36 c Canadian Arctic Expedition, 1913-18 
slightly sunk lines between the areas usually occupied by vittse in other species, 
the same areas slightly grey pruinescent. Fore tarsi without conspicuously 
long hairs, basal joint three-fifths as long as fore tibia and twice as long as second 
joint; fourth tarsal joint on all legs distinctly longer than fifth. Wings narrow, 
costa extending well round apical curve of wing but falling considerably short of 
reaching apex. 
Length, 6 mm. 
Tanypus, sp. 1. 
A pupa which may be that of the species described in this paper is very 
similar to that of monilis Meigen. It differs in having the thoracic respiratory 
organs more elongate, about 2-25 as long as thick, paler in colour, and with 
-a short apical rounded projection. All the abdominal segments have a dark 
brown line at incisions, both on dorsum and venter; the lateral marginal hairs 
are very fine and number one or two on each segment near base, the seventh 
segment has three stronger hairs on each side and the eighth has five or six 
stronger flattened hairs; caudal fins pointed at apices, with four or five 
flattened hairs on basal half of outer margin and a slight protuberance at apex, 
giving each fin a sharply pointed appearance. 
Length, 7 mm. 
Locality: Inland lake at Bernard harbour, Dolphin and Union strait, 
Northwest Territories, August 10, 1915 (F. Johansen). 
Along with this specimen there is one which evidently- belongs to the species 
described as PsHotanypus sp. in this paper. 
Psilotanypus, sp.? 
Pupa. — Testaceous, with the thoracic markings of the enclosed imago 
showing through. 
Head without tubercles between bases of antennae. Thorax smooth, 
the respiratory organs like those of Procladius concinnus Loew, but com- 
paratively broader (PL VII, figs. 10 and 11). Lateral margins of abdominal 
segments with narrow fiat hairs, each side of eighth segment with 5-6 hairs 
which are regularly spaced; apical processes very similar to those of Protenthes 
hellus Loew, but broader and less rounded at apices (PI. VII, fig. 5). 
Length: 7-8 mm. 
Imago. — Head yellowish testaceous, scape of antennse fuscous, antennal 
plumes largely fuscous. Thorax testaceous; dorsum with a centrally divided 
median, and 2 broad, anteriorly interrupted lateral vittse; scutellum black 
on base above; sternopleura entirely fuscous; mesopleura and metapleura 
including postnotum largely fuscous. Abdomen with each dorsal segment 
with a fuscous spot on each side posteriorly, the spots becoming progressively 
larger to apex of abdomen; segments 6, 7 and 8 each with a narrow fuscous 
band across base. Legs testaceous, the knees narrowly fuscous. Wings 
apparently with a dark area surrounding the cross-veins. 
Fore tarsi similar to those of occidentalis, from middle of basal joint 
to apex of fourth with rather long hairs; mid and hind tibiae and tarsi with 
moderately long hairs; fourth tarsal joint on all legs longer than fifth. Venation 
very difficult to make out, but the cross-vein like branch of radius between the 
first and third branches is not distinguishable, and the cubitus forks about 
midway from cross-vein to margin of wing; in occidentalis, the petiole of 
cubitus is very short. 
Length, 7-5 mm. 
Locality: From pond at Bernard harbour, Dolphin and Union strait, 
Northwest Territories, July 3, 1916 (F. Johansen). 
