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UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



quite fine hairs. Base below with a few long hairs 

 and 2 long, oblique hairs in the middle. Palpus of 

 two segments, the first excavated, the second a little 

 longer, robust, widest in the middle with apical pore 

 and slender, bristly hairs. The antenna is attached at 

 the upper third of the head, the first two segments of 

 equal length and each is about 1% times as long as high. 

 First segment with 1 setae above and at the base ven- 

 trolateral^ 4 setae directed forward. Second segment 

 with numerous setae above and below and 2 conspicuous 

 ventral bristles. Third segment nearly twice the com- 

 bined length of the first two segments, somewhat 

 widened or dilated along the middle, more narrow at 

 base and distinctly tapered on the outer third. Dor- 

 sally it bears about 7 bristles. At the apex there is a 

 minute opening with a short, exposed spine. 



Head, anterior aspect : The head is twice as wide as 

 high; the face is nearly one- fourth the head width, 

 distinctly wider below, without pile but densely covered 

 with pale, appressed micropubescence. It bears 2 close- 

 set rows of long, quite stout, pale bristles set trans- 

 versely above the epistoma. These rows contain at 

 least 30 elements. Front wider than upper face, 

 sunken, pollinose with a dense patch of bristly pile 

 along the eye margin and another submedial patch of 

 similar, appressed pile on each side. Vertex slightly 

 narrowed, moderately excavated; the ocellarium is 

 quite large and obtuse with large ocelli and on each 

 side a row of 4 slender bristles. 



Thorax : The thorax is large and robust, the meso- 

 notnm low and rather flattened with the anterior mar- 

 gin abrupt. The surface of the mesonotum in great 

 part is bare with wide, bare, medial stripe without pile 

 of setae or bristles. There are fine, dorsocentral setae 

 anteriorly which behind the suture become long, slender 

 bristles, 4 in each row, besides additional bristly hairs. 

 Lateral bristles exceptionally long and stout. There 

 are 3 humeral bristles set anteriorly, 3 notopleural, 3 

 supraalar, 3 on the postalar callosity, and 1 or 2 pairs 

 on the scutellar margin. The scutellum is thick, quite 

 flat on the disc without a basal crease except laterally 

 and the bulbous, metanotal callosity is pollinose only. 

 Propleuron with 1 stout bristle laterally, the pronotum 

 with weak bristles and pile. Lower cervical sclerite 

 with quite dense, long, fine pile. Pleuron pollinose, 

 without pile on the mesopleuron but with 20 or more 

 long, fine hairs on the upper sternopleuron; meta- 

 pleuron with 4 long, stout bristles and numerous long, 

 slender bristles or bristly hairs. Postmetacoxal area 

 membranous; presternum fully dissociated. 



Legs: The legs are moderately elongate; all the fem- 

 ora are stout and rather densely appressed setate, 

 and almost without bristles. The hind femur lacks 

 bristles; at the apex it has 3 stiff, dorsolateral and 4 

 stiff, dorsomedial hairs which extend past the apex. 

 Ventrally it has on each side a row of 7 or 8 long, slen- 

 der, nearly erect, bristly hairs. The bristles of the tibia, 

 while not numerous, contain some long, quite stout ele- 

 ments and some quite slender and weak. Hind tibia as 



long as the femur, stout, of uniform thickness and with 

 1 basal dorsomedial bristle, 2 very slender dorsomedial 

 elements along the middle, 1 weak basal dorsolateral, 

 1 exceptionally stout, conspicuous dorsolateral bristle 

 at the basal third and also 2 equally prominent ventro- 

 lateral bristles situated at the middle and beyond. The 

 apex has 1 dorsolateral, 1 lateral, and 3 ventral bristles. 

 Hind basitarsus more slender than tibia, a little longer 

 than the next two segments and the end tarsal segment 

 unusually long, Avider and stouter than the preceding 

 two segments, Middle femur with a single, stout, pos- 

 terodorsal, subapical bristle, and also a few long hairs 

 ventrally; middle tibia with 2 weak, basal anterodorsal 

 and along the middle 2 quite stout, anterodorsal bristles. 

 Posterodorsally this tibia has 2 or 3 slender bristles in 

 the middle and ventrally 2 long, oblique, spikelike 

 bristles at the middle and beyond. 



Anterior femur somewhat arcuate anteriorly and a 

 little compressed laterally, without bristles but with 6 

 or 7 fine, long hairs. The anterior tibia has 4 short 

 anterodorsal, 4 slightly longer posterodorsal bristles 

 and the same oblique, stout, ventral bristles as found 

 on the middle tibia ; no spine or protuberance is at apex. 

 Middle and anterior basitarsi and their respective end 

 tarsal segments formed as they are on the hind leg. 

 All tarsi end in very long, exceptionally large, stout, 

 sharp claws, curved only at the apex, with an additional 

 claw arising on each side at the base, which is much 

 shorter than the other claw. Pulvilli absent, ventral 

 surface of the end tarsal segments with an apical, pad- 

 dlelike protuberance. 



Wings: The wings are hyaline, in part grey from 

 dense villi. Marginal cell open by less than its maximal 

 width. Anterior branch of the third vein rather 

 strongly arched forward, ending above the wing apex. 

 First posterior cell widely open, fourth posterior cell 

 closed and stalked, the vein closing this cell and the 

 medial crossvein nearly aligned in a row. Posterior 

 crossvein nearly or quite absent. Anal cell open, alula 

 large. The ambient vein is complete and bears a com- 

 paratively long, dorsal and separate ventral fringe. 



Abdomen : The abdomen is robust at the base, though 

 not as wide as the mesonotum. It is gently tapered be- 

 yond the first segment but still rather stout and sub- 

 cylindrical on the ultimate segment. Surface covered 

 with abundant, appressed, coarse setae and along the 

 sides of the first, second, and third segments are a num- 

 ber of fine, long hairs. Sides of first segment also with 

 4 long, stout bristles. Males with seven tergites and a 

 mere linear trace of the eighth on the left side. Male 

 terminalia rather large and rotate and conspicuous, 

 chiefly because of the laterally extended and convex 

 gonopod. Whole terminalia similar to Diogmites Loew. 

 Hypandrium large, more or less triangular with the 

 lateral margins gently convex. Epandrium cleft with 

 the proctiger between and both the epandrium, the 

 apex of the hypandrium and especially the apical part 

 of the gonopod with numerous, long, bristly hairs and 

 slender bristles, some of which become quite stout on 

 the distal part of the gonopod. 



