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