NO. 1945. NEW DIPTEROUS INSECTS— MALLOCH. 651 



brown on lower half of middle portion, membranous portions with 

 longitudinal fold-like striations, in front of wing base a black streak 

 and immediately beneath wing base a round black spot on nearly 

 the level of the pleural tuft which is pale in color, scutellum opaque 

 yellow, posterior margui with long, upright, black hairs, disk with 

 yellow pilosity; postnotum yellow, with black, lateral, longitudinal 

 streak at base. Abdomen opaque j^ellow, brownish at apex, surface 

 hairs black, longest on apical segments, basal scale yellow, fringe 

 yellow. Legs yellow, tarei and apices of tibisB of forelegs, mid tarsi 

 except base of first joint, and apices of tibiss, most of basal and all 

 but base of second joint of tarsi of hind legs black or brown-black; 

 all legs with many scattered, short, and several long, upright, black 

 hairs, as well as close-lying pale pilosity; apex of basal jouit of hind 

 tarsi produced at apex on posterior surface, second hind tarsal joint 

 with basal scale and dorsal excision; basal joint with rather distinct 

 row of about 20 bristles on anterior surface, claws with small sub- 

 basal tooth. (See fig. 8.) Wings clear, thick veins yellow, radial 

 vein unforked, joming the costa very close to fu^t vein; a thick tuft 

 of black hahs at base of fii-st vein. Halteres yellow. 



Length. — 1-1 1 mm. 



Type and paratypes.—Csii. No. 15305, U.S.N.M. 



Nine females, Rio Charape, Peru, September 13, 1911 (C. H. T. 

 Townsend) . 



Resembles notatum Adams, but separable by the color of thorax, 

 and pilosity, and also the shape of claws. 



SIMULIUM TOWNSENDI, new species. 

 Plate 46, fig. 9. 



Female. — Frons black, thickly white dusted except on upper half of 

 center, raised somewhat, centrally, on upper half and on lower lateral 

 angles, the sides very slightly divergent posteriorly, surface hairs 

 black, confined to outer third on each side, face thickly white dusted, 

 as broad as frons at upper angle of eyes, distinctly but not gl-eatly 

 longer than broad, surface hairs black; antennae brown, basal two 

 joints and base of thii'd joint yellow, pilosity whitish; palpi black, 

 the hairs concolorous; postocular cilia mostly black. Scutum opaque 

 black with indications of a grayish bifid central stripe and a broader 

 one on each side, on the narrow curved stripe between those there is a 

 whitish pollinosity, which is very distmct and forms a large pear- 

 shaped spot on near to anterior lateral angle of scutum where the 

 stripe broadens; scutum and prescutum with black upright hairs, 

 which are short on the disk, and yellow scale-like pilosity which is 

 rather sparee and irregularly arranged though not forming groups; 

 sides of scutum gray dusted, prescutum yellow or brownish-yellow; 

 pleurae brown, darker anteriorly, bare except for pleural tuft, which 



