134 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



not very pronounced, and only visible, under a moderate magnification, 

 on the pale stripes, though more conspicuous on posterior and lateral mar- 

 gins; scutellum with decumbent golden pilosity and upright yellowish 

 hairs; pleurse bare except for the usual tuft below wing base, which is not 

 conspicuous, and confined to upper angle. Basal abdominal fringe yellow, 

 other abdominal segments weakly haired. Legs strong; surfaces with 

 golden pile, and scattered black hairs, which are most conspicuous on dor- 

 sal surfaces; fore tarsi slender; basal joint more than twice as long as 

 second; the paired apical hairs present on joints 1 and 3, but not conspicu- 

 ous; hind metatarsus not as broad as hind tibia, and distinctly longer than 

 the other four tarsal joints together; claws trifid, wing venation normal. 

 Length, 1 .5 mm. 



Type: Cat. no. 15958, U. S. N. M. 



Locality: Devils River, Texas, May 5, 1907, at light, (Bishopp 

 and Pratt) 



Female: In color very similar to the male, but the yellow is more pre- 

 dominant. The frons and face are thickly covered with a pale lavender- 

 gray pollinosity; the antennae are slightly darkened at base; and the palpi 

 are black. Mesonotum with the appearance of having three deep black 

 stripes on a brownish-yellow ground, the intervening spaces covered with 

 thick pollinosity similar to that on frons, and the lateral margins also dis- 

 tinctly pollinose; pleurae-black, anteriorly and posteriorly yellow-brown, 

 with silvery pollinosity; scutellum brown, gray pollinose, post-notum 

 black, with silky lustre. Abdomen with basal scale yellow; segment be- 

 low scale silvery, on apex, laterally; the other segments yellow, more or 

 less obscured with brown, and with three rows of black spots. Legs col- 

 ored as male. Wings similar to male. Halteres yellow. Frons convergent 

 anteriorly, at upper angles almost twice as wide as at lower; surface hairs 

 sparse, pale; face distinctly longer than broad, its breadth slightly more 

 than equal to breadth of frons at lower margin, haired as frons. Mesono- 

 tum with the pilosity very short, close and hairlike, yellow in color; 

 scutellum with distinct, decumbent yellow pilosity and longer upright yel- 

 low hair. Basal fringe of abdomen short, yellow. Legs haired as in male ; 

 claws simple. 



Length, 2 mm. 



Same data as males. One specimen. 



Another specimen with label, Victoria, Tarn., Mexico, Decem- 

 ber 10, (F. C. Bishopp), though smaller agrees in other particulars 

 with the allotype. , I do not know of any recorded occurrence of 

 Simulium at light, and it seems strange that species which nor- 

 mally prefer the sunshine should be attracted in this manner. 



