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

152 MOSQUITOES OF NORTH AMERICA
AEDES ALDRICHI Dyar and Knab
Aedes aldrichi Dyar and Knab, Proc. U. S. Nat. Mm., 25, 57.
1908.
Fende. Length 4.5 mm.; wing 3.5 mm. Proboscis slender, black.
Occiput black, with narrow white scales, cheeks with broad flat white
scales; nape with numerous erect pale yellowish forked scales. Meson-
otum black, with very narrow curved white scales, a broad divided
median stripe and small subdorsal posterior stripes of bronzy-brown
scales. Abdomen black with narrow basal white segmental bands,
the bands widening laterally. Venter clothed with white scales. Legs
long, brownish black, the femora white scaled beneath, the tibiae
and first tarsal segment largely pale scaled within. Wings uniformly
clothed with brown scales.
Male hypopygiunz. (Fig. 1, PI. XV.) Side-pieces three times as
long as wide; apical lobe rounded, rather prominent, clothed with
few small, slightly retrorse setae; basal lobe large, slightly expanded
apicaly, clothed with numerous, short, stout setae and a broad curv-
ing spine arising at the basal cephalic margin. Clasper long, medianly
expanded, finely pilose. Claspette with stout, pilose, cylindrical stem,
somewhat constricted beyond the middle; at the point of constric-
tion arise two short setae; filament short, broadly expanded in the
middle. Mesosome a short sylinder, somewhat constricted at the
middle; open along the mid-ventral line, closed on the dorsum and
at the base. Lobes of the ninth tergite short, narrowly separated and
each bears four to five stout spines.
Larva. Length 8 mm. Head wider than long. Antenna slightly
tapering, indistinctly spined; tuft small, situated well before the mid-
dle. Head hairs usually in twos though the upper may be single.
Anteantennal tuft multiple. Abdominal lateral tufts double or triple
on the first segment, double on the second to sixth. The eighth seg-
ment bears a triangular patch of about 22 to 24 scales. Anal seg-
ment broader than long, not ringed by the dorsal plate though it
extends to near the mid-ventral line; dorsal brush a long hair and a
multiple tuft on each side; ventral brush well developed with two or
three small tufts preceding the barred area. Air-tube stout, from two
to two and one-half times as long as wide; pecten of closely set teeth,
extending to about the middle of the tube; tuft multiple situated just
beyond the pecten and at the middle of the air-tube.
This species occurs in the western United States and Canada,
being principally found in the river valleys of the Rocky Moun-
tain watershed both east and west. Hearle states that the win-