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Staminea group

robber fly - Efferia - Efferia rapax - male robber fly - Efferia desert robber fly - Efferia - Efferia - male fly 105 - Efferia rapax - male Unknown Robber Fly - Efferia rapax Asilid - Efferia rapax - male Promachus? - Efferia varipes - male Efferia sp. - Efferia nemoralis - male
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 Staminea group
Identification
The following information is based on the modified Key to Eastern Species: (1) For info on the listed reference terms see the wing diagrams here.
1) - Furcation of the third vein distinctly before the base of the second posterior cell making the second submarginal cell long;
2) - Wings with two submarginal cells; Wing vein R4 with recurrent vein arising its junction with R5; recurrent branch short, (stump vein) ending in cell r2+3.
5) - Male abdomen usually with several segments silvery, female with tip of oviduct never divided from above. Male except in a very few cases, with one or more abdominal segments bearing long white hair parted at middle and directed outward = (stamineus group)