S2 Proceedings of the Biological Societ]/ of Washington. 
8. Small species; scutum with broad lateral iridescent areas 
nitid'um Mall. 
Large "jpecies; witliout broad lateral iridescent areas on scutum . h 
!). Front femora and tibia? for the most part light colored 
townsendi Mall. 
Front femora and tibiie for the most part black . . chalcocoma n. sp. 
Simulium gaudeatum new si)ecies. 
Female. —Occiput black, with coarse black hair projecting from the 
nape; frons and face pale silvery grey, the frons flat, broad, nearly 
parallel-sided, bilobed over the antennjc. Antennae black. Palpi black. 
Scutum marked with j^elloM'', ferruginous red and velvet black; sides of 
the disk black, the extreme lateral margins rather broadly light j'ellow, 
a very broad light yellow zone along antei’ior margins and involving pro- 
thoracic lobes, divided at the middle by a broad black strip which merges 
with the sublateral black areas, the hind margins of yellow anterior zones 
concave; behind the anterior median black strip a broader stripe of 
ferruginous red occupying fully one-third the width of the scutum, limited 
at the antescutellar depression, which is also ferruginous, l)y a transverse 
wavy band of light yellow. Scutellum light yellow, with long black 
hairs. Dorsal vestiture of long, ])ale golden hairs evenly distributed, 
some erect very long black ones before scutellum. Postnotum blackish 
brown. Pleune blackish, grey pruinose, prothoracic portion luteous, 
with pale yellow hairs. Abdomen with the first segment yellow, the 
succeeding ones blackish with the posterior margins, particularly towards 
the sides, and the latei-al folds yellowish. Legs variegated, all the tarsi 
black throughout; femora black, pale brown at bases; anterior tibiffi 
white with l)lack apices ; middle and iK)sterior tibife brownish yellow on 
basal halves; in addition to the coarser black hairs there are finer pale 
yellow hairs on the femora and tibiae; first joint of hind tarsi l)road and 
long, longer than the tibia. Claws slender, with a minute tooth towards 
base in addition to the basal thickening. AVings clear, with red irides¬ 
cent spot in the anal area; venation normal; costa, first and second 
veins black, subcostal vein brownish. Ilalteres bright yellow, the base 
of the stalk darkened. 
Length. —Body about 2 mm.; wing, 8 mm. 
Peru, two females (C. FI. T. Townsend, No. 8092). 
Type. —Cat. No. 18,846. 
Closely related to S. bicoloratum INIalloch, but differs particularly in 
the ornamentation of the scutum, as well as in other details. 
Simulium dinellii (Joan). 
Melusina dinellii Joan, Bob iNIinist. Agric. (Buenos Aires), xiv, No 4 
pp. 868, 885 (April, 1912). 
Simulium hipunctatum, INIalloch, Proc. U. S. Nat. Mus., xliii, p 650 
(Dec. 31, 1912). 
