76 PROCEEDINGS OF THE NATIONAL MUSEUM. VoL. 62. 
United States Records. 
None. 
AEDES (HETERONYCHA) ALBERTAE Dyar. 
Aédes albertae Dyar, Ins. Ins. Mens., vol 8, p. 12, 1920. 
A large blackish mosquito with ringed legs. Mesonotum clear 
gray on the sides, a little yellowish; a broad red-brown band in 
the center and posterior short side stripes. Abdomen black above, 
with narrow basal segmental white bands, widening to triangular 
spots on the sides; venter whitish, with posterior segmental black 
bands and a narrow median black line. Legs black with white 
scales intermixed, the femora and tibiae pale below; tarsi black, 
with white rings at the bases of the joints, those on the hind legs 
broad. Wing scales wholly dark. 
This form, considered to be a race of stimulans, develops in early 
spring ground pools, having been taken in the same pool with 
timpiger. ‘The larva differs slightly from that of stimulans proper. 
Distribution.—Province of Alberta, Canada. 
United States Records. 
None. 
AEDES (HETERONYCHA) STIMULANS Walker. 
Culex stimulans WALKER, List Dipt. Brit. Mus., vol. 1, p. 4, 1848. 
Culicida subcantans Frit, Bull. 97, N. Y. State Mus., p. 448, 1908. 
A rather large brown mosquito with ringed legs. Mesonotum yel- 
lowish gray on the sides, a broad reddish brown or dark brown band 
in the middle, joining the short posterior stripes. Abdomen black- 
ish, with basal segmental white bands, widening in the sides, and 
some white scales on the apices of the segments also; venter whitish, 
with a row of black dashes on middle line. Legs black, with many 
white scales intermixed on femora and tibiae, the tarsi with white 
rings at the bases of the joints, broad on the hind pair. Wings 
with black scales, many white ones intermixed, especially along 
costal region, but also on the other veins. There are no reliable 
color differences between this and excrucians and fitchii. 
The winter is passed in the egg state, the larvae developing in 
river pools, which have been overflowed by high water. This 
species, with the other two mentioned, is common through the north- 
ern forests; but it is not possible to determine one from the other 
by the females alone, which makes exact records scarce. 
Distribution.—Northern forests, from New England to Canada. 
United States Records. 
MASSACHUSETTS: West Springfield, April 18, 1905 (F. Knab). 
Mount Holyoke, April 15, 1905 (I. Knab). 
