a handbook of the mosquitoes of north america - Systematic Catalog ...

CULICIliI 127
cheeks with broad, flat white scales. Mesonotum black; a broad, dark
brown median stripe divided by a broad median line of yellowish-
brown scales; sides, anterior margin, and antescutellar space white
scaled. Some brown scales are frequently present on the sides, par-
ticularly in front of the antescutellar space. Abdomen black, each
segment with a broad basal band of white scales; venter clothed with
white scales. Wing scales black. Legs black.
A!la.le hypopygiwa. (Fig. 6, Pl. XI.) Side-pieces nearly four
times as long as wide; apical lobe long, slender, finger-shaped and
bears a few short setae on its inner face; basal lobe, very short,
slightly conical, with a row of rather stout spines crossing its apex
and one large, stout spine at the outer end of the row. Clasper long,
very slightly expanded in the middle. Claspette with long, stout,
slightly pilose stem ; filament short, expanded, pointed at the apex
and a prominent tooth-like projection near the base. Mesosome cylin-
drical, tapering, open on the median ventral side, closed on the dor-
sum and at the base. Lobes of the ninth tergite short, heavily chit-
inized and bearing numerous spines.
Larva. Length 8 to 9 mm. Head rounded, wider than long; an-
tenna cylindrical, spined all over, a short multiple tuft at the middle;
upper and lower head hairs single; anteantennal tuft multiple. Ab-
domen stout without many long hairs or tufts. Lateral tufts double
on the first to the fourth, single on the fifth and sixth segments.
Lateral comb of the eighth segment of 17 to 30 scales arranged in a
triangular patch. Anal segment longer than wide, the dorsal plate
extending half way down to the mid-ventral line. Dorsal brush con-
sists of a long hair and a multiple tuft on each side; ventral brush
well developed, long, with a few small tufts preceding the barred
area. Anal gills short, as long as the segment, lanceolate. Air-tube
about two and one-half times as long as wide. Pecten of closely set
teeth; tuft of three hairs, situated just beyond the pecten at the mid-
dle of the tube.
Aedes impiger, according to Dyar, is distributed throughout
the northern edge of the United States, from the Atlantic to
the Rocky Mountains, the forested Canadian region, and the
mountains of California. It is a rather rare species. The
adults are found in wooded areas till June or July.
AEDES DORSALIS Meigen
Cztlex dorsalis Meigen, Syst. Besch. Bek. Eur. Zweifl. Ins. 6,
242. 1830.