56 c Canadian Arctic Expedition, 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 

 Wbllaston 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 antennas 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. (PI. VIII, fig. 17). 

 Posterior spiracles large, black, narrowly separated, structure as in PI. 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 PI. 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 

 behind 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 PI. 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 resemble 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 



