DASTPOGONINAB 



ROBBER FLIES OF THE WORLD 



111 



with moderately long, scattered stiff pile; vertex shal- 

 lowly excavated, the ocellarium large but low, bearing 

 several pair of stiff anteriorly curled hairs. Eye facets 

 strongly enlarged. 



Thorax: The mesonotum and pleuron are pollinose 

 and the mesonotum nearly three times as long as high. 

 Pile of mesonotum scanty, fine, suberect and setate 

 across the middle. Acrostical and dorsocentral bristles 

 are absent or undifferentiated; humerus densely erect 

 pilose. The lateral margins have abundant, stiff, erect 

 pile and long but slender bristles, 1 notopleural, 2 su- 

 praalar, and 1 postalar. Scutellum thick and flat, the 

 outer rim slightly rounded dorsally ; the ventral edge 

 bears a fringe of 7 to 10 pairs of long, distinct but 

 quite weak bristles; upper margin and disc with 

 numerous, long, fine, erect hairs. Propleuron, includ- 

 ing the collar, densely long, fine pilose. Mesopleuron 

 anteriorly and along the posterior borders with a wide 

 band of long, dense, erect, fine pile that is continued 

 down below on the upper posterior corner of the sterno- 

 pleuron. Pteropleuron with a few fine, erect hairs. 

 Metapleuron with a vertical fanlike fringe of about 20 

 long, stiff, bristly hairs and weak bristles. Metanotal 

 slopes micropubescent only ; metasternal slopes without 

 pile. Metasternum proper with a few fine, long hairs ; 

 postmetacoxal area membranous, tegulae pubescent 

 only. 



Legs : The femora are stout ; prosternum not or only 

 slightly dissociated posteriorly. The hind femur is 

 slightly concave below, a little thicker towards the 

 middle and apex; it has dense, suberect, setate pile, a 

 rather abundant, erect, short fringe of pile below with a 

 few longer hairs submedially. There is a bristle dorso- 

 medially at the apical fourth, a dorsal bristle just be- 

 yond the middle, and 4 dorsolateral bristles confined to 

 the basal half. The hind tibia is of nearly uniform 

 width and has abundant, stiff, suberect pile ; its bristles 

 are short and weak and consist of 4 or 5 dorsal, 3 or 4 

 lateral, and apex with 5 bristles. Middle femur with 

 only dense, fine, erect pile, its tibia with equally dense, 

 shorter, subappressed pile and longer ventral fringe; 

 it has 2 short dorsal, 1 stout, short anterior just be- 

 fore the middle and 1 long, stout, posterior bristle just 

 beyond the middle. Anterior femur and tibia similar 

 to the middle pair, the anterior bristle absent. Tarsi 

 end in wide, long, spatulate pulvilli and wide flat empo- 

 dium. Claws slender, sharp and bent strongly at apex. 



Wings: The wings are broad at the base, pointed 

 apically in contrast to related genera of this tribe. 

 Marginal cell widely open, the anterior branch of the 

 third vein ends at wing apex ; the second submarginal 

 cell is strongly arched anteriorly at the base; posterior 

 cells widely open, fourth posterior cell slightly nar- 

 rowed; anal cell closed and stalked; second basal cell 

 closed with two veins and not fused beyond. Alula 

 narrow ; ambient vein complete. 



Abdomen : The abdomen is as wide as the thorax and 

 as long as the wings; basal tergites rather flattened 

 across the middles. First lateral tergite not swollen. 

 Eight tergites present in the female, the last well de- 



veloped. Pile of abdomen abundant, fine, subappressed 

 across the middles of the tergites, erect and scarcely 

 longer laterally except on the sides of the first three ter- 

 gites. All sternal pile short, fine, and erect or suberect. 

 Bristles restricted to the sides of first tergite, where 

 there are 4 or more pairs, as well as additional, bristly 

 hairs. The female terminalia show a row of 5 or more 

 long, bluntly rounded, slender, hollowed spines upon 

 the acanthophorites. Ventral plate divided a short 

 distance from the apex. 



Distribution: Palaearctic: Clinopogon maroccanus 

 Becker (1913). 



Australian: Clinopogon maritima Hardy (1934); 

 sauteri Bezzi (1910). 



I have an unidentified specimen of Clinopogon from 

 the Seychelles. 



Genus Lissoteles Bezzi 



Figures 50, 482, 933, 942 



Lissoteles Bezzi, Boll. Lab. Zool. Portici, vol. 4, p. 177, 1910. 

 Type of genus: Lissoteles licrmanni Bezzi, 1910, by original 

 designation. 



These are small black or grey flies characterized by 

 dense pale pollen and a thick mat of pile and bristles on 

 the face; the pile of face is directed downward like a 

 hood. The third antennal segment is short, oval with a 

 long, stout, naked style. Front and vertex widely di- 

 vergent. Length 9 mm. 



Head, lateral aspect : The head is long, with the face 

 short and plane with the eye margin on the upper third 

 and only moderately extended beyond the lower eye 

 margins, and nearly straight in profile. The eye is 

 strongly convex anteriorly, gently convex on the upper 

 posterior half and with exceptionally strong anterior 

 recession below which leaves a great portion of the 

 occiput exposed. The occiput is densely pollinose and 

 has equally dense long, fine, white pile. Upper occiput 

 with a transverse row on each side of 5 or 6 stout, pale 

 bristles. The proboscis is robust, bluntly pointed, di- 

 rected chiefly downward and with fine pile ventrally 

 and at the apex. Palpus composed of two segments, the 

 first short, partly fused, the second long, truncate and 

 porate, its pile restricted to 3 or 4 hairs beneath the 

 base. The antenna attached a little above the middle 

 of head, short, the first two segments subequal. The 

 third segment, is very little longer than the second, short 

 oval, and bearing a stout, slender style, polished and 

 bare, with spine at apex and its total length approxi- 

 mately the same as the length of the three segments. 



Head, anterior aspect: The head is of moderate 

 width, wider above than below ; the face below antenna 

 about one-fourth the head width and divergent below. 

 The face is densely micropubescent with a broad, me- 

 dial, widening band of somewhat matted, long, flat- 

 tened, scalelike, silvery hairs. Sides of the subepistoma 

 with fine pile. Front and vertex strongly divergent and 

 moderately excavated. The dense pubescence ends 

 transversely in a line running across the anterior edge 

 of the posterior ocelli. Pile of front abundant and 



