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Albibarbis group

Robber fly #2 - Efferia Robber Flies ID Request - Efferia albibarbis - male - female MN July - Efferia albibarbis - male Asilidae, probably Efferia female - Efferia albibarbis - female Robber Fly - Efferia Efferia bicolor? - Efferia duncani - male Robberfly Efferia species ( E. albibarbis ?) - Efferia albibarbis - male Robber Fly with prey - Efferia albibarbis - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Asilidae (Robber Flies)
Subfamily Asilinae
Genus Efferia
No Taxon Albibarbis group
Synonyms and other taxonomic changes
Albibarbefferia Artigas & Papavero 1997 (sometimes treated as genus(1))
Numbers
10 spp. in our area, 20 total(1)
Identification
Distinctive in the east but many species in the west and Texas regions. Note the number of silvery segments.

The following information is based on the modified Key to Eastern Species: (2) For info on the listed reference terms see the wing diagrams here.
1) - Furcation of third vein opposite or beyond base of second posterior cell;
18) - Posterior branch of third vein (R5) curved forward meeting the costa plainly before the apex of wing;
23) - Mesothorax broadly rounded above and without a conspicuous crest of hairs;
28) - Mesothorax with very short hair anteriorly, a few rather prominent bristles posteriorly; scutellum with short hair on disk and usually with not more than half a dozen bristles on margin;
30) - Male abdomen without ventral prominences = (Albibarbefferia/barbatus group)

Examples:
Efferia albibarbis
Efferia tagax
Range
2 spp. transcontinental (E. albibarbis widespread, E. leucocoma southern, MS-CA), other spp. such as E. bicolor and E. duncani are southwestern(1)