54 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 62. 
AEDES (HETERONYCHA) INTRUDENS Dyar. 
Aédes intrudens Dyar, Ins. Ins. Mens., vol. 7, p. 23, 1919. 
A medium-sized black mosquito, very fond of entering houses. 
Head with brown scales on the vertex, a narrow line of black ones on 
each side, and a patch of creamy ones below. Mesonotum with dark 
bronzy brown scales, the posterior lateral stripes often showing 
faintly blackish, with a slender light line within. Abdomen black, 
with basal segmental white bands, generally not contracted in the 
middle; venter whitish scaled. Legs black, the femora pale beneath. 
Wing scales dark. 
Liable to be confused with the abserratus form of punctor or the 
heavily suffused form of cataphylla, the male genitalia abundantly 
diagnostic in both cases, also similar to the unlined form of lazaren- 
sis, but that has always a pale margin to the mesonotum, lacking in 
intrudens. 
The winter is passed in the egg state. The larvae develop in early 
ground pools in spring, this being one of the especially early species. 
The adults are short lived, disappearing comparatively early in the 
season. This is the most troublesome of the forest mosquitoes, from 
its habit of entering houses. When large numbers get in, as often 
happens, sleep is difficult. No other forest species behaves in this 
manner. 
The mating habits of the males have not been observed. 
Distribution —Northern forests, Atlantic to Pacific; Europe (Ger- 
many). 
United States Records. 
New York: Karner, March 19, 1904 (E. P. Felt). 
Elizabethtown, April 23, 1905 (H. G. Dyar). 
MaAssacHusetts: West Springfield, April 18, 1905 (Dyar and Knab). 
Longmeadow, April 16, 1905 (Dyar and Knab). 
New HampsHireE: Dublin, May 23, 1910 (H. C. Stowell). 
Montana: Whitefish, June 16, 1921 (H. G. Dyar). 
AEDES (HETERONYCHA) DIANTAEUS Howard, Dyar, and Knab. 
Aédes diantaeus Howarp, Dyar, and Knas, Mosq. No. & Cent. Am. W. L, 
vol. 4, p. 758, 1917. 
Aédes serus Marrint, Arch. f. Schiffs- u. Tropenkr., vol. 24, Beih. 1, p. 96, 
1920. 
A medium-sized black mosquito. Mesonotum yellow, the two me- 
dian blackish lines distinct, narrow, sometimes joined into a single 
median stripe; side stripes generally weak. Abdomen black, the 
white bands obsolete dorsally, forming triangular spots at the sides 
at the bases of the segments; venter whitish, the segments black at 
their apices. Legs deep black, the femora white below, broadly so at 
_ base. Wing scales narrow, all dark. 
