Carpenter et al.: Mosquitoes of Southern U. S. 



207 



inent thumb-like projection bearing short setae. Dististyle (Ds) a httle broader 

 medially, approximately two-thirds as long as basistyle; terminal claw (Ds-C) 

 slender, about one-fifth as long as dististyle. 



LARVA. (Fig .112). — Head broader than long. Antenna less than half as 

 long as head, spinose; antennal tuft multiple, arising near middle of shaft. 

 Head hairs: Preantennal (A) multiple, weakly barbed, barely reaching base of 

 antennal tuft; lower (B) single; upper (C) double; postclypeal (d) small, 

 branched; sutural (e), trans-sutural (f), and supraorbital single or double. 

 Upper lateral abdominal hairs double or multiple on segment I, double on II 

 to V and single on VI. Comb of eighth segment of numerous scales in a patch; 

 individual scale with apical spine almost one and one-half times as long as 

 subapical spines. Siphon about three times as long as wide; pecten of numerous 

 evenly spaced teeth on basal third of siphon; subventral tuft 3 to 4-branched, 

 inserted beyond pecten; anal segment longer than wide, with the dorsal plate 

 reaching well down the sides; lateral hair single; dorsal brush consisting of a 

 long lower caudal hair and a shorter multiple upper caudal tuft on either side; 

 ventral brush large, with several small tufts preceding the barred area; gills 4, 

 about as long as the anal segment, each tapering to a blunt point. 



DISTRIBUTION. — Mostly restricted to Northern United States, Canada and 

 Alaska. Southern States: Mississippi (52). Other States: Colorado (129); 



IXT-L 









Fig. 111. Acic& stimulans (Walker). A. Hind tarsus. B, Male 

 terminalia. C, Scutum and sculellum. 



