650 PROCEEDiyOS OF THE NATIONAL MUSEUM. vol.43. 



spicuous on anterior lateral angles; postnotum deep black with a 

 silvery sheen. Abdominal basal scale yellow, fringe long, yellow, 

 first segment yellow, darkened at apex, next three opaque, velvety 

 Dlack, apical four segments shining brown-black, sides of fifth yellow, 

 apical four segments with scattered pale, and numerous longer, black 

 hairs. Legs black, fore coxae, bases of all femora, and all tibiae except 

 apices yellow; all pale portions of legs with silvery, very short 

 pilosity, the black parts with black pilosity, the usual scattered, long, 

 black, upright hahs on all legs, basal joint of hind tarsus with pro- 

 longed apical flaplike process posteriorly, second joint of same tarsus 

 with scalelike basal process and dorsal constriction; claws with 

 minute tooth in addition to the basal tubercule. Wings clear, ^vith 

 a slight indication of grayish color at apex, costal vein black-brown 

 at base, becoming black shortly beyond base, subcostal vein yelio\\dsh, 

 apical portions of fii-st vein and radial vein black, costal vein with 

 short spinelike bristles and soft hairs, first and radial veins joinmg 

 the costa very close together and forming a conspicuous black thicken- 

 ing of the costa at about midway from end of subcosta to end of costa 

 which tapers ofl' to end of costa, venation normal. Halteres yellow 

 with base of stalk darkened. 



Length. — 2§ mm. 



Type.—Csit. No. 15304, U.S.N.M. 



One female, Rio Charape, Peru, September 13, 1911 (C. H. T. 

 Townsend) . 



This species is readily distinguishable from any other in the genus 

 by the remarkable coloration of the thorax and abdomen. I know of 

 no closely allied species already described. 



SIMULIUM BIPUNCTATUM, new species. 

 Plate 46, fig. 8. 



Female. — Frons black-brown with distinct, metallic, whitish dust- 

 ing, sides divergent, about three-fifths as ,wdde at above antennas as 

 at upper angle of eyes, surface hairs upright, black, widely placed and 

 evenly distributed, face almost as wide as frons at upper angle of 

 eyes, concolorous with frons, white dusted, distinctly longer than 

 broad, the surface haire black, sliorter and more numerous tlian those 

 on frons, antennse brown, yellowish or three first joints, palpi brown. 

 Mesonotum opaque, ochreous yellow, scutum with indications of a 

 divided central darker stripe and a broader, shorter stripe on each 

 side; in certain lights there is visible on the anterior part of the 

 division between the middle and lateral stripes, where they stop short 

 of anterior margin, a metallic white (or pearlaceous) elongate spot; 

 prescutum and scutum with distinct, black, close-ljing hairs which 

 are most distinct and longest on anterior and posterior margins, 

 pilosity regular and rather hair-like, golden yellow; pleurae yellow, 



