SIMULIUM. 51 



brownish or yellowish; pleurae black, paler, brownish, posteriorly, 

 and with whitish pollinosity ; scutellum brownish. Abdomen velvety 

 black, sides of first segment, under basal scale, and apical two to 

 three segments whitish pollinose. Legs brown, tarsi darker. 



Head of the usual male form in this genus; face hairs pale; 

 postocular cilia pale, with numerous longer, intermixed black hairs. 

 Scutum with rather long, white, hairlike pilosity, which is most 

 closeW placed on margins; pleural tuft pale; scutellar hairs white. 

 Abdominal fringe brownish yellow; all segments with pale, rather 

 short, dorsal hairs, and long lateral hairs of same color. Legs with 

 pale hairlike pubescence which is longer than that of the legs of 

 female; claws trifid. The wing venation is as in female, but the 

 wings are vitreous. Halteres brown. 



Redescribed from the original specimens bred from same pupal 

 material as the female type. 



The larva and pupa of this species bear a strong resemblance to 

 those of venustum Say. The larva may be distinguished from that 

 of venustum by the absence of the short bristles from the apical 

 joint of the maxillarj' palpus, the larger size of the central tooth of 

 the labium as compared with the outer lateral one, and also the 

 presence of only three to four ventral lateral bristles. The pupal 

 respiratory filaments number six, but the pairs divide at very near 

 the base instead of, as in venustum, appreciably beyond the base. 



This species has the reputation of being a biter, but the onl}^ 

 record in the collection is that borne by one specimen from ^Myrtle, 

 Ga., April 3, 1906 (A. A. Girault)— "on Homo," "found sucking 

 blood from hand." 



Simulium. tamaulipense Townsend. 



The following is a copy of the original description by Townsend : 



$. Length, li mm. Near S. meridionale, but smaller and the outer oue on 

 each side of the three thoracic lines not curved outward at posterior end. Eyes 

 velvet black, face and front silvery; the front with usually a ti'ace of linear 

 black vitta in one specimen very distinct, in another entirely wanting. Antennje 

 yellowish, with a silvery covering. Thorax silvery, with three longitudinal 

 lines: the middle one longest, very narrow and linear; the outer ones heavier, 

 straight, slightly divergent posteriorly. Looked at directly from above, the outer 

 lines appear curved, outwardly convex. Scutellum and metascutum below 

 scutellum, both brownish in some lights but in others they seem to be wholly 

 silvery, the various i)ortions appearing different in color to the view at the 

 same time. Abdomen silvery, but the third and fourth segments wholly 

 brownish, sometimes with a round median silvery spot on each. Legs yel- 

 lowish, shaded with silvery, tarsi blackish or browniish ; hind metatarsi yellow- 

 ish, except at distal end. Wings clear, whitish, veins dilute pale yellowish. 

 TIalteres and wing bases pale dilute yellowish. 



Four $'s, Reynosa, Tamaulipas L^iexico]. A small si)ecies taken on car 

 windows of railway train. May 10th. 



Described from four dried specimens. 



