SIMULIUM. 61 



upright, dorsal pale hairs, which are conspicuous on posterior surface 

 of fore femora ; fore tarsi not dilated, the paired apical hairs absent ; 

 hind tarsus of the normal S'unullum form; claws trifid. Surface 

 hairs and short bristles on wing veins brownish yellow. 



Redescribed from type specimen. Locality, Kansas City, Mo. 

 (C. F. Adams). 



This species belongs to the same group as virgatum Coquillett and 

 hunteri, new species. The male of the latter is unknown, and it is 

 possible that this may be identical with it, but it is not unlikely that 

 it may belong to a quite distinct species. There is very little re- 

 semblance between the males and females of any species in this genus 

 and it is difficult to associate them correctly. 



The early stages and the female are unknown. 



GROUP E. 



Species with two or four stripes on scutum; the stripes straight or 

 very slightly curved, white or pearlaceous pollinose. 



TABLE OF SPECIES. 



1. Stripes on scutum not curved ; seutellum with close-lyins: yellow pilosity ; 

 abdomen with rounded, dorso-central, opaque black spot on basal four 



segments lianiafoijotiim, p. 62. 



Stripes on scutum slightly curved; seutellum with very indistinct, 

 sparse, yellow pilosity ; abdomen with bases of all segments opaque 

 velvety black and apices with whitish polliuosity quadniHttalum, p. Gl. 



Sim^ulium. quadrivittatum, Loew. 



Female. — Black. Frons and face thickly covered with bluish-white 

 poUinosity; antennce yellow, distinctly browned from fourth joint to 

 apex; palpi brown-black. Scutum velvety, opaque black; two bluish- 

 white, slightly iridescent, pollinose stripes on the dorsum, which are 

 slightly dilated anteriorly and a little curved; posterior margin of 

 scutum, and lateral margins, as well as prescutum, similarly polli- 

 nose; pleurse with bluish-white pollen; seutellum opaque black; 

 postscutum with iridescent pollen. Abdomen black; basal four seg- 

 ments opaque, Avith bluish-white pollinosity on first segment below 

 basal scale and on the posterior lateral margins of next three; apical 

 four segments glossy black. I^-egs black-brown, yellowish as follows: 

 Bases of all tibia?; mid tarsi except apices of joints &nd last joint; 

 hind tarsi except apices of joints 1-3. Bases of all tibiae and of first 

 hind tarsal joint silvery. "Wings clear, basal veins brown, thick 

 veins yellow, thin veins colorless. Ilaltercs yellow, stalk black-broAvn. 



Parous slightly divergent-si'ded. not one-third the head width at 

 upper angle of eyes, almost bare of hairs; face one-third longer than 



