32 c Canadian Arctic Expedition, 1913-18 
Aedes (Ochlerotatus) nearcticus, n. sp. 
Female. — Proboscis long; palpi one-fifth the length of proboscis; setae 
long and abundant on head, thorax, coxce, femora, and abdomen, black, becoming 
whitish in old specimens. Mesonotum with coarse, narrow, curved, dark 
bronzy brown scales. Abdomen with broad basal segmental dull whitish bands; 
venter wholly grey-scaled. Integument entirely black. Wing-scales black, 
some white ones along the costa, subcostal, and first veins, rather numerous 
toward base. 
Male. — Similar to the female, with the usual sexual differences. Palpi 
about as long as the proboscis, the last joint slighidy thickened; end of long 
joint and last two joints hairy, Antennee weakly plumose. The genitalia have 
the side pieces conical, about three times as long as wide; apical lobe small, 
conical, nearly bare; basal lobe conical, with long setae on its lower side, shorter 
ones without, the margin sometimes seen as a crenulate tuberculous line running 
upward obliquely from the lobe. Harpes narrow, chitinized on the margins, 
the tips pointed in a blunt tooth. Harpagones with curved columnar stems, 
thickened at the basal half, hirsute, with two setae at the base, the outer part 
smooth; filament sickle-shaped, widened smoothly at base, the wide part 
tapering to the middle of the filament. Unci forming a pair of hooks simila. to 
the harpes, but smaller. Basal appendages very small, with stiff spines. 
Types and Locality: Bernard harbour, Northwest Territories, July 9, 1915 
(Frits Johansen), Canadian Arctic Expedition, No. 1395; d', with the same 
data, No. 1391. According to the notes of the collector, these were bred from 
pupae found in a pond (Rearing 59 A). Larvae were collected June 18, 1915, 
and adults emerged July 14-23. (Rearing 59). 
Also eighty-four specimens from the same locality, bred June 21 -July 1, 
1916 (Rearings 109, 121), and caught, the latter all 9 9. Apparently the same 
species from the following localities : 8 9 9 , West of Bernard harbour. Dolphin 
and Union strait. Northwest Territories, July 14, 1916 (F.J.); one 9, Young 
point. Northwest Territories, July 18, 1916 (F.J.) ; 3 9 9 , Herschel island, Yukon 
Territory, July 29, 1916 (F.J.); 6 9 9, cape Bathurst, Northwest Territories, 
July 26, 1916 (F.J.); 19 9 9, Konganevik, Camden bay, Alaska, July 4, 1914 
(F.J.); 1 9, Cockburn point. Dolphin and Union strait. Northwest Territories, 
September 5, 1914 (F.J.). Also bred July 22, 1914, from larvae collected at 
Collinson Point, Alaska, June 23, 1914, (Rearing 21). 
The species is allied to A. innuitus Dyar and Knab, of Greenland; but the 
male genitalia differ in the shape of the harpes and the filaments of the harpa- 
gones. Also allied to nigripes Zetterstedt from Lapland, for a discussion of 
which see Dyar and Knab, Ins. Ins. Mens., v, 167, 1917. 
Larva. — Head rounded, wider than long; antennae small, uniform, with 
sparse spicules, the tuft situated near the middle, composed of three short hairs. 
Head hairs single, at least the lower pair are so, the upper pair are broken in all 
the specimens; ante-antennal tuft in fours. Body with the skin glabrous; 
tracheae thick and uniform, narrowing only in the end of the airtube, where 
there is a short closing apparatus. Air-tube short, about two and a half times 
as long as the basal width, tapering outwardly; pecten of 11 to 16 teeth, usually 
about 14, the single tooth finely pointed and with a rounded branch, followed 
closely by a three- to four-haired tuft. Lateral comb of the eighth segment of 
ten to fourteen scales in a patch, the single scale elongate conical from an oval 
base, with long central thorn and few small lateral spinules. Anal segment 
with a dorsal plate reaching to about the middle of the side, its edge even but 
bulging a little posteriorly; barred area preceded by one or two hair tufts, the 
area situated posteriorly; dorsal hairs a long hair and three-haired tuft on each 
side. 
Locality: Specimens taken from a pond, Bernard harbour. Northwest 
Territories, June 28, 1915 (Frits Johansen), not isolated, but present in dom- 
inating numbers, so that they doubtless belong to the abundant species, 
nearcticus. 
