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UNITKD STATES NATIONAL MUSEUM BULLETIN 2 63 



as bristles of occipilnl row, pliicetl nlmosl exactly hehiiul 

 inner verticals; three or four rather fhie occipital 

 bristles; s;enal bristle cons|)icuous. Antennae (jjI. 'A\ . 

 fig. 5) inserted at middle of eye, attaining oral margin, 

 almost always yellow, white tomentose; second segment 

 comparatively small, nearly half as long as following 

 segment, with a disthict black median bristle; third 

 segment nearly 1.8 times as long as witle, ilistinctly 

 narrowed toward round apex, ventral margin strongly 

 convex; arista rather short, black, basal jiortion yel- 

 lowish and microscopically pubescent. Palpi (pi. 'M. 

 fig. 6) whitisli, large, fully 2.3 times as long as wide, 

 nearly straight, strongly narrowed at base, apex blunt, 

 with very few bristles. 



Thorax nearly 1.5 times as long as wide, 1.2 times as 

 long as high. Mesonotum (pi. 31, fig. 7) nearly as long- 

 as wide, blac^kish, with distinct light greenish-yellow 

 lateral streaks, which extend straight from humeral 

 calli to near lateral corners of scutellimi through noto- 

 |)leural calli. wholly obscured by whitish tomentum, 

 covered with a blackish very short fine pubescence; 

 humeral calli not pubescent, but with some short 

 yellowish bristles; notopleviral calli cjuite bare; scutel- 

 luin light greenish yellow, quite obscured by whitish 

 tomentum, nearly 1.4 times as wide as long, flat, with 

 distinct lateral carinae, lateral borders almost always 

 yellow, bare. Pleura (i)l. 31, fig. S) light greenish vellow . 

 lower two-thirds of sternopleuron excei)t ventral border, 

 portion just above hind coxa, liypopleuron, meso- 

 l)hragma, and postnotum, black, lower margin of 

 mesopleuron more or less blackish, entire surface 

 whitish tomentose; prothorax with three long yellowish- 

 white bristle hairs; meso|ileuron with some yellowish- 

 white setae on upper and hind borders; upper borders 

 of ptero- and sternopleuron with yellowish-white setae 

 directed upward; yellowish-white ])ubescence along 

 yellowish ventral border of sternopleuron rather dense 

 and long. All bristles blackish brown: sca])ulars two 

 pairs, fine, yellowish; liumerals as long as anterior 

 notopleural or jiresutural; posterior notopleurals slightly 

 shorter than anteriors; dorsocentrals slightly ahead of 

 level of anterior su[ira-alars, as long as present ellars, 

 almost always |)arallel but sometimes slightly conver- 

 gent; prescutellars slightly ahead of line connecting 

 inner posterior supra-alars, parallel, as long as the 

 latter; scutellars two pau's, the basal i)air longest of 

 all thoracic bristles, almost always very slightly diver- 

 gent, apical i)air a little shorter tlian basal and crossed; 

 mesoplcural bristle only one, directed ])osteriorly; 

 pteropleural almost always a little shorter than meso- 

 I)leural, more or less curved, directed slightly upward; 

 stenopleural as long as pteropleural, directed obliquely 

 upward. 



Al)(loinen (|)L 31, tig. D) blackisii, siigiilly dusted with 

 greyish tomentum, blackish pubescent, second to fifth 

 terga eai'h with yellowish or reddish-yellow ])osterior 

 margin; fifth tergum distinctly shorter than the two 

 |)receding terga together, posterior margin almost 

 always with five pairs of blackish bristle hairs, the 

 apical more or less conspicuous; genitalia moderate in 

 size, siiining orange j'ellow, blackish pubescent, 

 a|>|)eiulages orange yellow. 



Wing (pi. 31, fig. 1) longer llian body, 2.5 times 

 as long as wide, moderately narrowed at apex; costa 

 with two very fine costal spines, bent very slightly 

 inward just before middle of ai)ex of R,; R, mod- 

 erately curved toward costa; R2+3 nearly straight, 

 but bent into Ri at two-thirds from base, from which 

 [)oint a distinct straight veinlet stands upright and 

 often reaches bending of costa, this veinlet in numerous 

 S[)ecimens quite obsolete; R4+5 bare, jiarallel to m; 

 r-m below apex of R,, nearer to middle of iMo than 

 to its apex, very slightly conv^ex but ([uite perpendicu- 

 lar; in-cu straight, parallel with r-m, distinctly longer 

 tiian second section of anterior margin of IM2; ptero- 

 stigma nearly half as long as second costal cell, pointed, 

 blackish, ai)ical portion light yellowish, narrow basal 

 j)ortion hyaline to very slightly darkened; anal cell 

 conspicuously shorter than basal cell, apical margin 

 distinctly concave. Wings hyaline, with darkened 

 spots as follows: Ri with two spots, tiie apical at apex 

 extending posteriorly into R3, the bandlike second 

 spot on veinlet, almost always conspicuous and extend- 

 ing from costa to just below R2+3, rarely anotlier faint 

 s|)ot below pterostigma; R3 with a very faint apical 

 si)ot at end of R2+3; R3 with three spots, the basal 

 on r-m a very narrow band and almost always very 

 faint, the distal below apical spot in R,, broad, very 

 faint, extending the entire width, the remaining spot 

 at middle very small, dotlike and very faint; 2M2 

 with a very faint band on m-cu. Halteres light orange 

 yellow; sfpiamulao wliiti>li hyaline, with margins 

 yellowish. 



Legs rather strong, yellow to liglit reddish yellow, 

 blackish pubescent. Foreleg (pi. -U . fig. 11) slightly 

 shorter than others: femur distinctly longer than tibia, 

 externoventral margin with one row of five to seven 

 long bristly yellowish or brownisii hairs, dorsal surface 

 with two rows of many shorter brownish bristly hairs; 

 tibia shorter than tarsus, pubescence on dorsum longer 

 than others; first tarsal segment nearly as long as four 

 folloW'ing segments together, l)rushlike bristles on 

 intcrnoventral surface yellowish and not conspicuously 

 long. Midleg (pi. 31, fig. 12) nearl}- as long as hind- 

 leg: femur distinctly longer tlian tibia, dorsal surface 

 with short blackish bristly hairs; tibia nearly as long 



