38 c Canadian Arctic Expedition, 1913-18 
PupA, Similar to that of tentans. The second abdominal segment has a 
transverse line of minute chitinized spinules on posterior margin, and almost 
the entire dorsal surface covered with small brown scale-like eleva- 
tions, which are most conspicuous posteriorly; a rather long hair is present 
on each side of median line posteriorly, and the elevations are absent round the 
bases of those as well as on a number of small round areas on anterior half of disc ; 
segments 3 to 5 without transverse line posteriorly, but in other r^pects as 
second, though the elevations, or scales, become progressively weaker to fifth 
segment and are present only near posterior margin on sixth and seventh as two 
small brown patches; eighth segment with each postero-lateral angle armed 
with a chitinized process similar to that of decorus Johannsen. 
Length, 14 mm. 
Locality: Pool at Gollinson point, Alaska, June 22, 1914 (F. Johansen). 
Chironomus, sp. 3. 
Larva. This species differs from the previous one only in being smaller, 
11 mm., and in having a dark brownish vitta on dorsum of head, ancl the sub- 
median labial tooth attached to median one so that it appears more like a pro- 
tuberance from the side of the latter than a distinct tooth. 
Locality: Brackish pond, Bernard harbour, Dolphin and Union strait, 
Northwest Territories, August 4, 1915 (F. Johansen). 
Tany tarsus Van der Wulp. 
There are several imagines and some larvae of this genus in the collection. 
Tany tarsus, sp. 1. 
Five males in poor condition resemble in most particulars viridiventris 
Malloch. The thorax is black, abdomen fuscous, though probably greenish in 
life, and legs pale fulvous. The fore tarsi have no long hairs and the basal joint 
is about 1-5 as long as second. The wings are not in good enough condition to 
give an accurate idea of the venation. 
Length, 3-5 mm. 
Locality: Teller, Alaska, August 3, 1913 (F. Johansen). 
Tanytarsus, sp. 2. 
One male without fore tarsi. Larger than foregoing. Entirely black, 
including the legs, halteres, and antennal plumes. Wings with very short 
surface hairs; radius extending to beginning of apical curve of wing; cross- vein 
slightly before middle. 
Length, 4-5 mm. 
Locality: Lake Angmaloktok, Colville mountains, Wollaston peninsula, 
Victoria island, July 22, 1915 (D. Jenness). 
Tanytarsus, sp. 3. 
Larva. Orange in life; alcoholic specimens, greenish yellow, head brown. 
Base of antennae pedunculate; basal antennal joint about five times as long 
as thick, second joint about one-fourth as long as basal, third and fourth joints 
pale, their combined lengths not equal to length of second and distinctly less than 
that of the long pair of filaments at apex of second joint, the filament at apex of 
basal joint not longer than second joint; mandibles stout, with a rather strong, 
and not very sharp apical tooth, and three small teeth along inner margin: 
