NO. 3557 SUBGENUS CULEX—BRAM 107 
and also clothed with fine setae. Appendicles of the apical lobe as 
follows: two strong, straight, subequal, bluntly rounded rods followed 
by a straight, pointed seta; leaf very narrow, somewhat pointed at 
apex; two accessory setae present, one as long as leaf, the other broader 
and longer than the leaf. Dististyle normal. Tenth sternite crowned 
with a dense tuft of short, pointed spines apically and about seven 
spatulate, scalelike spines on the lateral, outer margins; basal arm 
rather long, distinctly curved; eight to 10 cercal setae present in a 
large patch on the lateral margin. External process rather narrow, 
eradually tapering to a blunt point; slightly exceeding the ventral 
cornu in length. Ventral cornu long and narrow, similar in size and 
shape to the external process. Median process with three to five 
strong, pointed, distinctly separated teeth. Basal process long, thin, 
straight, and bluntly rounded at the apex. 
Larva: Antennal tuft located in a constriction near the outer third; 
antennal shaft spiculate basally. Postclypeal head hair 4 short, single; 
frontal head hairs 5, 6, and 7 multiple, long, and barbed. Mentum 
with about 13 sharply pointed teeth; the apical tooth is longer and 
broader than the lateral teeth. Thorax glabrous. Comb with many 
scales in a patch; each scale rounded apically and fringed with sub- 
equal spinules. Siphonal index 4.5 to 5.5; five multiple siphonal tufts 
inserted in a line beyond the pecten. Pecten with 10 to 15 teeth on 
the basal third of the siphon; each tooth with one to five coarse barbs 
on one side. Anal segment completely ringed by the saddle, spiculate 
distally. 
MATERIAL EXAMINED.—A series of over 50 specimens from the 
United States and five adult males and associated terminalia from 
Mexico. 
Distripution.—Carpenter and LaCasse (1955) reported that this 
species ranges from southwestern Canada through the western, 
central, and southern United States and into Mexico. 
Culex (Culex) thriambus Dyar, 1921 
FIGURES 33a, 6 
Culex (Culex) thriambus Dyar, 1921a, p. 33. 
SysTEMATICS.— This species demonstrates affinities with Culex peus, 
C. interrogator, and C. stenolepis. It may be distinguished by the 
number and arrangement of appendicles on the apical lobe of the 
basistyle and by its characteristic and diagnostic external process. 
SALIENT CHARACTERS.—Adult female: See table 1. 
Male terminalia: Basistyle conical, slightly longer than twice the 
basal width; clothed with fine setae in addition to the normal, long 
setal pattern. Apical lobe of the basistyle prominent, undivided, 
