INSECUTOR INSCITI^ MENSTRUUS 83 



only a race of it. The principal differences are the larval head 

 hairs. The coloration of the mesonotum is not very variable, 

 though the dark brown stripes vary in width and distinctness. 

 The marking is easily abraded. The abdomen of the female 

 beneath frequently has paired apical black spots or bands as in 

 the male. The females as flying appear a somber colored 

 mosquito without prominent markings, the dorsal bands not 

 being conspicuous. They vary considerably in size. They 

 c'ome readily to bite by day in the woods and were frequent 

 about camp in the evening. Though seemingly eager to bite 

 they are rather deliberate in selecting a spot and easily dis- 

 turbed. 



Bred from early pools filled by melting snow. Fallen Leaf, 

 Lake Tahoe, California, latter part of May and first of June, 

 1916. The pools were clear, cold, and very transitory. 



This species occurs also in the Yosemite Valley, judging 

 from males bred from pupae taken in the Little Yosemite, 

 May 18, 1916. No larvae were found, all having transformed. 

 Another locality, presumably of this species, is : Summit, 

 Placer County, California, July 19, 1915 (H. G. Dyar). 



Aedes hexodontus, new species. 



Male. — Integument black. Head with pale straw-yellow 

 scales, flat and appressed on the sides, narrow curved on the 

 vertex, the black ground showing ; vertical bristles pale straw- 

 color, those along the eye-margins black ; erect forked scales 

 low on the neck, black ; median groove bare. Mesonotum with 

 narrow curved pale straw-yellow scales ; two brown bands 

 about five scales wide, of sm.aller dark brown scales, separated 

 by a space three scales wide of normal straw-colored scales on 

 each side of the median bare groove ; an angled lateral bare line 

 shows as a black mark ; no subdorsal brown stripes ; scales 

 about antescutellar space paler. Abdomen with narrow basal 

 segmental white bands ; venter white-scaled, apices of seg- 

 ments and median band black. Legs black, femora whitish be- 

 neath; tibiae and tarsi largely whitish scaled within. Length 

 of wing, 4.5 mm., the wing-scales black. 



Genitalia: Side pieces over three times as long as wide, 



