DASYPOGONINAB 



ROBBER FLIES OF THE WORLD 



139 



and ventrally are only poorly differentiated bristly 

 hairs or very weak bristles. Apex without spine. 

 Claws sharp, slender, bent at the apex; the pulvilli and 

 empodium well developed. 



Wings : The marginal cell is open by about half of 

 its maximum width; subcostal cell has 2 to G extra 

 crossveins. Wings broad, dark, smoky blackish in 

 males but extensively brownish orange in females. The 

 fourth posterior cell is closed with a short stalk, the 

 anal cell is narrowly open or closed in the margin. The 

 alula is large and the ambient vein complete. 



Abdomen : The abdomen is robust, slightly shorter 

 than the wing. At the base it is nearly or quite as wide 

 as the mesonotum; it is a little tapered, and on the 

 posterior half it is subcylindrical though broad and 

 stout. Sides of the first two or three tergites with 

 abundant, fine, erect pile, shorter on the third segment ; 

 remainder of pile coarse, apfiressed and setate. Bris- 

 tles are confined to the sides of the first segment, where 

 there are 7 or 8 slender bristles grading off into the 

 numerous, bristly hairs. Abdomen shining, the pollen 

 being very faint. Males with seven tergites, the sev- 

 enth half as long as the sixth ; females with eight ter- 

 gites, the eighth tergite is more than half the length of 

 the seventh. Male terminalia fully rotate, the epan- 

 drium large, obtuse, fully divided into superior for- 

 ceps. The gonopod is large but blunt, the hypandrium 

 short, obtusely triangular with a small, laterally com- 

 pressed, short, terminal process, but no lappetlike ex- 

 tension. The genital cavity is widely open, the aedea- 

 gus tubular. Females with 5 or 6 pairs of stout, sharp, 

 basally triangular spines on each of the acanthophorites. 



Distribution: Neotropical: Prolepsis lucifer Wiede- 

 mann (1S2S) [= fumiflamma Walker (1851), quad- 

 rinotata Bigot (1878), rufipennis Macquart 1838, sa- 

 tanas Wiedemann (1828)]. 



Country unknown : Prolepsis crabroniformis Schiner 

 (1867). 



Genus Dasypecus Philippi 



Fioukes 2525, 2526 



Dasypecus Philippi, Verb, zool.-bot. Ges. Wien, vol. 15, p. 692, 

 1865. Type of genus: Dasypecus heteroneurus Philippi, 

 1S65, by present designation. 



The following is Philippi's description in translation : 



Body rather wide, with depressed pile. Head strongly de- 

 veloped transversely. First antennal segment rather elongate; 

 the third segment equals the preceding, and at the same time 

 is noticeably narrowed ; the terminal style equals half the seg- 

 ment. First basal cell of wing elongate ; there are four poste- 

 rior cells, three of which are closed ; the second and third are 

 far removed from the wing margin. Legs robust, rather short 

 and densely hairy. Pulvilli present. Through its dense pile 

 and the character of the wing veins very easily distinguished. 



Distribution: Neotropical: Dasypecus heteroneurus 

 Philippi (1865); latus Philippi (1865). These flies 

 are from Chile. 



Genus Dasycyrton Philippi 



Figures 2524, 2527 



Dasycyrton Philippi, Verb, zool.-bot. Ges. Wien., vol. 15, p. 701, 

 1805. Type of genus: Dasycyrton gihbosus Philippi, 1S65, 

 by monotypy. 



The following is Philippi's description in translation : 



Head wider than the body. Front concave; mystax and 

 proboscis as in Asilidae (Asilicorum). Face not prominent. 

 first segment of antenna cylindrical and hairy, the first much 

 longer. The third segment equal to the preceding segments 

 combined, slender, cylindrical ; it terminates in a style barely 

 more slender and equal half the length of the segment. Thorax 

 strongly arched or humped and strongly compressed. Abdomen 

 compressed and sickle-like. Discal cell of wing a little widened ; 

 all posterior cells open. Tibiae with long pile but not very spiny 

 (Vbristly). 



Distribution: Neotropical: Dasycyrton gihbosus 

 Philippi (1865). From Chile. 



Genus Teratopus Loew 



Figures 114, 470, 947, 956, 1720, 1825, 1915 



Teratopus Loew, Ofvers. Svenska Vet.-Akad. Forhandl., vol. 14, 

 p. 346, 1858. Type of genus: Asilus cyaneus Fabrkius. 

 1781, by original designation. 



Flies of medium size or small, characterized by the 

 exceptionally protuberant face; the upper gibbosity 

 forms a conspicuous, swollen, liplike ledge ; also by the 

 well developed occiput, open marginal and anal cells, 

 closed fourth posterior cell. Distinguished from Goni- 

 oscelis Loew by the slender, more elongate hind femur 

 and the absence of raptorial modifications. The only 

 known species is completely and uniformly blue-black 

 in color, including wings. Related to the Stenopogon 

 Loew group, although the head is not circular. Length 

 12 to 16 mm. 



Head, lateral aspect : The ventral three-fourths of the 

 face is quite protuberant and gibbous, the upper fourth 

 nearly plane with the eye. The gibbous portion is 

 convex in both lateral and vertical profile, and the 

 upper edge of the gibbosity is exceptionally abrupt and 

 ledgelike. Eye nearly as well developed below as above. 

 Occiput thick and tumid, considerably expanded be- 

 ginning at a point approximately opposite the insertion 

 of the antenna. The pile of the occiput is abundant, 

 stiff and bristly, the upper occiput has only stiff bristles 

 irregularly disposed over the entire medial surface. 

 The proboscis is short, robust, not extending beyond the 

 face; it is directed horizontally forward, with a promi- 

 nent dorsomedial ridge ending a short distance from the 

 apex; the base below has a few stiff, long hairs; the 

 apex bears only fine, short pile ventrally and is bluntly 

 pointed. Palpus with two short segments; the first is 

 excavated, the second robust, with a large, apical pore 

 and with bristly pile ventrally. The antenna is at- 

 tached at the upper fourth of the head. Antenna 

 slender, a little shorter than the head, the first segment 

 is two times as long as the second, the second is short, 



