DASVPOGONINAB 



ROBBER FLIES OF THE "WORLD 



151 



pleuron all with abundant, extremely delicate, quite 

 long, erect pile. Hypopleuron with long pubescence. 



Legs: The hind femur quite stout, slightly narrowed 

 at apex and base and densely long, appressed pilose 

 and with extremely long, stout, black bristles. The 

 bristles consist of 5 lateral from the basal fourth to the 

 apical fourth, the last element doubled, and with a 

 shorter bristle beyond near the apex ; also an irregular, 

 partly doubled anteroventral row of 10, a pair at the 

 extreme apex dorsally, the lateral one doubled, the 

 medial one doubled or tripled, besides a pair at the 

 subapex and 1 medioventrally at the apical fifth. The 

 lateral and medial surfaces bear extremely long, fine 

 hairs in rows at different levels which more or less radi- 

 ate outwardly; these hairs are especially numerous 

 medially, and on this surface some of the hairs are more 

 than half as long as the length of the femur. Hind 

 tibia similarly pilose and similarly beset with very long, 

 stout, curved, oblique, black bristles which consist of: 

 4 dorsolateral, 5 ventrolateral, 4 true dorsal, and 2 ap- 

 pressed medial ones near the middle. Apex with 

 especially long, stout bristles below. The middle femur 

 bears 3 very long, stout bristles below. The middle 

 femur bears 3 very long, stout bristles placed pos- 

 teriorly and irregularly near the middle; 2 dorsal and 



2 dorsoposteriorly at the apical fourth, together with 

 an irregular patch of 7 anterior bristles centered around 

 the middle of the femur. Middle tibia with 4 long, 

 stout, posterior, 4 dorsal and 4 strongly oblique ventral, 

 and 5 oblique anterior bristles. 



Anterior femur with only a single posterior bristle 

 beyond the middle but with extremely abundant, long, 

 fine pile, especially below. Anterior tibia with a double 

 dorsal row, each row with 8 elements and with a still 

 longer double posterior row containing 4 posterior and 



3 posteroventral bristles. The apex of the anterior 

 tibia has 2 posterior, 2 dorsal, 1 anterior, 4 ventral 

 bristles, all extremely long. The basitarsus is rather 

 short, nearly as long as the next 2 segments and bears 

 extremely long apical and posterobasal bristles. An- 

 terior tibia without spine. Claws exceptionally long, 

 stout, sharp; pulvilli thin, with rounded apex; em- 

 podium long, bladelike, swollen at the base, as long as 

 the pulvilli. 



"Wings : The marginal cell open but narrowed ; fourth 

 posterior cell closed with a long stalk; the end vein of 

 the fourth posterior cell and lower end vein of discal 

 cell nearly aligned, as in Bathypogon Loew. Anal cell 

 open. Alula present, ambient vein complete. 



Abdomen: The abdomen is subcylindrical, slightly 

 tapering, the sides of the second tergite are only slightly 

 protruding and bear dense, long, fine pile and 2 stout, 

 long bristles. Sides of the remaining tergites only with 

 long, fine pile, growing shorter beyond the third ter- 

 gite. The first tergite is about one-third as long as 

 second. In females 8 tergites are visible; the last 

 is half as long as the seventh and is shining instead of 

 pubescent. Female terminalia with 6 pairs of black 

 spines. No males available. 



Only one species and found in Chile. 



535914— 63— pt. I- 



Genus Zabrotica Hull 



Figures 123, 464, 1723, 1769, 1919 



Zabrotica Hull, Proc. Ent Soc. Washington, vol. CO, p. 253, 

 1958. Type of genus: Zabrotica clarlcei Hull, 1958, by 

 original designation. 



Comparatively small flies, which are sparsely pilose, 

 strongly pollinose and dark in color. The face is 

 moderately protuberant and convex with many long 

 bristles situated down the middle. The acrostical and 

 dorsocentral bristles of the mesonotum are especially 

 large. Abdomen cylindroid and slightly tapered. Re- 

 lated to Hypenetes Loew, which it suggests in appear- 

 ance and distinguished by the third antennal segment, 

 which is swollen from the base to the middle and only 

 slightly narrowed apically. Length 12 nun. 



Head, lateral aspect : The head is comparatively long. 

 Face moderately protuberant and convex but the pro- 

 tuberance ends a short distance below the antenna. 

 The eye is only slightly recessive anteroventrally, oval 

 on the anterior half and not flattened in the middle. 

 The occiput is prominent in the middle and slightly 

 more prominent below, obliterated only near the vertex. 

 Pile of occiput scanty and stiff, bristly in the middle, 

 longer and fine and crinkled below but never especially 

 dense. The upper occiput bears 10 to 12 pairs of 

 rather short, slightly curved, stout bristles, the dorsal 

 elements pale. The proboscis is short, directed ob- 

 liquely forward and a little downward, laterally com- 

 pressed with prominent, thinned medial ridge; the base 

 is not swollen, the apex gently tapers to a blunt point 

 with scanty, fine pile at the apex and with some long, 

 fine hairs ventrally on the basal half and 2 or 3 hairs 

 laterally. The palpus is clearly of two segments; first 

 segment excavated, second segment porate. The palpus 

 is of average size and it bears stiff, bristly pile of no 

 great length. The antenna is attached at a level cor- 

 responding to two-sevenths of the head height from the 

 vertex. The antenna is of moderate length and thick- 

 ness: the first segment barely longer than the second. 

 The third segment is slightly longer than the first two 

 combined, a little wider beyond the middle, slightly 

 tapered towards the apex and bears two microsegments ; 

 the first very short and not readily distinguished, the 

 second three times as long, with a minute, sharp, basally 

 thickened spine. First segment with 8 to 10 long, stiff 

 hairs ventrally, and 7 laterally and dorsally. Second 

 segment with 3 unusually long, quite stout, ventral, 

 subapical bristles. Third segment with 5 dorsal setae. 



Head, anterior aspect : The face below the antenna is 

 two-sevenths of the head width and slightly divergent 

 below. The subepistomal area is short, oblique with 

 the palpus filling the greater part of this space. The 

 face cover consists of dense, pale, appressed micro- 

 pubescence. There is no simple pile but the middle of 

 the face bears a vertical band of numerous, long, stout, 

 anteriorly directed bristles; the bristles on each side 

 of this medial row extend slightly outward laterally, 

 the medial elements pale, the lateral elements black. 



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