DASYPOGONINAE 



ROBBER FLIES OF THE WORLD 



85 



ending at the anal cell. The anterior crossvein enters 

 the discal cell shortly before the middle; entire wing 

 villose. 



Abdomen : The abdomen is robust, abnost as wide as 

 the thorax, wider than the mesonotum and rather 

 strongly convex on the tergites except on the first one; 

 the surface is thickly micropunctate. Males with six 

 tergites only, the sixth almost as long as the fifth, its 

 sides a little narrowed and compressed laterally but its 

 dorsal aspect straight and therefore not cupped al- 

 though the abdomen is slightly convex and drooping as 

 a whole. Sixth tergite rather triangular in lateral 

 profile, its ventral apical margin convex. Pile of the 

 abdomen dense but quite short and appressed, with some 

 short, more erect pile laterally on the first tergite. 

 Sides of first tergite with a pair of short, stout bristles; 

 remaining tergites without bristles. 



Distribution: Ethiopian: Gerrolasius meridionalis 

 Hermann (1920). 



Genus Triclis Loew 



Figures 40, 439, 911, 920, 1675, 1941 



Triclis Loew, Bemerkungen iiber die Familien Asiliden, p. 17, 



1851. Type of genus : Dasypogon olivaceus Loew, 1S51, by 



monotypy. 

 Oastrichclius Rondani, LMpterologiae italica prodromus, vol. 1, 



p. 156, 1856. Type of genus : Oastrichelius halictivorus 



Rondani, by original designation. 

 Gastricheihis Bigot, Ann. Soc. Ent. France, ser. 3, vol. 5, pp. 



535, 1857, lapsus. 



Flies of small or medium size, characterized by the 

 short proboscis, the short, nearly straight face bearing 

 in the type of genus abundant, long, fine pile without 

 bristles. The front is short, the vertex deeply exca- 

 vated, the ocellarium prominent, with dense, long pile 

 only. The thorax and abdomen are densely pilose, the 

 latter with appressed pile. The apex of the marginal 

 cell is reduced and the first posterior cell considerably 

 narrowed. Length 10 to 25 mm. 



Head, lateral aspect: The length of the head is a 

 little more than half the height. The face is short but 

 almost equally produced above and below and nearly 

 straight in profile. Eye of moderate length, strongly 

 convex anteriorly, but posteriorly recessive below to a 

 moderate extent. The occiput is short, except medially, 

 but becomes quite prominent ventrally, and only part 

 of this expansion is due to the eye recession. Pile of 

 occiput abundant, long, fine, crinkled throughout the 

 full length of the occiput; bristles absent. The pro- 

 boscis is short, slightly longer than the face, subcylin- 

 drical or a little flattened laterally with moderate, me- 

 dial ridge; the apex is bluntly rounded with a few, 

 fine hairs. The base is not or but little swollen and has 

 a few, fine, long hairs below. 



Head, anterior aspect : The face below antenna a little 

 more than one- fourth the width of head ; the subepisto- 

 mal area is short, small, horizontal. The face is pubes- 

 cent and bears everywhere, except narrowly along the 

 eye margin, abundant, long, fine, delicate pile; bristles 



absent. The antenna is attached at the upper fourth 

 and is of moderate length, the first segment swollen, 

 slightly longer than the narrow second segment. The 

 third segment is a little wider than the second, grad- 

 ually widened from base to the middle and then nar- 

 rowed to the apex, and bears a moderately long, micro- 

 segment open apically and carrying a spine. Pile of the 

 first segment coarse and long and abundant on all sides 

 except the medial. On the second segment there are 

 5 or 6 short, stiff, bristly hairs dorsally and ventrally. 

 The front is exceptionally short, shining or thinly pol- 

 linose, the vertex deeply excavated with unusually large 

 ocellar protuberance ; anterior ocellus large, set low and 

 with numerous, long, stiff, bristly hairs over the middle 

 area ; bristles absent. Anterior facets strongly enlarged. 



Thorax : Mesonotum shining or at most thinly pol- 

 linose and with micropubescence laterally and over the 

 whole pleuron. The pile of the mesonotum is dense, 

 rather fine, nearly erect, and without differentiated 

 acrostical bristles or hairs. In the type of genus the 

 following complement of only moderately long or stout 

 lateral bristles present : no humeral, 3 or 4 notopleural, 

 2 or 3 supraalar, 2 or 3 postalar, no scutellar bristles. 

 Scutellum convex, rather thick with impressed rim; it 

 has dense, long, more or less erect pile on the surface, 

 appressed posteriorly, and with fine, shorter pile on 

 the margin. The propleuron everywhere densely long 

 pilose ; bristles absent on the collar. Anterior and upper 

 sternopleuron, pteropleuron, the whole of the mesopleu- 

 ron, except the lower anterior corner, the posterior 

 hypopleuron and the metapleuron with extensive tufts 

 of dense, long, slender, crinkled pile; bristles absent. 

 Metanotal slopes micropubescent only; lateral and 

 ventral metasternum densely long pilose, the latter 

 chitinized and isolated, the postmetacoxal area mem- 

 branous. Tegula with a few bristles. 



Legs: All the femora of moderate thickness, with 

 abundant, dense, rather long pile which is appressed 

 laterally and dorsally on the apical half; the ventral 

 pile is abundant and erect. The hind tibia is stout at 

 the base, gradually swollen at the apex, with nearly 

 erect, dense, ventral fringe but with a brush of setae 

 only at the immediate apex, where it is ranked. The 

 following complement of bristles present: hind femur 

 with 2 rather short, delicate bristles ventrally, 1 near 

 the middle, 1 at the outer fourth, a slender, dorsolateral 

 subapical bristle, and a similar medial bristle. This 

 tibia has 3 quite fine dorsal and 3 stout, oblique, ven- 

 trolateral bristles on the outer third. Middle femur 

 with 3 stout bristles anteriorly, one in the middle, a 

 close pair subapically, a slender weak bristle posteriorly 

 at the apex ; its tibia with 3 short dorsal, 2 short and 2 

 longer anterodorsal, 5 longer posterior, 3 long ventral 

 and a fourth at the apex, besides 3 long posteroventral 

 bristles. Anterior femur with 1 stout bristle anteriorly 

 on the outer third, its tibia with 4 or 5 short anterior 

 dorsal, 5 dorsal, 5 or 6 posterior, and 4 long postero- 

 ventral bristles ; apex without spine. Tarsi rather short, 

 ending in stout, sharp claws, long pulvilli and blade-like 

 empodium. 



