1905] SMITH AND GROSSBF.CK— MOSQUITO l.AKWH 15 
together with larva; and pupa; of canadensis, sylvestris and Aedes fuscus. Two of 
the larvae were preserved in alcohol and the other three fell prey to some small 
Dytiscids which had been overlooked in bottom material. From the pupae one 9 
C. niveitarsis emerged May 17. Later collecting in the same pool where they 
occurred failed to turn out any additional material of this species, and from this 
it appears that it also is a single brooded, early spring form. 
The larva is a very stout, robust wriggler and measures 7-7.5 mm., in length 
to the end of the ninth segment. In color, it is grayish white, profusely mottled 
and shaded with brown. The head is about one and one half times as broad as 
long, and of a yellowish brown color. The posterior part of the verte.x is macu- 
lated with a dark brown crescent shaped spot and a smaller one each side of it. 
Six hair tufts of 6 or 8 hairs each arise from the anterior part of the vertex, four 
in the central part and one at the base of each antenna. The antenna is of mod- 
erate length, pale yellowish, becoming brown at the apical third, the surface 
covered with rather large spines and many smaller ones intermingled; the apex 
with one long and three shorter spines besides a little joint. The tuft is situated 
on the shaft considerably below the middle and consists of 8 or 10 hairs. The 
rotary mouth brushes are deep orange in color, with the hairs of the central part 
pectinated at their tips. The mentum is triangular in form, twice as broad as high, 
with nine blunt teeth on each side of the apex. The maxillary palpus is normal, 
with a large apical tuft, a stout basal joint, and hairs over the surface arranged in 
rows and patches. The mandible is normal in form, peculiar by its very blunt 
teeth. 
The thorax is rounded with slight lateral angles giving rise to moderate hair 
tufts: two very small tufts are also on the anterior margin. The dorsal surface 
is a little depressed and symmetrically blotched with brown. These markings 
differ as to shape, but always resemble two transverse bands, the anterior one 
broken in the middle. 
The abdominal segments are thick and robust, each with lateral tufts of two 
hairs each, except the anterior two, which usually have 4 or 5 hairs. The eighth 
segment has a large patch of small scales on each side, about 45 in each patch, 
arranged in three or four irregular rows. The individual scale is rather long, 
broadest in the middle, with a small apical spine, and lateral ones becoming 
very small basally. 'I’he anal siphon is yellowish brown, about three and one 
half times as long as broad, with the lateral rows of spines extending half the 
length of the siphon from the base; the single spines broad at the base with one 
large tooth, or with one or two smaller ones beside the large tooth. The ninth 
segment is almost square, largely covered by the chitinized saddle ; the double 
dorsal tuft and ventral brush moderate, the latter with two small tufts below the 
