66 PROCEEDINGS OF THE NATIONAL MUSEUM. you. 62. 
posterior lateral ones, usually both broad and distinct. Abdomen 
black with basal segmental white bands, often narrowed in the mid- 
dle; venter whitish scaled, with more or less black at the apices of 
the segments. Legs black, femora white below; knee spots white 
narrowly. Wing scales all black. 
The coloration of the mesonotum varies from the normal yellow to 
gray in the Yukon Valley (form borealis), and in another variety 
is more or less overspread with brown. The lines may be narrow, 
or obsolete, or much extended, in the extreme form rendering the 
whole mesonotum black. 
No colorational characters can be given to separate all forms of 
lazarensis from punctor, diantaeus, aboriginis, intrudens, etc. 
The winter is passed in the egg state, the larvae developing in 
early ground pools in forest, and at least in one case in flood pools. 
The males swarm after sunset at projecting branches of spruce trees 
and similar locations. The females are good biters, flying in most 
profusion shortly after dark. ‘This is to be considered a race of the 
European Aédes communis DeGeer. 
Distribution.—Northern forests, from Atlantic to Pacific, except 
the moist Pacific coast belt. 
United States Records. 
NEw York: Plizabethtown, June 11, 1904 (HE. P. Felt). 
Plattsburgh, April 20, 1905 (H. G. Dyar). 
New HamMPsHIRE: Mount Washington (A. T. Slosson). 
White Mountains (H. K. Morrison). 
Dublin, May (A. Busck). 
Montana: Belton, June 28, 1921 (H. G. Dyar). 
Glacier Park, July 3, 1921 (H. G. Dyar). 
ALASKA: Hagle (Army Medical Museum). 
Healy, June 27, 1921 (J. M. Aldrich). 
Camp 334, Alaska Engineering Commission, June 21, 1921 (J. M. 
Aldrich). 
Camp 827, Alaska Engineering Commission, June 12, 1921 (J. M. 
Aldrich). 
Pitchfork Falls, July 28, 1919 (H. G. Dyar). 
Skagway, July 8, 1919 (H. G. Dyar). 
AEDES (HETERONYCHA) ALTIUSCULUS Dyar. 
Aédes altiusculus Dyan, Ins. Ins. Mens., vol. 5, p. 100, 1917. 
A rather small blackish mosquito. Mesonotum dull yellow, with 
two narrow brown lines, varying in width, sometimes broad and ap- 
proximate; disk of mesonotum grayish behind. Abdomen black, with 
basal segmental white bands, narrowing on the sides; venter white, 
with black bands at the apices of the posterior segments. Legs black, 
the femora pale beneath. Wing scales all dark. 
The larvae occur in the early snow pools on mountain meadows, 
hatching long before the snow is melted. Larvae were found in a 
