58 



UMTKD STATES NATIONAL MUSEUM BULLETIN 263 



bristles exlendiiis to middle ()f eye; geiial bristle coin- 

 piiratively long. Anteium (pi. 22, fig. 2) sliorter than 

 face, yellow; second segment comjjaratively short, 

 with a short median bristle nearly as long as bristle 

 of inferior corner, apicjil marginal l)ristles conspicuous; 

 third segment darkened, nearly lialf as long as wide, 

 gradually narrowed toward I'ound apex, with \entral 

 margin rather strongl}- coinex and dorsal margin 

 moderately siiuiate, the e.xternal surface eveidy covered 

 with a dense brown microsco])ical pubescence; arista 

 black, basal segments light yellow, disthiclly but 

 sparsely plumose. Palpi (pi. 22, fig. 3) light yellow, 

 rather slender, apex rounded, with long, black bristles. 

 Thora.x 1.8 times as long as wide, nearly 1.4 limes 

 as long as liigh. Mesonotum (])1. 22, fig. 7) slightly 

 wider than long, somewliat rounded, shining reddisji 

 yellow, obscured by blackish j)ubescence, five l)ro\vn 

 streaks as follows: median from a point anterior to 

 middle of ])rozona to middle of metazona, pointed at 

 anterior end and diviiling in two and comiecting with 

 submedian ones at jiosterior end; submedian from 

 inner corners of luuiieral calli to scutelhim extended 

 to lateral margins of scutelhim and curved inwardly 

 posteriorly; lateral broken uj) into four spots, the 

 anterior two on prozona, i)(isterior two on metazona, 

 the ])osteriormost pair the longest; lunneral calli 

 shining whitish yellow, furnished with \ery sparse 

 erect blackish pubescence; notoideural calli com- 

 paratively small; scutellum nearly twice as wide as 

 long, disk rather convex, basal tiiird slo])ing forward, 

 lateral l)orders broad and per|)endicular, ivory yellow, 

 black lateral longitudinal stripes continuing from 

 mesonolal streaks to a point beneath posteroe.xternal 

 margins, basal corners distinctly reddish yellow; 

 mesophragma and ]K)stnotum shining black, with a 

 narrow reddish-yellow longitudinal stripe throughout 

 entire length, the former with a pair of reddish-yellow 

 lateral spots. Pleura (pi. 22, fig. 8) blackisli brown on 

 upper half, leaving a narrow yellowish dorsomarginal 

 longitudinal band and light reddish yellow on lower 

 half, sparsely covered with black erect pubescence, 

 especially distinct on mesopleuron; ])rothorax blackish 

 brown with large median ])ortion yellowish, with about 

 four black fine but conspicuous setae; sternoiileuron 

 with long black somewhat bristh' hairs along vential 

 margin. All bristles black: inner scapulars farther 

 apart than inner and outer scapulars, divergent; 

 humeral situated posteriorly, as long as presutural; 

 anterior notopleural about as long as posterior or 

 presutural; dorsocentrals conspicuously behiiul level 

 of anterior supra-alars, both similar in length; ])re- 

 scutellars .slightly beiund a line connecting hmer 

 posterior supra-alars, nearly as long as dorsocentrals; 



apical sculcllars ])arallel, as long as liasal, both dis- 

 tinctly longer llian liairs on mesonotum; meso])leurals 

 two, tlic upper as long as notopleurals, tlie lower 

 shorter; iJtcrophMiial bristle weak, sliort, sternoplciu'al 

 strong an<l long. 



Abdomen ([A. 22, fig. 9) (without o\ipo>it(ir) 

 sligiitly shorter than thorax aiul conspicuously wider, 

 third lergum broadest, shining oclu'aceous willi lateral 

 Ixirdcrs l)lack, covereti by l)lack depressed |)ul)escence 

 wiiicli is erect and longer on basal two terga; first 

 tergum lirownisli on large median portion; third to 

 fiflli terga witli a pair of black l)asal bands wliich 

 become broader laterad and connect with black lateral 

 borders, on fiftli almost discoimected along basal 

 margin; sLxth tergum nearly 1/3 as long as preceding, 

 with three pairs of cons])icuously long black marginal 

 bristles, between them some bristly hairs; steriui 

 evenly ochraceous, pleural membranes brownish; ovi- 

 })ositor long and dei^ressed, basal segment as long as 

 four apical abdominal terga together, nearly 1.(5 

 times as long as wide, with distinct lateral carinae, 

 black i)ubescent, second segment light yellowish. 



Wing (i)l. 22, fig. 1) longer tium l)ody, gradually 

 narrowed toward round apex, costal aiul posterior mar- 

 gins rather similarly curved outward; costal vein with 

 very short costal spuie as long as marginal bristles, no 

 distinct basal bristle on first section; Rj rather straight, 

 more or less curved anteriorly at tip; R2+3 liardly 

 undulate at apical half; R4+5 nearly straight, apical 

 half of apical section dii'ected slightly posteriorly; m 

 parallel with R^+s apically; r-m straight and compara- 

 ti\-ely short, perpendicular, nearer middle tluin a[)ex 

 of IM2; m-cu straight, 2.5 times as long as r-m; ]itero- 

 stigma as long as second costal cell; anal cell distinctly 

 shorter than basal cell, but with long sharp inferior 

 prolongation not exceeding tip of basal cell. Blackisli 

 brown, base light brownish yellow, alulae hyaline, anal 

 lobe more or less greyish with hyaUne indentations and 

 spots. Three distinct costal indentations; the first in 

 second costal cell, very broad, leaving only both eiub 

 of cell, extending posteriorly to rs, nu)re or less j'ellowish 

 tinged; the second occupying basal third of pterostigma, 

 quadrate; the third situated just beyond ti]) of ])tero- 

 stigma, nearly 2/5 as wide as mouth of Ri, triangularly 

 extending almost to R4+5. Two very large posterior 

 indentations, one in 2M2 and the other hi fu; formei' 

 somewhat triangular, greyish, nearly filling entire cell, 

 leaving oidy narrow margins along veins; the lattei- 

 r(uadrate, greyisli, occu|)ying apical two-thirds which 

 is left subtriangularly along ('u. Four hyaline sjjots as 

 follows: one round sj)ot before middle of R5, nearer to 

 R4+5 than to m; one near m-cu in IM2, largest and 

 transverse, dividing into two round spots, their inter- 



