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TaxonomyBrowse
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Species Physoconops bulbirostris

Thick-headed Fly - Physoconops bulbirostris - female Wasp or a fly? - Physoconops bulbirostris - male Thick-headed fly - Physoconops bulbirostris - female Thick-headed fly - Physoconops bulbirostris - female Conopidae ID request - Physoconops bulbirostris - female Physoconops bulbirostris - male Physoconops bulbirostris - male conopid - Physoconops bulbirostris - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Acalyptratae")
Superfamily Sciomyzoidea
Family Conopidae (Thick-headed Flies)
Subfamily Conopinae
Genus Physoconops
No Taxon (Subgenus Pachyconops)
Species bulbirostris (Physoconops bulbirostris)
Synonyms and other taxonomic changes
Conops bulbirostris Loew 1853 (see also Kröber 1915, and Williston 1882)
Explanation of Names
From Latin: bulbi = thickened, bulbous; rostr- = beak, rostrum
In his original description, Loew remarked that the proboscis was noticeably thickened at base. In morphological terminology of Diptera, the word "rostrum" refers to the basal portion of the proboscis.
Identification
Head: Frons entirely black; cheeks brown-to-black (at least in posterior portion); face, including facial grooves, whitish; proboscis fairly long (reaching end of 2nd antennal segment).
Thorax: Black; two fairly large white, rectangular, pollinose spots at anterior corners of dorsum (i.e. "humeral dashes"); pollinose pleural stripe occupies lower half of pleura only (terminates at suture between upper and lower halves).
Abdomen: Black, with narrow posterior white pollinose bands. In females, theca quite large.
Range
Indiana to New Jersey, s. to Texas and Florida (1)
Remarks
Both P. bulbirostris and (the dark variant of) P. excisus are mostly black and have females with very large thecas. However, Camras (1955) emphasizes (on pg. 171) that P. excisus has a "very distinct uninterrupted postvertical pollinose stripe connecting the postorbitals" (i.e running along the rear edge of the upper half of the head)...whereas in P. bulbirostris, the corresponding stripe is ("usually") interrupted in the middle or absent.
Print References
Camras, Sidney (1955), "A Review of the New World Flies of the Genus Conops and Allies (Diptera: Conopidae)", Proc. U. S. Nat. Mus., Vol. 105, pp. 155-187 (Full Text)
Internet References
Curated image from Barcode Of Life Database web site.
Works Cited
1.A Catalog of the Diptera of America North of Mexico
Alan Stone, et al. 1965. United States Department of Agriculture.