DASYP0G0NIN4B 



ROBBER FLIES OF THE WORLD 



99 



First tergite with some long, loose pile and with from 

 3 to 6 stout, lateral bristles laterally on this first tergite 

 only. In the male there are six tergites only, others 

 absent or completely concealed; in the female only 

 six tergites with the seventh completely concealed. 

 Male terminalia largely concealed and only visible as 

 they slightly protrude from a slit between the sixth 

 tergite and sternite. Female terminalia similarly re- 

 cessed and slightly more protrusive from these sternites 

 and tergites; ventral plate undivided. Female ter- 

 minalia simple and without spines. Epandrium stout, 

 completely cleft into short, broad superior forceps. 

 Gonopod well developed with a pair of slender, curved, 

 sharply pointed, elongate processes on each. Hypan- 

 drium small, flat, thin, short and broadly rounded. 



Distribution : Neotropical : Triclioscelis burmeisteri 

 Koeder (1900), femorata Boeder (1900), perfecta 

 Curran (1934). 



Genus Zabrops Hull 



Fioubes 58, 444, 883, 892 



Zabrops Hull, Psyche, vol. 64, no. 3, p. 90, 1957. Type of genus: 

 Triclis tagax Williston, 1884, by original designation. 



These are small flies with short, appressed pile. The 

 face is rounded and convex, the whole with dense, long, 

 bristly hairs. First posterior cell closed with a long 

 stalk, marginal cell open, second vein not recurrent. 

 From Triclis Loew it differs in the gibbous and promi- 

 nent face with numerous bristles below and little or no 

 hairs on the upper part. Third antennal segment swol- 

 len. Scutellum with numerous, long bristles. First 

 posterior cell closed and stalked. Length 11 mm. 



Head, lateral aspect : The head is of moderate length, 

 the face prominent, short immediately beneath the an- 

 tenna, rising below into a gently rounded eminence oc- 

 cupying at least three-fourths of the face. The eye 

 is plane on its posterior margin from the bottom almost 

 to the vertex, being posteriorly rounded at the top ; its 

 anterior margin is strongly convex. The occiput is 

 prominent below, due to the gradual anterior recession 

 of the eye, which begins well above the middle ; occipital 

 pile dense and long and quite fine, with 4 or 5 weak 

 bristles on each side of the upper occiput. Proboscis 

 short, robust and stout at the base and not protruding 

 beyond the face and chiefly directed forward; its apex 

 blunt and the base below on the proximal half with 

 numerous, long, stiff hairs. Palpus minute, composed 

 of 2 quite short segments, the first segment hemicylin- 

 drical and excavated, the second bearing 2 or 3 lateral, 

 1 medial and 1 or 2 apical bristles which are quite long. 

 Ventral hairs of the first segment also long and stiff. 

 The antenna is attached a little above the middle of the 

 head, nearly as long as the head ; the first segment is a 

 little longer than the second and the third segment, 

 which is swollen shortly beyond the base is, style in- 

 cluded, about as long as the first two segments. At 

 its apex this segment bears a short, stout, spoon-shaped 

 microsegment directed obliquely downward and carry- 



ing a dorsally exposed spine. The first segment has 

 ventrally near the apex a long, slender bristle and 

 several long, bristly hairs. 



Head, anterior aspect : The head is of only moderate 

 width ; face below antenna a little more than one- fourth 

 the head width, with nearly parallel sides, densely pu- 

 bescent, bearing over nearly the whole surface numer- 

 ous, long, slender, bristly hairs which extend well 

 beyond the proboscis. The front is divergent to a mod- 

 erate extent, very short in length, pollinose with an 

 orbital fringe of bristly hair. The vertex is only 

 slightly narrowed; the pollinose ocellarium is moder- 

 ately high with steeply slanted sides, bearing 4 or 5 

 pairs of long, bristly hairs. 



Thorax : The mesonotum is shining with some of the 

 anterior and lateral portion pollinose. The pile is 

 abundant, bristly and more or less appressed and un- 

 differentiated. Pronotal collar with bristly hairs only. 

 The mesonotal complement of weak bristles consists of 

 2 notopleural, 3 or 4 supraalar, 2 to 3 postalar, and 4 

 to 6 pairs on the scutellum. Pleuron with partly bare 

 areas but chiefly pollinose. There is scanty, fine pile 

 on the postventral sternopleuron, abundant pile on the 

 upper and posterior mesopleuron and propleuron. 

 Metapleuron with a vertical band of weak bristles; 

 metanotal callosity micropubescent only ; lateral slopes 

 of the metasternum pilose, ventral metasternum widely 

 chitinized with abundant, fine pile ; postmetacoxal area 

 membranous; presternum not or only slightly dissoci- 

 ated ventrolaterally. 



Legs: The legs are stout, the hind femur a little 

 swollen distally, and all the legs with dense, appressed, 

 setate pile. The hind femur bears 4 dorsolateral bris- 

 tles, 2 lateral bristles near the apex, and 2 dorsomedial 

 bristles near the apex. The ventral surface of this 

 femur and the corresponding surface of its tibia have 

 a dense brush of fine, erect pile. The femur also has a 

 few, long, bristly hairs towards the base. Hind tibia 

 with 4 dorsolateral and 3 or 4 dorsoventral bristles; 

 there may be also 1 or 2 dorsal bristles. Middle femur 

 with 1 anteroventral and 1 posterodorsal bristle. On 

 the middle tibia there is a double dorsal row of 5 or 6 

 bristles and 3 or 4 posterolateral and at least 6 postero- 

 ventral bristles or bristly hairs. Anterior femur with 

 2 small, anterodorsal and 2 posterodorsal bristles. 

 Tibial bristles moderately strong. The anterior tibia 

 rather similar to the middle tibia. Claws sharp, pul- 

 villi long, empodium long. 



Wings : The marginal cell is widely open, the second 

 vein not recurrent, the first posterior cell closed and 

 stalked. Fourth posterior cell closed with a long stalk. 

 The lower end vein of the discal cell longer than the 

 upper vein, the anal cell closed and stalked, the alula 

 small, the ambient vein complete. 



Abdomen : The abdomen is comparatively robust, the 

 first two tergites at least as wide as the mesonotum. 

 There are six tergites in the male. The pile is dense, 

 appressed, and setate and there are 6 or 7 slender bris- 

 tles on the sides of the first tergite, a patch of 6 to 8, 

 or fewer, on the sides of the second tergite, 1 or 2 or 



