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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



longer dorsal bristles in 3 or more rows which arise 

 behind the vertex. Proboscis of medium length, rather 

 sharply pointed apically but with the lower surface 

 plane, the dorsal surface curved to the apical point, 

 The proboscis is somewhat compressed laterally with 

 a conspicuous, dorsal, medial ridge and a number of 

 long, stiff hairs ventrally near the base besides fine, 

 long pile at the immediate apex. Palpus of two seg- 

 ments, the first segment excavated, with numerous, 

 long, stiff, ventral hairs; the second segment is short 

 and stout without apical pore and with several stout 

 bristles at the apex and on all sides. The antenna is 

 attached just above the middle of the head in profile ; 

 the first segment is a little longer than the second. The 

 third segment is iy 2 times as long as the combined 

 length of the first two; it is quite strongly dilated dor- 

 soventrally in the middle, tapered and narrowed both 

 basally and apically; the narrowed apex is truncate 

 and carries a short, distinct, visible spine; first seg- 

 ment and the second with 3 or 4 stout, rather short, 

 appressed, bristly hairs dorsally; ventrally the first 

 segment has 3 stout, extremely long bristles, longer 

 than the combined length of the first 2 segments and 

 also 2 short bristles, second with 1 or 2 long bristles. 



Head, anterior aspect : The face below antenna one- 

 fourth the head width and divergent below. Sub- 

 epistomal area large and oblique but concave. Face 

 micropubescent, relatively short because of the posi- 

 tion of the antenna and in consequence the front is 

 long. The gibbosity of the face has many extremely 

 long, moderately thick bristles and with some long, 

 stiff pile laterally and dorsally at the upper ledge 

 of the gibbosity. The bristles and pile are continued 

 down the sides of the subepistoma only on the upper 

 half ; the facial bristles extend out as far as the end 

 of the proboscis. Front long, pollinose, with a dense 

 tuft of bristly hair laterally and still longer, slender 

 bristles along the eye margin. Sides of the front 

 strongly dilated, convergent again at the vertex. The 

 vertex very little excavated, the ocellarium moder- 

 ately large but low, with 5 or 6 pairs of slender bris- 

 tles on either side between the ocelli, at least 2 pairs 

 between the posterior ocelli, and 2 or 3 pairs behind 

 the ocelli. Anterior eye facets strongly enlarged. 



Thorax: The thorax every where is short, micro- 

 pubescent; the pile of the mesonotum is scanty, con- 

 sisting of long, stiff, scattered hairs, more or less 

 appressed, a poorly differentiated irregular narrow 

 band of acrostical elements present, dorsocentral bris- 

 tles strongly differentiated beginning at the extreme 

 anterior margin, but becoming longer on the posterior 

 half of the mesonotum. Scutellum with long, coarse 

 hairs but with some bristles also. The following com- 

 plement of bristles is present in the type of genus: 

 6 short humeral; all remaining bristles extremely 

 long and rather stout; there are 2 immediate post- 

 humeral, 4 notopleural in a more or less transverse 

 row, 5 supraalar in a row, 7 postalar, 4 pairs of scutel- 

 lar bristles. The scutellum is moderately thick and 

 convex. Middle of mesonotum behind with a dense 



tuft of coarse, moderately long pile subappressed and 

 extended backward. Propleuron with long, dense, 

 coarse pile especially ventrally but also abundant dor- 

 sally and laterally; lateral pronotum with 9 bristles; 

 anterior collar with 10 pairs of long, stout bristles. 

 The anterior and upper posterior sternopleuron, the 

 dorsal and posterior halves of the mesopleuron and 

 the pteropleuron all have numerous, long, stiff hairs. 

 The posthypopleuron has 4 or 5 pairs, the metapleuron 

 with a medial vertical band of 10 to 12 stout, long 

 bristles and as many somewhat more slender, shorter 

 bristles; lateral slopes of the metanotum with a dense 

 tuft of 20 or more long, coarse, bristly hairs; lateral 

 slopes of the metasternum with abundant pile posteri- 

 orly, the ventral metasternum pilose, the postmeta- 

 coxal area membranous but pollinose and bearing dense, 

 fine, curled, moderately long pile. Tegula with a few, 

 stiff setae; anterior basalare with 5 long, coarse hairs. 



Legs: The pile of the legs abundant, coarse, pale, 

 opaque and flat appressed on the dorsomedial aspect of 

 the hind femur, the whole dorsal surface of the middle 

 femur, the dorsal and lateral surfaces of the hind tibia, 

 the dorsal and anterior surfaces of the remaining tibiae, 

 and on all of the tarsi. The following complement of 

 bristles is present on the hind tibia of the type of genus : 

 2 lateral bristles on the basal third, 4 near the apex in a 

 longitudinal row, with an additional apical dorsolateral 

 bristle; this tibia has 6 dorsomedial, 4 or 5 ventromedial, 

 6 dorsolateral and 5 ventrolateral bristles. Middle 

 femur with abundant, long, coarse, opaque, pale pile 

 ventrally, anteriorly, and posteriorly. There is a weak 

 posterior bristle at the basal third and a short, stout, 

 anterior bristle at the apical third. This tibia has 

 long but slender, strongly oblique bristles; there are 

 2 dorsal beyond the middle, 3 anterodorsal, 6 postero- 

 dorsal, and 8 apical bristles, 6 of them on the ventral 

 half. Anterior femur similarly with dense, long pile 

 and with 5 posterodorsal bristles on the outer half. Its 

 tibia has short dorsal bristles, 8 anteriorly and 8 poste- 

 riorly, 2 posteroventral bristles, and ventrally some 

 long, fine hairs. Apex without spine ; all of the tarsi 

 slender, the claws slender, sharp, curved at the base 

 and bearing slender, reduced pulvilli, the anterior pair 

 reduced to half the length of the claws, the middle and 

 posterior pair reduced to less than half the length. 

 Empodium bristlelike and not swollen. 



Wings: The wings are hyaline without villi. Mar- 

 ginal cell open but only by a distance equal to its width ; 

 the anterior branch of the third vein ends shortly before 

 the wing apex ; the posterior branch a somewhat greater 

 distance behind. First and second posterior cells 

 widely open, the fourth closed with a short stalk ; the 

 lower vein ending the discal cell and ending the fourth 

 posterior cell, while each is sinuous or curved, these 

 veins are aligned, xinal cell closed in the margin. 

 Alula moderately wide, the ambient vein complete. 



Abdomen : The abdomen is subcylindrical and gently 

 tapered. Pile of abdomen coarse, abundant, moder- 

 ately long and flat appressed, becoming a little longer 

 and subappressed laterally in the male on the sides of 



