56 



UMTKU STATES NATIONAL MUSEUM BULLETIN 2()3 



fig. I?) sliiiflitly broader tliaii long, -vvitli straiglit lateral 

 niarjiins, tipper half brown, reiuaiiuler wiiitisli yello\\ ; 

 orbits N\ell defined witli (inc l)lacki.sh lines, rather nar- 

 row; antennal grooves shallow and short, below each 

 a distinct narrow longitudinal sulcus \\ith minute 

 hairs; moderately liollowcd in pnifiic. Back of liead 

 (l)l. 21, fig. 1) brown to blackish, pale brown to pale 

 reddish yellow toward lower border, rather n^oderately 

 swollen ; cheeks somew hat brownish, strongly developed, 

 but witli nearly straiglit lower margui, vibrissa! edge 

 wilii black i)ristles, infei'oposterior portion with black 

 hairs intermixed witli long bristly bail's, the posterior- 

 most conspicuously long, about as long as genal bristle. 

 Eyes black, in profile nearly 1.4 times as long as wide, 

 lower angle distinctly narrowed. Antennae (pi. 21, 

 fig. 4) short, brownish yellow; first segment very short, 

 a few black short bristles on dorso-apical border; 

 second segment nearly triangular, with median bristle, 

 lower a[)ical corner with several black long bristles; 

 third segment nearly 2.5 times as long as wide, narrowed 

 toward round apex, with rather straight dorsal margin; 

 arista distinctly longer than antenna, black with basal 

 portion light yellow, sliort pubescent througliout. 

 Palpi (pi. 21, (ig. 5) comi)arati\ ely large, dirty yellow 

 to llglit yellow, twice as long as median width, dorsal 

 margin almost straight, ventral margin strongly curved, 

 Mith many black bristles. All bristles black, rather 

 strong; ocellars longer than inferior fronlo-orbitals, 

 divergent, and moderately curved l)elow ; postverticals 

 very short, spaced widely ajjarl, ])arallcl, directed 

 forward; inner verticals longest, nearly ])arallel, their 

 apices directed slightly inward, outer verticals about 

 as strong as upper superior front o-orl)ital directed 

 outward, 2:2, superior two posleroinedially to it a 

 short bristle (inner occi])ilal) distinctly isolated from 

 occipital row, fronto-oibitals directed posteriorly, 

 lower one of which is very sti'ong, inferior two pairs 

 rather weak, directed slightly inward; bristles of oc- 

 cijjital row consi)icuous, extending to a point below- 

 middle of eye. 



Thorax slightly longer than abdomen, rounded, 

 strongly swollen above. Mesonotum (pi. 21, fig. 6) 

 as long as wide, shining black, obscured by a grey 

 tomentum and a yellowish pubescence, broad marginal 

 borders, one pair round spots situated just inside ends 

 of sutures, two roundish prolongations of the tomentose 

 area l)etween the humeral calli; humeral calli rather 

 small, brownish yellow, furnished with long sparse 

 yellowish hairs; scutellum large, swollen, with round 

 apex, sinning l)lack, di.sk with black erect hairs. Pleura 

 (pi. 21, fig. 7) light castaneous, mesopleuron yellowish 

 white ami sijarselv covered with vellowish erect hairs, 



anterior hiferior margins redilish brown, ptcro- and 

 metapleuron gi-ey tomentose; postnottim distinctly 

 whitish tomentose, transverse-bandlike shape. All 

 l)ristles black, strong: scapulars 2 pairs, inner pair 

 rather close together, |)arallel, ami directed very slightly 

 posteriorly, outer pair somewhat weaker than inner; 

 humerals at about: middle of calli, nearly as long as 

 anterior notopleural, almost always curved postei'iorly, 

 parallel with the latter; presuturals very much stronger 

 than iu)to|)leurals, of which the posterior is weaker 

 than anterior; su])r!i-alars 1:2, the posterior longest; 

 dorsocentrals just behmd a line connecting anterior 

 supra-alars; prcscutellars as long as dorsocentrals; 

 scutellai's 2 pairs, the apical directed slightly inward; 

 meso-, ptero-, and sternopleurals well developed, each 1. 



Abdomen (pi. 21, fig. S) much broader than thorax, 

 rather round, shining black, with two broad ciuispicuous 

 snow-while tomentose and pubescent bands, the first 

 on entire second tergum and the second on posterior 

 half of fourth tergum; ])ubescence on l)lack portions 

 black and hau's very minute, posteiior margins of 

 second to fifth terga with distinct rows of black bristly 

 hairs, becoming gradually longer on posterior terga, 

 posterolateral corners of second tergum m ith long black 

 erect hairs. Genitalia reddish brown to yellowish brown, 

 comparatively large, the basal portion almost always 

 visible from above, with conspicuous but fine sparse, 

 erect black hairs, appendages small and short, with 

 short setae. 



Wings (pi. 21, fig. 9) comiiaratively large, gradually 

 narrowed toward narrowly rounded a|)ex, anterior and 

 ])osterior margins moderately curved outward, nearly 

 ludf as wide as long, with tlu'ee Ijroad black bands 

 radiating from the ])terostigma; the apical (or costal) 

 l)and broadest, leaving a very fine transparent marginal 

 costal stripe that is triangularly notched twice at Ro+s 

 and R.14.S, respectively, a rounded notch in addition 

 immediately below first notch and just below pca'tion 

 between R, and R2-1-3, another narrow transparent stripe 

 intcrr)i])ted twice by two fine black lines reaching costa; 

 file middle baiul narrowest and extending from r-m to 

 ti|) of cu, curved slighth' outward; tiiird l)aiid from 

 ];)terostigma to near apex of anal lobe connected with 

 basal streaks whicii are united to l)lackish base. Costal 

 vein attaining tip of m, with two distinct bristles, one 

 at middle of first costal cell, one (costal s])ine) at incision 

 at tip of sc; subcostal vein undulate, its apical section 

 very fine but distinct ; R, distinctly bristled throughout, 

 strongly curved apically, R2+3 undulate, Jii+r. slightly 

 undulate a])ically. sparsely bristled from base to just 

 bej'ond r-m; a])ical section of m ])arallel witli R4+5; 

 r-m straiglit beyond middle of 1 Mj peipendicular; 



