arr. 1. MOSQUITOES OF THE UNITED STATES—DYAR, 55 
Liable to be confused with the normal form of lazarensis, from 
which there is no marked distinction. The form of diantaeus with 
single dark stripe (serws) closely resembles the normal form of 
punctor but is more slender, the legs blacker. Male genitalia always 
diagnostic. 
The winter is passed in the egg state. Larvae in early ground pools, 
especially cold pools in spruce bogs; but in one river valley breeding 
in flood pools in summer. 
The males do not swarm, but attack the females singly as these are 
attempting to bite some warm-blooded animal. 
Distribution—Northern forests from Atlantic to Pacific, also in 
northern Europe. 
United States Records. 
New Hamrpsuire: Dublin, May and June, 1909 (A. Busck). 
Montana: Belton, June 23, 1921 (H. G. Dyar). 
AEDES (HETERONYCHA) IRIDIPENNIS, new species. 
A rather large black mosquito, with light yellow mesonotum. In- 
tegument black; mesonotum with light yellow scales, paired median 
and short posterior stripes black, broad. Abdomen black, with nar- 
row basal whitish bands, widening on the sides into triangular spots ; 
venter pale scaled, with interrupted median black line. Legs black, 
the femora white beneath for two-thirds. Wings iridescent, the scales 
black, narrow. 
Described from a single female specimen, type Cat. No. 25264, 
U.S.N.M. The species may be found to fall in Zaeniorhynchus when 
the male is known. Larvae and life habits unknown. 
Distribution —Arizona and probably southward, a similar speci- 
men having been taken in Colombia. 
United States Records. 
ARIZONA: Chiricahua Mountains, August 17, 1917 (C. H. T. Townsend). 
Group PUNCTOR. 
AEDES (HETERONYCHA) PUNCTODES Dyar. 
Aédes punctodes Dyar, Ins. Ins. Mens., vol. 10, p. 2, 1922. 
A medium-sized black mosquito. Mesonotum dark brown, with 
two median darker lines, generally illy contrasted or obsolete, and in- 
distinguishable in flown specimens. Abdomen black, with basal seg- 
mental whitish bands, narrowed in the middle somewhat; venter 
whitish, with sprinkling of black scales. Legs black, the femora whit- 
ish beneath; tibiae and first tarsal joint also more or less pale below; 
knee spots white. Wing scales black. 
The larva is unknown, but will doubtless be found to develop in 
early snow pools. 
Distribution.—Alaska, central coastal region, and lower Yukon. 
