ROBBER FLIES OF THE WORLD 



511 



thick ; one is black and one is yellow. There were prob- 

 ably additional bristles present and there may have 

 been a few slender elements anteriorly, as on Walker's 

 type specimen there is some slight indication of scars 

 to which they might have been attached. Humerus 

 with only 2 or 3 fine hairs, the lateral mesonotum also 

 with very little pile, 2 fine, bristly hairs in front of the 

 suture and 5 in front of the postalar. There are 2 quite 

 stout notopleural bristles of moderate length, 1 black 

 and 1 yellow ; and 1 long, yellow, stout, postsupraalar 

 bristle ; 1 stout, yellow postalar posteriorly ; and 1 fine, 

 anterior, bristly hair. The scutellum bears a single pair 

 of stout, long, yellow bristles. Scutellum moderately 

 thick and convex, pubescent with a distinct impressed 

 rim and a deep, complete basal crease. Mesopleuron, 

 pteropleuron, and h3T3opleuron with micropubescence 

 only; metapleuron with a vertical row of 6 moderately 

 long, yellowish, slender bristles. Metanotal slopes with- 

 out pile. Lateral metasternum with pile. Postmeta- 

 coxal area membranous. Tegula pubescent only. 



Legs : The liind femur is distinctly though slightly 

 thickened on the outer half, again narrowed at the apex. 

 It has short, appressed pile. The type of genus bears 

 on the hind femur the following complement of stout 

 bristles : 1 quite stout, rather long subapical dorsolateral 

 and 1 dorsomedial and with 3 longer, more slender ven- 

 tral bristles which are yellow ; also 1 short, lateral at 

 the middle, 2 ventrolateral, 1 near the apex, and 1 be- 

 fore the middle. The hind tibia has 1 dorsomedial 

 middle bristle; 2 strong, dorsolateral elements, 1 quite 

 basal, the other placed at the outer fourth; 2 ventral 

 bristles of which 1 is very weak, short, placed at the 

 middle and 1 is longer and near the apex ; 2 quite strong, 

 long, ventral, apical and 2 shorter dorsal; 1 longer 

 lateral bristle. The middle femur has 1 strong, long, 

 anterodorsal bristle at outer fourth, 1 weak bristle pos- 

 teriorly at apex. Middle tibia with 2 long, strong, 

 oblique, ventral elements situated beyond the middle 

 and 2 posterior, one above the other near the apex and 

 1 weak bristle at the basal third. Anterior femur 

 rather distinctly thickened through the middle, a little 

 compressed laterally,with 3 or 4 long, pale bristles ven- 

 trally before the middle. Anterior tibia with 2 short, 

 oblique, appressed, dorsal bristles in the middle and 2 

 considerably longer posterior elements at the middle 

 and at the outer fourth. The apex bears 2 dorsal, 1 

 posterior, 1 long anterior and 2 long ventral bristles, 

 with 2 shorter ones lying between. Claws rather long, 

 moderately sharp, curved mostly at the apex ; pulvilli 

 flat, thin, almost as long as claw ; the empodium long 

 and stiff. 



"Wings : The marginal cell closed with a long stalk. 

 The anterior branch of the tliird vein ends at the wing 

 apex, the posterior branch shortly behind the apex. 

 The second submarginal cell is expanded gradually both 

 above and below the third vein; fourth posterior cell 

 closed with a long stalk. Middle end vein of the second 



basal cell very short. Anal cell closed with a short 

 stalk ; ambient vehi complete. 



Abdomen : The abdomen is cylindroid and strongly 

 tapered, the middles of the first three or four tergites 

 are somewhat flattened. Posterior lateral corners of 

 first tergite with 2 or 3 long, slender, yellowish bristles; 

 succeeding tergites with a single, shorter, reddish yel- 

 low bristle in the posterior corners and a few short, stiff 

 yellow hairs along the lateral margin; dorsal pile 

 scanty, appressed and yellowish. First sternite apilose ; 

 remainder with scattered, fine, long, bristly hairs. Ovi- 

 positor very strongly compressed laterally. The first 

 tergite is a fifth as long as the second one. Seven ter- 

 gites in the female, the eighth and beyond incorporated 

 in the ovipositor. The ovipositor is quite long, as long 

 as the three preceding tergites. 



The only material seen was "Walker's unique type of 

 Asilus mucius. 



Distribution : Neotropical : Leptoharpacticus mudm 

 "Walker (1849). 



Genus Leinendera Carrera 



Figures 379, 797, 1400, 1409, 2419, 2420 



Leinendera Carrera, Papeis Avulsos Dep. Zool., Sao Paulo, vol. 

 5, p. 184, 1945. Type of genus : Leinendera rubra Carrera, 

 1945, by original designation. 



Medium size, slender flies related to Lycomya Bigot. 

 It is separated by the very narrow face, the narrow 

 second submarginal cell, the plane face and the greatly 

 reduced pile of the mesonotum, which is strongly dif- 

 ferentiated anteriorly. Length 17 to 20 mm. 



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

 the face quite short, plane with the eye on the upper 

 half, except for a small protuberant portion inunedi- 

 ately below the antenna. The face below is visible, 

 chiefly because of the recession of the eye and the 

 whole surface of the face is almost plane, and the 

 cheeks are extensive below. The occiput is very short 

 and scarcely visible, except to a slight extent along 

 the middle of the eye. Its pile is scanty and fine ven- 

 traUy with stiff, bristly hairs beginning at the lower 

 third and replaced by moderately stout bristles, only 

 near the vertex. There are 4 pairs of such bristles be- 

 hind the upper eye corners. Proboscis comparatively 

 slender with moderately swollen base and extended only 

 a little beyond the face. The apex is bluntly pointed 

 and slightly attenuate with short, bristly hairs, and 

 there are only 4 or 5 hairs on each side of the base. 

 From the dorsal aspect the proboscis is a little broad- 

 ened but not as conspicuously as in Lycomya. Palpus 

 of one segment, but with a distinct shelflike trace of 

 the basal segment ; it bears stiff hairs ; there are 3 very 

 slender bristles at the apex. The antenna is attached 

 at the upper fourth of the head and is slender and 

 elongate. The first two segments are comparatively 



