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UNITED STATES NATIONAL MUSEUM BULLETIN 2():5 



sided, 2,'^ times as long as wide. apiJi-oxiiiiately '4 as 

 wide as head, yellow, witli an ill-defined, somewliat 

 quadrate median sjjot on the posterior lialf between the 

 two inferior fronto-oi'bilal bristles, the narrow posterior 

 mari^in of lumde, and a transverse band on the vertex 

 inc'ludino; the black ocellar triansjle, reddisli l)rown; 

 vertical calli faint, covered witii a sjjarse yellow jjubes- 

 cence; the fronto-orbitals with a very short brownisli 

 pnl)escence, the posterior portion being sli<ihlly reddisli 

 l)rown. Face (|)1. 4, fig. 2) a little sliorter liian the widtli, 

 rallier strongly widening below, pale yellow, with two 

 pairs of black spots, of wliicli the njjper one is a minute 

 dot and the lower one oblong and placed on the inner 

 side of antemial groove; epistonia with tlu-ee blackisli 

 s|)ots, the media!i one being very minute and the lateral 

 ones ill defined but moderately large; antemuil grooves 

 wldtisli, \erv minute black setae on lower ])ortions; 

 eye-margins well defmed, very narrow; in jirotile moder- 

 ately swollen just above the middle, shallowly hollowed 

 anteriorly and tlie lower half to the upper mouth-edge 

 almost straight. Back of head (pi. 4, fig. 4) moderately 

 convex, yellow with a large mediiin portion black, some 

 l)ale hairs on lower portion, near the occij^ital foramen 

 tliere is a row of black short setae; cheeks ralhcr narrow, 

 somewhat brownish below the k)wer cornel' of eye, a 

 few black short bristly luiirs along lower inargin. Anten- 

 nae (pi. 4, fig. 12) yellowisii brown, with llic two basal 

 segments paler; second segment with some pale bristly 

 liairs near the lower angle, a few black short ones near 

 the a])ical margin of outside. Some black setae along 

 upper margin, a distinct median bristle and a conspicu- 

 ous basal bristle; tiiird segment approximately 2)2 times 

 as long as the second, nearly ,3/2 times as long as wide, 

 with apex rounded; arista black, the basal tliird yellow- 

 ish. Palpi (pi. 4, fig. 5) yellow, rather broad, distinctly 

 curved upward and gradually widened towards tlie 

 rather oblique apex, nearly twic-e as long as wide, tlie 

 lower marginal area furnished with some brown bristly 

 liairs, very few setae about the middle on upjier margin. 

 All bristles blackisli brown; fronto-orbital 1 : 2, rather 

 short, the upper inferior being placed halfway between 

 su])erior and lower inferior; ocellars minute; inner verti- 

 cals nearly parallel, somewhat stronger than the outers; 

 genal rather conspicuous; occipital row consistmg of 

 only five short bristles, rather widely placed; post- 

 vertical wanted. 



Mesonotum (])1. 4, fig. 7) black, covered with a grey- 

 ish tomentum and black or yellowish setae, the former 

 forming five very broad longitudinal strijjes, of whicJi 

 the median occurs onlj^ behind the suture and is a long 

 triangle in form, the outer pair interrupted at the suture, 

 the submedian jjair not attainmg both margins; humeral 

 notopleural, and lateral postsutural calli conspicuously 



straw yellow; setae black abt)ut I lie aiilerinr half, yellow- 

 ish on tlie posterior half, but hlack about the lateral 

 borders, very pale on the calli. Scutellum entirely yellow, 

 co\ered with jiale setae; mesojihragma and postnotum 

 lilack, the latter somewhat reddish, greyish tomentose. 

 Pleura (pi. 4, fig. 6) black, forel)order between the front 

 coxae and the iiunieral calli brownish, possessing con- 

 spicuous straw colored spots as follows: one large spol 

 covering the entire jxisterior half of the mesopleuron 

 and in reality a continuation of the elongated spot im- 

 mediately in front of the siiture; one small transverse 

 oblong spot on I he upper end of the sternopleuron, and 

 one large spot on the metapleuron, as well as the s|)act' 

 just below the latter spot. All tiie bristles blackish 

 brown : nolojileural 2, rather strong butshort; supra-alar 

 1 : 2, the anterior weak and short, the first posterior 

 strong and longer than any others, the second at nearly 

 the same le\el as the prescutellars; humeral wanting; 

 one ])air of sciitellars; mesopleural 1. ]iteropleural \erv 

 weak. 



Abdomen (pi, 4, fig. S) a little longer than the tiiorax, 

 yellowish brown, with three black transverse bands and 

 one concc)lorous median longitudinal stripe, the first 

 band being broadest and situated on the anterior 2 :; 

 of first tergum, the second at the middle of the second 

 tergiim, the third on the anterior border of the third 

 tergum. all these bands lieiiig united at the lateral 

 margins; the median stri|)e from the third band ex- 

 tending nearly to apex; two apical tcrga with lilack 

 lateral stri[)es but not attaining apex; third tergum 

 black with one pair of yellow spots on posterior half, 

 no ciliation on posterior margin; the so-called shining 

 spots on apical tergum subciuadrate, somewhat brown- 

 ish, densely covered with very minute brown jiubes- 

 cence. Underside pale yellowish with a rather broad 

 blackish median longitudinal stripe which is distinct 

 only on the two a])ical sterna, the anterior median 

 jjortion somewhat reddish. Abdominal jiubescencc 

 _yellowish. 



Wings (pi. 4, fig. 1) without the supernumerary lobe, 

 R4+.5 with one row of distinct rather sparse and reclinate 

 bristles distributed from base to middle of last section 

 of the vein; anal cell rather short and nearly as long 

 as the apical sections of the anal vein, the ai)ical pro- 

 k)ngati()n as long as the cell |)roper. Blackish costal 

 band entire, nearly the same width throughout: anal 

 cell rather faintly brownish. Halteres whitish. 



i^egs yellowish white, tibiae and subapical spot of 

 femora blackish brown, a])ical three segments of tarsi 

 somewhat brownish. Front legs (pi. 4, fig. 11): femora 

 with an ill-defined brownish spot on outside about the 

 middle of the ])osterior half, dorsal margin with a 

 blackish pubescence, of which ajiproximately five near 



