8U 



UNITKD STATES NATIONAL MUSEUM BULLETIN 263 



spiciiously sliorter and situated near i)recedin<2:; i)ost- 

 verticals comparatively long, |)arallel; inner verticals 

 longest of all head bristles, jjarallel, the outer pau" 

 longer than jjostvorticals, at level of latter a yellowish 

 short bristle (inner occii)ital) behind iinier \erticals; 

 occipital row of about three ratlu'r lonu' biistles; genal 

 bristle ratlier weak, dark coloreil. 



Thorax distinctly longer than \\i(U' or high, very 

 slightly longer than abdomen. Mesonotum (|)1. 30, 

 fig. 7) as long as or a little longer than wide, anterior 

 border rather strongly jjroduced forward, ])la(kish 

 brown, entirely obscured by dense greyish-yellow 

 toinentum, covered witli numerous fine, short but 

 stout yellow depressed hairs, large ])er|)endi(idar area 

 just above neck quite bare and shining black, with 

 five very narrow brownish longitudiiuil stri|)es, the 

 median one and sublateral pjiir extending from immedi- 

 ately beliind anterior margin to nuddle of metazona, 

 and lateral pair from suture to bases of inner posterior 

 sui)ra-alars, all these strijies united at their ])osterior 

 ends, leaving a large ill-defined brownish i)atch on 

 posterior half of metazona, with six more or less dis- 

 tinct blackish dots at bases of dorsocentrals, prescutel- 

 lars, and iruier posterior sui)ra-alars; humeral and 

 noto])leural calli more yellowish, the former with two 

 or three liglit yellowish setae, the latter well elevated; 

 scutellum 1.7 times as wide as long, somewhat tri- 

 angular, disk rather flat, lateral borders nearly i)er])en- 

 dicular, blackish, obscured by light brownish-yellow 

 tomentum, but not pubescent; mesoiihragma and 

 I)()stn()tum colored and tomentose as on scutellum. 

 Pleura (pi. 'M). fig. S) paler than notum, densely covered 

 with reddish, yellowish-grey tt)mentum, with many 

 fine whitish hairs, sterno])leuron less tomentose so 

 that it might be described as "black" and less pubes- 

 cent ; ])rothorax reddish yellow, willi lliiee or four 

 short yellowish bristly hairs; sternopleuroii with long 

 whitish hairs on inferior border. All bristles black: 

 scajjulars not developed, anterodorsal margin with 

 short blackish erect setae; humerals, anterior noto- 

 pleurals and presuturals nearly the same length, the 

 former pair finer and shorter, the latter ])air stronger 

 and longer; ])osterior noto])leurals nearly half as long 

 as anterior; dorsocentrals slightly ahead of line con- 

 necting anterior su])ra-alars, nearly as long as latter, 

 parallel; present ellars just ahead of level of inner 

 posterior supra-alars, distinctly shorter and finer than 

 latter, parallel; scutellars two pairs, the basal strongest 

 and longest of all thoracic bristles, ])arallel, ajiical 

 pair crossed, short but slightly longer than ])osterior 

 notopleural; nies()i)leurals two, the lower fine and 

 short; pteropleural and sternopleural distinct, both as 

 long as u|)per mesoi)leural. 



Abdomen {\)\. '.W, fig. 9) usually luiri'ower than 

 thorax, black, entirely obscured by brownish-grey 

 tomentum; fifth tergum nearly as long as second, 

 shorter than llie two |)recedmg terga together, ])osterior 

 nnu'gin willi about five pah's of black bristly hairs; 

 genitalia black, ap|)endages small and yellow i^li; sterna 

 blackish, less tomentose. 



Wing (pi. 30, fig. 1) distinctly longci- than body, 

 fully 2.4 times as long as wide, with apex rather nar- 

 rowly rounded; R, gradually curved ai)ically toward 

 costa so that a])ex of ])terostigma is narrowly jiointed; 

 Ro+a and R4+5 nearly straight and moderately divergent, 

 the latter not bristled; m hardly curved a])ically not 

 divergent from R4+5 at apex; r-m far beyond middle of 

 IM2. almost straight, hardly oblique, ])osterior end 

 very slightly closer to wing tip; ni-cu straight or slightly 

 convex, the anterior end nearer wing-base than tip 

 so that mferior angle of IM2 is moderately pomted; 

 ])terostigma about three-fourths as long as second 

 costal cell; anal cell distinctly shorter than basal, 

 inferior angle more or less produced; anal lobe com- 

 paratively narrow. Wing blackish brown, base whitish 

 subhyalinc, many whitish subhyaline s])ots as follows: 

 second costal cell with two very large qiuidrate spots, 

 extreme base with one very narrow spot, all reaching 

 from costa to subcosta and separated by narrow black- 

 ish-brown streaks, median spot extending posteriorly 

 very narrowly to base of Cn, uiterrupted at ])osterior 

 half of apex of Ijasal cell, basal s])ot l)ida(ily extending 

 ])osteriorly to basal half of anal cell ])ut interrupted 

 by dark base of radial vein and connected with former 

 sjiot just below rs; ])terostignni with a light reddish- 

 yellow oval spot near its base, extreme base very 

 narrowly subhyaline; R, with three indentations 

 reaching R0+3, the l)asal two situated very close to- 

 gethei', tlie basal just beyond pterostigma larger than 

 others, the apical at middle of a])ical half of mouth 

 smallest and roundish, a very small round dot just 

 below a|iical s|)ot of secoiui costal cell; R3 with one 

 roundish indentation and five small rounded spots, 

 the spot near base is (piite round, the next two just 

 below first two indentations of R, almost always con- 

 nected with latter, the fourth just below apical inden- 

 tation of Ri snudlest, below it, but slightly beyond, 

 one quite round spot, the indentation separated fioni 

 tip of R243; R with one roniul s])ot near r-m; R,., with 

 one very large semicircular indentation, occu])ying 

 entire a])ex, ami thiee louiul s])ots, the basal one far 

 above m-cu larger tlum the I'emaining ones, the apical 

 two just beyond middle ahuost jierjiendicidar, the one 

 along R4+5 brown and tlie other near m; iMj with two 

 round s])ots along m, the basal before middle more or 

 less larger than the other one situateil immediately 



