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So here are few more pics of the same species, but now of both sexes. I've excluded N. denticulatus, N. flavipes, N. mundus, N. nairicus, N. perplexus and N. urartorum (considering the data given in Richter's "Asilidae of Caucasus", so the only to species left are N. desertorum and N. manni.

Also I've started translating the key given in book mentioned above and the 3 species given below are all for now (sorry for non-professional translation of some terminology).

1.Neomochtherus denticulatus

Face, vertex and the posterior surface of head are covered with dense silver-white or golden-yellow dust; laterally vertex is covered with black and white hair; distance between facial gibbosity is and antennae base is a bit less, then the total length of antennae 2 basal segments; facial beard consists of white pubescences, with a mixture of several black pubescences along its upper edge; palpus black, covered with white pubescences; antennae black or dark brown; their basal segments covered in grey dust and white and black setae and pubescences; 3-d antennal segment length < two basal segments total length; arista length equals ¾ length of 3-d segment.
Mesonotum covered in yellow-greyish dust, covered with short standing black and white hair; median brown stripe reaches the posterior edge of mesonotum, and is separated with broad grey line reaching the transverse suture of mesonotum; the lateral brown stripe is divided into two spots by grey stripe crossing along the transverse suture; mesonotum hair white or with a mixture of several black pubescences.
Legs with adjacent short white and black hair and black and white setae; femur black or with posterior ventral yellow stripe; tibiae yellow, with more or less darkened apex; front tibia with very long, thin bristles; tarsus black, first segment is brownish yellow; claws black with reddish yellow base.
Wings transparent; medial transverse vein immediately behind the middle of the discoid cell.
Abdomen covered with grey dust, short adjacent white hair and white bristles; 8-th sternite of male is brownish-black, shiny, laterally covered in dust.
Hypopygium brownish-black, with white hair; both halves of the epandrium on top of the medial edge with weakly sclerotized processes, in front of the apex with a rounded lobe-like outgrowth, at the apex elongated into a long narrow process, intersecting with the symmetric process of the other half of the epandrium.
Ovipositor black and shiny; its length exceeds the length of the two preceding segments of the abdomen combined.
Body length – 7-12 mm.

2.Neomochtherus desertorum

Face, frons, vertex and the posterior surface of head covered with dense silver-greyish dust; laterally frons is covered with white hair; occiput covered with white hair; antennae basal segments reddish-yellow; 3-d antennal segment with arista dark-brown or black.
Mesonotum covered in yellow-greyish dense dust, with short white hair with a mixture of black ones; median brown stripe reaches over the posterior edge of mesonotum, but doesn’t reach scutellum; lateral and dorsomedial bristles are white; scutellum in grey dust and with thin white hair.
Legs yellow, with black and white thin hair and firm setae; apex of tibia and each tarsal segment sometimes dark brown.
Wings transparent or a bit yellowish; medial transverse vein located behind the middle of the discoid cell.
Abdomen covered with dense yellow-greyish dust, tergites with short adjacent white hair and with white bristles laterally; sternites with long white protruding hair.
Hypopygium black and shiny, with white and black hair; both halves of the epandrium on top with yellow narrow process, intersecting with the symmetric process of the other half of the epandrium.
Ovipositor black; its length exceeds the length of the two preceding segments of the abdomen combined.
Body length – 10-14 mm.
The indication of presence in the Caucasus is based on the definition of signle female and needs to be confirmed.


3.Neomochtherus flavipes

Face, frons, vertex and the posterior surface of head covered with dense yellow-whitish dust; facial beard bristles, occiput bristles and “whiskers” are white or yellow-whitish; palpus black with white hair; antennae black, its basal segment covered with black hair.
Mesonotum covered in yellow-greyish dense dust, short black hair; median brown stripe reaches over the posterior suture of pronotum, but doesn’t reach it’s hind edge; in the front half divided with wide grey line; lateral and dorsomedial bristles are yellow-whitish, sometimes with black ones; scutellum in grey dust, with 2 white bristles at the hind edge.
Legs yellow, with black thin hair and black and white firm setae; femur from the anterior transdorsal side with a longitudinal wide black band, usually not reaching their apex and base; apex of tibia and each tarsal segment is black; claws black, with red-yellowish base.
Wings transparent, a bit yellowish; medial transverse vein located behind the middle of the discoid cell.
Abdomen covered in grey dust and short adjacent hait, tergites with white lateral bristles; 1-st and 2-nd sternites with long white protruding hair; subsequent sternites bear firm bristles.
Hypopygium yello-reddish, with white and black hair; both halves of the epandrium on top without narrow processes, with white lamellar short projection.
Ovipositor brown-blackish; its length exceeds the length of the two preceding segments of the abdomen combined; 8-th tergite in the anterior third strongly convex, not squeezed laterally, brownish-red
Body length – 12-23 mm.