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Genus Acrocera

Acrocera subfasciata Westwood, 1848 - Acrocera subfasciata - female Acrocerid - Acrocera bimaculata - female Acrocerid - Acrocera bimaculata - female Small-headed Fly - Acrocera unguiculata - female Acrocera sp. - Acrocera melanderi - female Acrocera obsoleta I think. - Acrocera obsoleta - male Unknown Acroceridae - Acrocera Unknown Acroceridae - Acrocera
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Family Acroceridae (Small-headed Flies)
Genus Acrocera
Synonyms and other taxonomic changes
Paracrocera Mik 1886
Explanation of Names
Acrocera Meigen 1803
refers to location of antennae at the top of the head
16 species in our area(1):
arizonensis Cole 1919
bakeri Coquillet 1904
bimaculata Loew 1866
bulla Westwood 1848
convexa Cole 1919
fasciata Wiedemann 1830
flaveola Sabrosky 1944
fumipennis Westwood 1848
melanderi Cole 1919
melanogaster Schlinger 1961
nigrina Westwood 1848
obsoleta Wulp 1867
orbicula (Fabricius) 1787
stansburyi Johnson 1923
subfasciata Westwood 1848
unguiculata Westwood 1848
Antennae are attached near the top of the very small head. Eyes cover much of the head, touch along most their length in both sexes, and lack hair. Mouthparts vestigial or absent. Thorax large, globular, black in most species. Legs typically yellowish, femora may be darkened. Abdomen large, balloon-like, with black and yellow-orange markings (the latter sometimes reduced or absent).
Keys to nearctic species in(2)(3)(4)
Habitus drawings of various species: Pl. XI-XIV in(2) (explanation of plates here)
The abdomen of a male ends bluntly in a fairly large subglobular structure (cf. Fig. 27 of Cole(2)(1919)); the female adbdomen ends in an elongate tapered ovipositor well illustrated by Fig. 32a.
Print References
Cole F.R. (1923) Notes on the dipterous family Cyrtidae. Psyche 30: 46-48. (Full text)
Johnson C.W. (1915) Notes on the species of the genus Acrocera. Psyche 22: 198-203 (Read online at BHL or download PDF)
Johnson C.W. (1923) New species of North American Cyrtidae. Psyche 30: 49-51 (Full Text)
Works Cited
1.A Catalog of the Diptera of America North of Mexico
Alan Stone, et al. 1965. United States Department of Agriculture.
2.The dipterous family Cyrtidae in North America
Cole F.R. 1919. Trans. Am. Entomol. Soc. 45: 1-79.
3.A further contribution to the classification of the North American spider parasites of the family Acroceratidae (Diptera)
Sabrosky C.W. 1948. Am. Midl. Nat. 39: 382-430.
4.A revision of the American spider parasites of the genera Ogcodes and Acrocera (Diptera, Acroceridae)
Sabrosky C.W. 1944. Am. Midl. Nat. 31: 385-413.