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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



bristles. The proboscis is short but relatively slender 

 and cylindrical or slightly compressed laterally near 

 the apex, with a prominent dorsomedial ridge extend- 

 ing from the base and tapering near the apex. The 

 proboscis is not longer than the face, quite bluntly trun- 

 cate apically, and bears dorsoapically a tuft of bristly 

 hair; on the ventral surface on the outer third, on each 

 side, is a row of some 6 or 7 short, stiff hairs and near 

 the base ventrally are 4 exceptionally long, fine hairs. 

 The proboscis is directed chiefly forward and slightly 

 downward. Palpus clearly of two segments, both 

 short, the first segment hemicylindrical and excavated, 

 with several, ventral, bristly hairs. The second seg- 

 ment is swollen through the middle, narrowed at the 

 base and apex, and with a single quite long, slender, 

 apical bristle, considerably longer than the total length 

 of the palpus; second segment with a minute apico- 

 lateral pore. 



Antenna attached at the upper fourth of the head, 

 comparatively elongate and slender. The first seg- 

 ment is not quite twice as long as the second ; tliird seg- 

 ment missing in the only example available to me. The 

 first segment is plane dorsally, distinctly swollen, con- 

 vex in the middle from base to apex, and bears 2 stout, 

 moderately long bristles and 6 or 7 additional, shorter, 

 bristly hairs besides 1 or 2 minute dorsal setae. The 

 second segment is considerably swollen beyond the im- 

 mediate base, wider than the first segment and with 2 

 or 3 ventral setae. The face is comparatively short on 

 the dorsal half and gently concave; the antenna arises 

 from a low eminence, the lower half of the face is 

 gently rounded and convex. 



Head, anterior aspect : Face below antenna less than 

 one-third the head width. Subepistomal area small, 

 only slightly oblique, deeply concave and bare. The 

 face is micropubescent, with bristles restricted to the 

 lower half and with at least 4 pairs of moderately long, 

 rather stout bristles above the epistomal margin, and 

 with several additional, much more slender, bristly 

 hairs below these bristles. In the middle of the face on 

 the lower third are 3 pairs of close-set, slightly shorter, 

 but stouter bristles; upper half of face with a few, 

 short, curled hairs on each side. The front is short, 

 thinly micropubescent, with along the eye margin a row 

 of bristly hairs. The vertex is deeply excavated, with 

 strongly sloping sides; the ocellarium is large and high, 

 its sides not quite vertical and bearing in the middle 

 2 pairs of fine, comparatively short, bristly hairs and 

 with an additional pair behind the ocelli. Anterior 

 eye facets strongly enlarged. 



Thorax: The thorax is densely appressed pubescent 

 on all of the pleuron except the lower anterior corner of 

 the mesopleuron, middle of the sternopleuron and nar- 

 rowly on the margins of the mesonotum; the greater 

 middle portion of the mesonotum is shining. Pile of 

 mesonotum very short, curled, appressed and setate, 

 without differentiated acrostical or dorsocentral 

 bristles. The following complement of long, slender, 

 lateral bristles present: 2 notopleural, 3 supraalar, 1 

 postalar, 2 pairs of scutellar bristles. Scutellum mod- 



erately thick, convex marginally, densely short, curled 

 pilose, the basal crease deep. Propleuron ventrally 

 and laterally without pile. The dorsal collar has a 

 band of fine hairs and the upper lateral sclerite has 

 abundant, long, fine pile which is more or less appressed 

 and directed backward. The upper posterior portion 

 of the sternopleuron, the posterior half and dorsal mar- 

 gin of the mesopleuron with numerous, moderately 

 long, coarse hairs; the mesopleuron on its posterior 

 margin near the middle has a long and comparatively 

 stout bristle; pteropleuron with a few long hairs, the 

 upper posterior hypopleuron with several and the 

 gently convex sternopleuron has a vertical band of 

 long, slender bristles and bristly hairs. Lateral ineta- 

 notal slopes bullose and micropubescent only. Lateral 

 slopes of the metasternum and the ventral metasternum 

 with abundant pile; postmetacoxal area large and dis- 

 tinctly membranous ; tegula with 1 or 2 short setae. 



Legs: All the femora are stout and a little swollen; 

 the hind femur perhaps a little more than the others, 

 not quite plane ventrally, most of the swelling dorsal 

 and emphasized through the middle. Dorsal pile of 

 the femur short, dense, appressed and setate. Hind 

 tibia swollen distally from the base, the ventral surface 

 of this tibia and of the femur with abundant, long, fine, 

 erect pile; the medial surface has brush of appressed 

 setae only at the extreme apex. The following com- 

 plement of long, stout bristles is present: hind femur 

 with 1 lateral on the apical fifth, 1 dorsolateral on the 

 apical fourth, its tibia with 1 stout dorsomedial on the 

 apical fourth and 4 to 5 stout dorsolateral, 4 lateral and 

 3 ventrolateral on the distal half; apex with 6 to 8 

 bristles. Middle femur considerably shorter than the 

 hind pair, although the latter are not elongate; it bears 

 a very stout anterior bristle on the apical fourth, some 

 fine, long hairs ventrally at the base ; its tibia has 2 dis- 

 tal antero ventral and 1 or 2 short bristly hairs near the 

 middle, 1 anterior at the basal third, 2 long, stout an- 

 terodorsal, 2 or 3 shorter posterodorsal, 3 quite weak 

 posterior and 2 long, stout, distal postero ventral 

 bristles. Anterior femur without bristles and only 

 minute short hairs ventrally ; its tibia has 2 moderately 

 long, stout, posterodorsal bristles on the distal part and 

 1 stout, long posteroventral on the outer fifth, and 2 

 slender, short anteroventral bristles on the distal part, 

 which are little more than bristly hairs. Apex without 

 spine, the basitarsus slender. Tarsi end in sharp claws, 

 plane basally for most of their length, the bladelike 

 empodium half as long as the claw. 



Wings: The marginal cell is widely open, anterior 

 branch of third vein sigmoid, second submarginal cell 

 strongly swollen anteriorly at the base; posterior 

 branch of third vein ending well behind the wing apex ; 

 the second submarginal cell is flared and trumpet- 

 shaped. The first posterior cell is slightly narrowed 

 to three-fifths of its maximum width ; fourth posterior 

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

 second basal cell comparatively long; anal cell closed 

 with a short stalk; alula present but narrow, with a 

 short, free, distal lobe. The ambient vein is strong, 





