56 c Canadian Arctic Expeditio7i, 1913-18 
I have no doubt that the specimens before me, all of which were taken from 
caribou, belong to tarandi;. 
Localities: Read island. Dolphin and Union strait, southern side of 
Wollaston peninsula, Victoria island. May 4, 1915 (D. Jenness); Bernard 
harbour, Northwest Territories, May 21, 1915 and Richardson sound, Corona- 
tion gulf, between Richardson island and Victoria island, March 21, 1916 (F. 
Johansen). 
The mouth-parts of this species are very much aborted, the chitinized 
hooks so prominent in the larvse of Gastrophilus being entirely absent. The 
only chitinized portions of the cephalopharyngeal skeleton that I find by dissec- 
tion are two short rods that connect with the oral opening on its sides, and a 
poorly chitinized plate which covers the upper portion of the mouth and shields 
the opening of the oesophagus. The larvse of Hypoderma and those of this 
genus are very similar, the only noticeable distinction being in the spinal arma- 
ture of the body — the spines on dorsum of Hypoderma being much stronger than 
those on venter, whereas in (Edemagena they are of equal strength. 
The antennae in (Edemagena are small, their bases blackened, the distance 
between their bases about four times the width of their diameter; immediately 
above the antennae there is an irregular transverse series of strong thorns, 
the bases of which are black and the apices yellow. Each segment has a circle 
of strong backwardly directed thorns anteriorly and another of much weaker 
forwardly directed ones posteriorly, both of which are interrupted at the trans- 
verse depressions which run the entire length of the body. (PL VIII, fig. 17). 
Posterior spiracles large, black, narrowly separated, structure as in PL' VIII, 
fig. 14, the minute pale dots more regularly rounded than in drawing. 
Length in final stage, 25 mm. ; width, 10-12 mm. 
Cephenomyia Latreille. 
There are several larvse of a species from the nasal passages of caribou 
which I identify as belonging to this genus. I can not identify the species 
from the material before me, but possibly it is undescribed in the imago stage. 
Cephenomyia, sp. 
Larva. Whitish testaceous, the spinose armature black or black-tipped; 
posterior spiracles and mouth-hooks black. A few dots on segments of abdomen, 
most conspicuous and numerous on apical three segments. 
Body much more slender than in (Edemagena, slightly tapered at both ex- 
tremities. Mouth-parts well developed, dorsal view as in PL VIII, fig. 16, the hooks 
long and slender, curved, and sharp at apex. Each segment of body with stout, 
backwardly directed thorns on anterior half; posterior half of each dorsal seg- 
ment bare on greater portion of its width, with two small oval swellings on 
each side, caudad of which there is a transverse series of stout thorns; mesad 
of these swellings, on each side, there is another, less conspicuous swelling 
l)ehind which are no thorns; ventral segments similar to dorsal, but the sub- 
median swellings are as distinct as the lateral; posterior spiracles in a very 
distinct depression, the upper and lower margins of the segment produced, 
the latter very decidedly elongated, and both evidently capable of retraction 
so as to shield the spiracles; caudal view as in PL VIII, fig. 18. 
Length in final stage, 30 mm.; width, 9 mm. 
Locality: Bernard harbour. Northwest Territories, May 25, 1916 (F. Johan- 
sen). 
The larvse closely resem])le specimens before me named by C. H. T. Town- 
send Cephenomyia pratti Hunter. They differ, however, in having on 
most of the ventral abdominal segments a small median raised area, cephalad 
of the broad band of spines, upon which there are several strong spines. The 
