44 



UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



slightly curly ; it is equally abundant above and later- 

 ally and is longer ventrally and matched by and mixed 

 with equally copious tufts of similar colored pile from 

 the propleuron. The proboscis is moderately large, sub- 

 cylindrical, gently attenuate apically, with a rounded 

 point and considerable fine pile on the ventral apical 

 third and some, long, fine pile on the basal half; a high 

 dorsal ridge present. Palpus of two segments, the first 

 quite short and robust and well hidden, cylindroid and 

 unexcavated, chitinized on all sides but membranous 

 only at the short basal medial point of attachment. The 

 second segment is exceptionally long, cylindrical, with 

 obtuse, rounded, not porate apex; it is covered on all 

 sides and the apex with stout, long bristles; this seg- 

 ment is more than five times as long as the first. An- 

 tenna attached at the upper fourth of the head, long 

 and rather slender but the first two segments short. 

 The third segment is slightly and gradually narrowed 

 to its basal third at which point it slightly widens to 

 near the apex. The apex is narrowed, obliquely trun- 

 cate, with a short microsegment followed by a longer, 

 tapered, conical microsegment with a short apical spine. 

 Pile of the first antennal segment composed of long, 

 stiff, suberect, dorsal setae and a few ventral setae in 

 the middle of the segment ; second segment with a few 

 stiff, dorsal setae. 



Head, anterior aspect : Head width twice the height. 

 The face below antenna is two-fifths the head width 

 and slightly divergent below. Subepistoma large, con- 

 cave and bare. Face with pubescence only on a small 

 triangle opposite and below the antenna, otherwise bare 

 and shining with dense pile which is short dorsally 

 along the upper facial ridge. The pile becomes longer 

 below; across the epistoma it is nearly as long as the 

 proboscis. With the exception of the upper fringe of 

 short pile, these hairs become thin and strikingly flat- 

 tened apically. The face pile is directed obliquely 

 downward and the proboscis directed obliquely for- 

 ward. The front is as wide as the face, very slightly 

 widened at the vertex; it is relatively short and bare 

 with only a few fine hairs; vertex not excavated, the 

 ocellarium almost not existent, the ocelli small, the 

 intervening space with a tuft of short fine erect hair. 

 Eye facets not enlarged. 



Thorax : The thorax is shining and bare, the pleuron 

 has a faint, scarcely discernible pollen. Mesonotum 

 twice as long as high. Pile of mesonotum dense, fine 

 and suberect. Dorsocentral and acrostical bristles un- 

 differentiated, the pile above the wing, on the postalar, 

 and on scutellum long, fine, dense and tufted. Humerus 

 with abundant fine pile. Mesonotum with short, stout 

 bristles as follows : 3 notopleural, 2 supraalar, and 4 to 

 6 postalar. Scutellum thick, arched and convex, the 

 surface pollinose, with abundant, fine, erect, long pile. 

 The scutellum with 4 pairs of slender bristles. Pro- 

 pleuron with dense matted tufts of fine pile. Anterior 

 collar with about 16 pairs of stout long bristles. Mes- 

 opleuron with fine, long abundant pile; similar pile on 

 the upper sternopleuron ; scanty pile on the pteropleu- 

 ron and posthypopleuron. Metapleuron unusually 



protuberant and convex, without bristles, almost its 

 whole surface covered with dense, fine, tufted pile. 

 Metanotal callosity bullose and pollinose only. Meta- 

 sternal slopes with abundant fine pile; metasternum 

 with a few fine hairs ; the postmetacoxal area small and 

 membranous. 



Legs: The anterior and middle femora are stout 

 without being especially thickened, the hind pair more 

 slender. The hind femur bears dense, appressed setae 

 above, a copious ventral fringe of dense, fine, long pile 

 and bears 3 stout lateral bristles, 1 dorsomedial near the 

 apex. The hind tibia has the following bristles: a 

 double dorsal row (5 in each row) of relatively short, 

 stout, appressed bristles, 2 stout, long, ventral bristles 

 near the apex, and 3 or 4 lateral ; the lateral and ventral 

 bristles are almost hidden by the dense band of fine 

 erect pile placed over all surfaces except the dorsal and 

 which grows more conspicuous towards the middle; 

 apex with 8 stout bristles. Middle femur with 2 stout 

 dorsoapical posterior bristles and moderately dense pile 

 dorsally and ventrally; its tibia with a dense ventral 

 band of fine moderately long, nearly erect pile and 7 

 or 8 dorsal bristles. At the apex of the middle tibia is 

 a stout ventral lobe or medial process containing a row 

 of 4 stout, spinous setae. Anterior femur with only 

 dense, short, fine pile ventrally and posteriorly; its 

 tibia has brushes of pile similar to those of the middle 

 tibia. It has 8 or more dorsal bristles; the apex is 

 without spine. Pulvillus well developed; empodium 

 long and basally stout ; claws sharp. 



Wings : The wings are large, long, wide basally and 

 gradually tapered to a rather pointed apex. Marginal 

 cell narrowly open. The anterior branch of the third 

 vein well above the wing apex, the second submarginal 

 cell is quite narrow towards the base, and near the base is 

 a strong, basally extended spur vein. The first posterior 

 cell is narrowed apically. The upper end vein of the 

 discal cell is quite short, lower end vein long, and car- 

 ried parallel to the wing margin. Fourth posterior cell 

 and anal cell each closed and with a long stalk. The 

 second basal cell ends in 2 veins; alula large; ambient 

 vein complete. 



Abdomen : The abdomen is robust, especially toward 

 the base and as wide as the thorax, strongly tapering to 

 the apex in both sexes. Wings as long as the abdomen 

 in the female, somewhat longer in the males. In the 

 male 8 tergites are present, the eighth only one-fourth 

 as long as the seventh. Six tergites present in the 

 female, the seventh and eighth are distinctly incor- 

 porated in the ovipositor. Pile of abdomen dense, but 

 quite short and appressed over the middles of the last 

 5 tergites; the pile in longer, but still dense and dis- 

 tinctly appressed in matlike tufts on the first 3 ter- 

 gites and the sides of the remaining tergites. In some 

 species the dense mat of pile over the middle of the first 

 3 tergites is lacking, but is present in the type of genus. 

 Bristles are absent. Male terminalia comparatively 

 short, not rotate. The epandrium is developed into 

 a pair of exceptionally large, divergent, posteriorly 

 produced, rounded, arched lobes or superior forceps 



