Crooked River National Grassland, Madras, Oregon.
Walshomyia sp.
Walshmoyia sp. galls on western juniper. This is an undescribed species. Russo refers to it is as sp. B. Crooked River National Grassland, Madras, Oregon.
Juniper urn gall midge
Juniper urn gall midge (Walshomyia juniperina). Crooked River National Grassland, Madras, OR.
Juniper urn gall midge
Juniper urn gall midge (Walshomyia juniperina). Crooked River National Grassland, Madras, OR.
Juniper urn gall midge
Juniper urn gall midge (Walshomyia juniperina). Crooked River National Grassland, Madras, OR.
Tiger bee fly
Tiger bee fly (Xenox tigrinus). Swarthmore, PA.
Tiger bee fly
Tiger bee fly (Xenox tigrinus). Swarthmore, PA.