DASIPOGONINAB 



ROBBER FLIES OF THE WORLD 



57 



half. Claws reddish on the basal half, black apically. 

 The slender pulvilli are brown. 



Wings : The wings are light sepia brown on the ante- 

 rior half, including the first posterior cell, except the 

 posterior, apical corner of this cell. The anterior half 

 of the first basal cell is more dilntely brown ; much of 

 the dark color on the anterior border is due to the very 

 dense, brownish villi. Posterior half of wing nearly 

 hyaline with only a few scattered villi. Alula long 

 and narrow ; the ambient vein ends with the fifth pos- 

 terior cell. Anal cell closed and with a long stalk. 

 Upper anterior intercalary vein a little less than half 

 as long as the medial crossvein. 



Abdomen : The abdomen is polished black. Sides of 

 the tergites with some yellowish hairs anteriorly and 

 on the third and remaining tergites replaced postero- 

 laterally by blackish hairs ; all of this pile scanty. Dor- 

 sally on their posterior half or more the tergites have 

 some scanty, appressed, short, black, bristly pile. Ter- 

 minalia large, prominent and rotate, shining black 

 with the base of the large, superior forceps and the 

 proctiger reddish brown. The superior forceps are 

 stout, cylindrical, widest in the middle and curved 

 strongly inward toward the medial line and at the apex 

 turned a little downward ventrally. The apex is trun- 

 cate. Proctiger unusually large, long and tonguelike, 

 its ventral surface bearing a fringe of bristly, reddish 

 hairs. True dorsal surface of the superior forceps with 

 15 or more prominent, erect, long, yellowish, bristly 

 hairs and apically on the lateral surface 3 or 4 similar, 

 black hairs. Near the base of the hypandrium, which 

 is sulcate with a large, blunt, lateral process and which, 

 perhaps, includes and is fused with the gonopod not 

 otherwise evident, there is a row of 5 or 6 long, 

 conspicuous, moderately stout, black bristles on each 

 side. 



Type. Male, from Malaya; in the British Museum 

 (Natural History) . 



Genus Orrhodops Hull 



Figures 27, 431, 838, 847, 1656, 1657, 1922, 2058 



Orrhodops Hull, Rev. Brasileira Biol., vol. 18, no. 3, p. 324, 1958. 

 Type of genus : Damalis americana Curran, 1930, by original 

 designation. 



Small or medium size flies with wide but compara- 

 tively long head, narrow front, divergent face with 

 deep, lateral and ventral creases and with a strong, 

 humpedback appearance. It is related to Damalis 

 Fabricius in the type of venation, but the upper ante- 

 rior, intercalary vein is almost or quite wanting and 

 the third antennal segment is much longer and densely 

 micropubescent or pollinose. The hind femur is 

 densely pilose below and without bristles or spines. 

 Similar to Haplopogon Engel in the type of face but 

 it is readily separated by the antenna and the venation. 

 Length 8 mm. 



Head, lateral aspect: The head is rather long, es- 

 pecially below, the eye being pointed and narrow dor- 



sally, broadened and convex below. Face not or 

 scarcely visible in profile, strongly retreating below. 

 The width of the head is considerable and the medial 

 eye facets strongly enlarged but the upper occiput and 

 postvertex are only moderately excavated and flared. 

 The ocellar protuberance is high, set sufficiently forward 

 to be visible in profile. The occiput is prominent below, 

 due to the recession of the eye, and rises in elevation 

 medially on the upper portion, its pile long and fine and 

 bristles absent. Proboscis cylindrical, rather short, 

 quite blunt at apex, and not protruding beyond the face. 

 It is directed nearly downward. Palpus large, clearly 

 with 2 segments, the second clavate, not porate, with 

 slender, long bristles at the apex and ventral pile. The 

 antenna is attached at the middle of the head in profile; 

 it is quite short and much shorter than the head. First 

 2 segments short and subequal, the third conical and 

 nearly as long as the first 2 segments, its outer half 

 pubescent, its base shining with microsetae and bearing 

 at the apex a bristly style nearly as long as all 3 

 segments. 



Head, anterior aspect: The face densely pollinose and 

 also densely covered with long, fine erect pile turned 

 downward about the oral margin. Subepistoma hori- 

 zontal. The face creases are very deep, conspicuous, 

 flared outward to the eye margin. The front is long, 

 nearly plane with the eye, pollinose and not pilose. 

 Ocellar protuberance moderately high with vertical 

 sides and greatly swollen ocelli and on each side between 

 ocelli several short curved bristly hairs. 



Thorax : The thorax is high, strongly arched both an- 

 teriorly and posteriorly, with dense, fine, subappressed, 

 undifferentiated hair and also without bristles. The 

 whole mesonotal surface and the whole pleuron polli- 

 nose. Scutellum exceptionally thick and convex, with 

 fine, long, erect, bristly pile, the margin without pile or 

 bristles. On the pleuron there is abundant mesopleural, 

 propleural, and metapleural pile and a little on the 

 upper sternopleuron. Metapleuron with extremely 

 weak bristles or bristly hairs; humerus laterally ex- 

 tended beyond the mesonotum. Lateral slopes of the 

 metasternum pilose, ventral metasternum chitinized and 

 with scattered hairs. Postmetacoxal area membranous, 

 but short. Metanotal callosity pollinose only. 



Legs : The femora only moderately stout, never spin- 

 dleformed or attenuate, the anterior four legs rather 

 weak. All the femora with rather dense, coarse, 

 appressed pile and fine, long, ventral hairs, especially 

 basally. Bristles absent. Tibiae with abundant, sub- 

 appressed, coarse pile and longer, fine, bristly hairs, 

 especially dorsally, and emphasized and longer posteri- 

 orly on the anterior and middle tibiae. The middle 

 tibia has a double posterior and posteroventral fringe 

 of from 15 to 18 elements in each row and fewer ele- 

 ments dorsally and ventrally, 8 to 10 in each row. 

 Tarsi short, the basitarsi of all of the legs with sensory 

 pile. Anterior basitarsus not longer than the 2 succeed- 

 ing segments, hind basitarsus as long as the next 3 seg- 

 ments. Claws sharp, pulvilli long, empodium strongly 

 swollen at the base. 



