DA8YP0G0NINAE 



ROBBER FLIES OF THE WORLD 



67 



short and broad, the short anterior crossvein enters the 

 middle of the discal cell. Anal cell very widely open ; 

 alula narrow and ambient vein complete. Wing tinged 

 with brown and wholly villose. 



Abdomen: The abdomen is comparatively wide, the 

 base is perhaps not quite as wide as the mesonotum ; the 

 third tergite is as wide as the mesonotum. The first 

 abdominal segment is quite short, and membranous, 

 except narrowly along the sides where there is a 

 strip of chitin. Beyond the third tergite the abdomen 

 is slightly narrowed and ends obtusely. The surface 

 is gently convex, almost flattened in the middle. There 

 is a prominent, transverse crease just before the 

 middle of the second segment, deceptively appearing 

 as the margin of the segment ; and there are more shal- 

 low constrictions subbasally on the third, fourth, and 

 fifth segments and the posterior margins of the second 

 and third bear minute, fluted impressions. Males with 

 7 tergites, the seventh half as long as the sixth, the third 

 little more than half as long as the second. The eighth 

 is totally concealed beneath the seventh. Male termi- 

 nalia recessive and the basally, at least partially split 

 epandrium is largely tucked beneath the last tergite 

 and not apparent from above. The tiny proctiger is 

 enclosed within the V-shaped cleft. I cannot deter- 

 mine if the medial cleft reaches the base. Remainder 

 of terminalia rather deeply recessed within this epan- 

 drial hood, a condition reminiscent of Stichopogon 

 Loew. 



Distribution : Ethiopian : Margaritola mirabilis Hull 

 (1958). 



Genus Haplopogon Engel 



Figuees 38, 429, 863, 872, 1638, 1660, 1996, 2001 



Haplopogon Engel, Die Fliegen der Palaearktischen Region, 

 pt. 24, Asilidae, p. 409, 1930. Type of genus: Haplopogon 

 nudus Engel, 1930, by original designation. 



Minute, pale pollinose flies of blackish groimd 

 color. The wings are broad and all the cells, except 

 the anal cell, are open, and the head is much less wide 

 than in Holcocephala Jaennicke. It shares with that 

 genus the anteriorly situated, prominent ocellarium 

 and the deeply excavated postvertex and supraocciput. 

 Length 4 to 6 mm. 



Head, lateral aspect : The head and eye strongly con- 

 vex anteriorly, the length medium, the eye likewise 

 convex posteriorly, especially below and with the 

 medial facets greatly enlarged. Face convex and re- 

 treating, scarcely visible in profile, except slightly be- 

 low, and with deep lateral subgenal creases or recessed 

 pockets on each side of the lower eye margin. The 

 occiput is short, both above and below, pollinose, with 

 fine, erect, scanty pile. The proboscis is small, cylin- 

 drical, short, blunt at apex, directed downward and 

 not projecting beyond the face; at the apex is a row 

 of ventrolateral stiff haire and some long hairs at the 

 base. Palpus clearly of two segments, the first hemi- 

 cylindrical and excavated, with ventral hair, the sec- 



ond a little longer and cylindrical with numerous, stiff, 

 bristly hairs. Antenna attached at or just above the 

 middle of the head in profile. It is small, compara- 

 tively slender, but shorter than the head length; the 

 first two segments are quite short, subequal, with the 

 second the widest and beadlike. The third segment 

 is slightly attenuate distally, carrying a short micro- 

 segment followed by a longer, strongly attenuate, spine- 

 tipped microsegment. Third segment with some quite 

 long, conspicuous, dorsal bristles or bristly hairs that 

 are much shorter in the type of genus than in American 

 species. 



Head, anterior aspect: The face is about one-fourth 

 the head width, slightly divergent below, thickly pu- 

 bescent and with fine, moderately long, scattered pile 

 over all of the face except the portion immediately 

 beneath the antenna. Bristles absent. Subepistomal 

 area horizontal, excavated medially and pollinose lat- 

 erally. Front short, pollinose, without pile or bristles. 

 The ocellar protuberance is large, high, prominent, with 

 vertical sides, set well forward and leaving the con- 

 spicuous ocelli fully visible in profile. Between the 

 ocelli are several fine, bristly hairs. 



Thorax: The mesonotum is moderately high and 

 strongly convex both anteriorly and posteriorly. Sur- 

 face of mesonotum densely pollinose, for the most part 

 pale, with fine, short, scanty pile, including an acrosti- 

 cal row and dorsocentral rows and some lateral pile. 

 Bristles are virtually absent. There is a single, stiff, 

 bristly hair on the notopleuron, 5 or 6 post dorsocentral 

 bristly hairs, several even more weak ones on the post- 

 alar callosity. Scutellum convex, pollinose, with a 

 few scattered discal hairs and no bristles. Pleuron 

 uniformly pollinose unless rubbed; it has a few fine 

 hairs posteriorly on the mesopleuron, pronotal collar, 

 ventral propleuron and the metapleuron. Metanotal 

 callosity pollinose only. Slopes of the metasternum 

 pilose posteriorly, the postmetacoxal area short but 

 chitinized and the ventral metasterum prominent and 

 chitinized, without pile. 



Legs: The hind femur and the four anterior legs 

 of moderate stoutness, not in the least attenuate, densely 

 appressed pilose with a few long, bristly hairs ven- 

 trally on all of them, but no true bristles. The hind 

 tibia is densely appressed pilose with very weak bris- 

 tles or bristly hairs of which there are 7 dorsal, in- 

 cluding an apical bristle, 5 dorsolateral, including an 

 apical bristle, and 3 ventrolateral bristles. There are 

 10 bristles in the apical circlet. The anterior and 

 middle tibiae have somewhat better developed bris- 

 tles, especially the middle pair, where they are slender 

 but longer ; middle tibia with 6 anterodorsal, 6 postero- 

 dorsal, and 3 or 4 ventral bristles. Tarsi with weak 

 bristles; the basitarsi as long as the succeeding two 

 segments and the hind basitarsus as long as the next 

 three segments ; basitarsi bear a dense, erect tuft of sen- 

 sory pile. Claws sharp, pulvilli well developed; em- 

 podium short, strongly swollen at the base. 



Wings: The wings are broad, the marginal and all 

 of the posterior cells widely open, the anal cell closed 



