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 falhng 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 Psilotanypus sp. in this paper. 



Psilo tanypus, 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 (PI. VII, figs. 10 and 11). Lateral margins of abdominal 

 segments with narrow flat hairs, each side of eighth segment with 5-6 hairs 

 which are regularly spaced; apical processes very similar to those of Protenthes 

 bellus Loew, but broader and less rounded at apices (PI. VII, fig. 5). 



Length: 7-8 mm. 



Imago. — Head yellowish testaceous, scape of antennae 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). 



