26 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
at the bases of the segments. Legs dark brown, with obscure, nar- 
row pale rings, involving both ends of the tarsal joints; venter pale 
sordid, with dark bands at the apices of the segments. Proboscis 
entirely blackish. 
The male genitalia have the mesosome divided into two plates. 
The larvae are found in spring in cold bogs, apparently develop- 
ing from overwintering eggs, but nothing certain is known about 
the habits of the species. No observations of its biting are on record. 
The males are attracted rather freely to light. 
Distribution—Northern forests, in cold bogs southward to New 
Jersey. 
United States Records. 
New HAmpsuHrre: Center Harbor, May, 1902 (H. G. Dyar). 
Dublin (A. Busck). 
MASSACHUSETTS: Wilmington, July, 1910 (H. S. Barber). 
Springfield, May, 1903 (EF. Knab). 
CONNECTICUT: Suffield, May 12, 1903 (F. Knab). 
New York: Tupper Lake, August 16, 1905 (H. G. Dyar). 
McLean, July 9, 1910 (B. K. Miller). 
New JERSEY: Culvers Lake, May 29, 1908 (J. B. Smith). 
WISCONSIN: Saxeville, May, 1910 (B. K. Miller). 
Subgenus CULISETA Felt. 
CULISETA (CULISETA) ALASKAENSIS Ludlow. 
Theobaldia alaskaénsis LupLow, Can. Ent., vol. 38, p. 326, 1906. 
Culiseta siberiensis LupLow, Ins. Ins. Mens., vol. 7, p. 151, 1919. 
Theobaldia arctica EpwaArps, Bull. Ent. Res., vol. 10, p. 136, 1920. 
A very large blackish mosquito, Proboscis dark brown, palpi with 
small white tips at the ends of the joints. Mesonotum uniformly 
colored, without impressed lines, the vestiture of black and white 
narrow curved scales, appearing coarsely frosted. Abdomen black, 
with basal segmental white bands, the venter mostly whitish scaled. 
Legs black mixed with some white scales, femora whitish beneath, 
femora and tibiae with a white line on the outer side; tarsi with 
white rings at the bases of the joints, mostly small; but large on 
the second and third joints of the hind legs. Wings broad, the cross 
veins in line; scales black, mixed with some white ones along costa, 
forming tufts or spots at the bases of first, third, and fourth veins 
and the forks of second, fourth, and fifth. 
The male genitalia have the aedoeagus simple, the penultimate seg- 
ment without spines. 
The larvae live in grassy marshes, generally in river valleys. The 
adults pass the winter hiding in hollow logs and similar locations, 
and appear very early in the spring. The eggs are deposited in rafts 
on the surface of the water. The adults will attack man, but are 
never numerous or particularly troublesome. 
