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UNITKD STATES NATIONAL MUSEUM BULLETIN 203 



densely covered with yellowish white, siiort but stout 

 l)ul)escence; huiiieral calli yellow, with luaiiy short 

 yellowish bristly bail's; notopleurai calli ahiiost always 

 reddish yellow, witli yellowish puliesceiice; scutelluin 

 distinctly liirht yellow, obscured by yeliowish-urey 

 tonientuni and witii some yellowish, coniparatix ely 

 long, s|)arse bristly liairs all over s\u'rac(>, ccunpara- 

 tively loiiir but distinctly wider than ioim', disiv flat, 

 lateral carinae more or less disliiict, lateral l)ordeis 

 rather per|)endicular. I'lciu'a (])!. 29, fig. S) black, 

 with a rathei' l)roa(l yellowish doisal band fi'om liu- 

 nieral callus to wing-base, covered with very sjjarse 

 yellowish-white short bristly iiairs longer tlum those 

 on notum, prothorax black, more or less reddish toward 

 stigma, almost always with two short yellciwish-white 

 l)ristles; aTiterior and posterior stigmata reddish yellow; 

 mesopleuron witli ])osterior m.-irgin light yellowish, 

 pubescence on u])per yellowish port ion and posterior 

 bonier longer and stouter than on others, ptero- 

 pleuron with cons])icuous long and stout liristly hairs; 

 sterno]ileuron with long yellowisli haiis along ventral 

 margin; mesophragma and postnolum black, more 

 or less greyish tomentose. All bristles black: scajjulars 

 not distinct, anterior- margin of mesonotum with very- 

 short bristly hairs; hunierals, presuturals, and anterior 

 notopleurals almost the same length, ])osterior noto- 

 pleurai nearly one-third as long as anlcrinr; dorso- 

 centrals distinctly anterior to a line connecting roots 

 of anterior supra-alars, nearly as long as latter, paral- 

 lel; ])rescutellars very slightly anterior to le\el of 

 imuM' posterior supra-alars, parallel, a little shorter 

 than latter; outer posterior supra-alars distinctly 

 curved, x'ery short; scutellars two [)airs, the basal 

 longest of all thoracic bristles, as long as apical pair, 

 which is always crossed; niesopleural one, in addition 

 moderately strong yellowish-white bristles; ptero- 

 ])leural bristle always yellowish brown, rather strong 

 and almost always dii-ected posteriorly, below it some 

 yellowisli white ratiier long bristly haii's; sternopleural 

 nearly as long as meso|)leural, dir-ected somewhat 

 upward. 



Abdomen (pi. 29, fig. 9) nearly as long as thorax, 

 blackish brown to black, very often somewhat reddish 

 on posterior margin of each tergum, coNcred with a 

 yellowish-grey tomentum and dense yellowish-wbite 

 short setae; second tergum sometimes reddish brown, 

 with lateral borders often jialer; fifth tergum almost 

 always shorter than the two preceding terga condjined, 

 apical border somewhat triangularly reddish yellow, 

 posterior margin with two or three pairs of black 

 long bristly liairs; genitalia conspicuous, shining 

 reddish brown to blackish, a])i)endages light yellow; 

 pubescence on sterna finer than that on terga. 



Wing (pi. 29, fig. 1) shorter than body, nearly 2.5 

 times as long as wide, evenly narrowed toward the 

 rather narrowly rounded apex, with a distinct black 

 costal spine; Ki ending basad of r-m, moderately 

 curved so that tij) of pterostigma is sharply |)ointed; 

 R2+3 more or less curved, moderately divergent from 

 Ri+-,; the latter not bristled, pai-allel with m in the apical 

 section; r-m straight, perpendicular, distance from m-cu 

 less than its own length; ni-cu more or less convex, 

 with anterior and ])osterior ai)ical angles of iMj rather 

 right angled; pterostigma distinctly shorter than second 

 costal cell; anal cell shorter than basal, with apical 

 margin slightly concave, inferior angle more or less 

 prolonged. Wings whitish, with broad short costal 

 streak, broati median cross band and broad apical 

 band, blackish l)rown; costal streak from base to tip 

 of ])terostigma extending iiTegularly behind to R2+3, 

 basal half to m, quite black in the pterostigma but 

 both extreme ends paler, often at middle a somewhat 

 paler dot, below pterostigma a short but broad |)ro- 

 longation into R3, in second costal cell two light yellow- 

 brownish subhyaline indentations, the apical one 

 extending to R2+3, the basal one very near its base, 

 first costal cell and a portion below second costal cell 

 irregularly light yellow brownish. Median crossband, 

 over r-ni and m-cii, united with costal streak at a|)ex of 

 pterostigma, nearly the same width throughout, with 

 one whitish indentation and five to seven light yellow- 

 brownish subhyaline spt)ts on anterior half, indentation 

 just beyond pterostigma often light yellow brownish 

 ])osteriorly and (juite constant, the spots rather irregu- 

 lar, posterior margin of this band sometimes notched 

 just above Cu. Apical band from nearly the apical 

 third of the apex of R, to a])ical half of 2Mo, with one 

 row ot two or three whitish or light j-ellowish subhyaline 

 spots extending from anterior corner of R3 to middle of 

 of R5, the posterior one almost always very large and 

 united with the whitish very broad subhyaline cross 

 l)and between brownish median apical bands, some- 

 times in addition one or two very small yellowish-brown 

 dots in R3; basal half of Cu almost always with three 

 small brownish ill-defined spots, the interno-inferior 

 one sometimes larger and uniting with a large ])aler 

 spot just below anal vein, and interno-apical spot often 

 obsolete. Halteres light yellowish to light reddish 

 yellow; squamulae whitish yellow. 



Legs light reddish yellow, hind femora somewhat 

 blackish brown at basal two-thu'ds, brownish pubescent. 

 Foreleg (pi. 29, fig. 11) distinctly shorter than others; 

 femur distinctly longer than tibia, pubescence on 

 externodorsal surface rather strong, externo\entral 

 margin with one row of long black bristly hairs through- 

 out entire lengtii; tibia as long as tarsus; first tarsal 



