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, coxae, 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 sligholy thickened; end of long 

 joint and last two joints hairy. Antennae 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 99. Apparently the same 

 species from the following localities: 899, 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.); 699, cape Bathurst, Northwest Territories, 

 July 26, 1916 (F.J.); 19 99, 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 nigri/pes 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. 



