88 THE CANADIAN ENTOMOLOGIST. 



their carcasses as long as they lay unskinned, which was often twenty-four 

 to thirty hours. For some time after the death of the animal, the 

 Hcematobice could be seen only with difficulty, concealed as they were by 

 the mosquitoes which were incredibly numerous, Hngering in clouds 

 upon the dead moose as long as any of its juices could be extracted. The 

 flies seemed to prefer the regions of the head, rump and legs where the 

 hair is shortest. It is highly improbable that they find a resting place 

 upon the horns of the moose. The male moose go thrashing about in 

 the underbrush with tempestuous energy. They use their horns during a 

 great part of the year to scrape away the bark from trees ; and they have a 

 way of winding them in among the bushes when a rival is near, as a 

 challenge. The females, as is well known, have no horns. The present 

 species is very probably indigenous, infesting as it does an animal not in 

 domestication ; and inhabiting such secluded inland portions of this 

 continent. The moose obtained by this expedition were all killed far 

 within the swamp, fifteen to twenty miles from firm land ; and it is only in 

 such places that this now rapidly disappearing animal can be found. This 

 region is rarely visited by white men, and the {q.\s Indians that venture 

 there wait until the surface of the fens is frozen over. It is not altogether 

 unlikely that this fly infests the caribou also. It was hardly possible to 

 observe its actions on the living moose; but we know that it lays its 

 eggs in the excrement, and in all probability it resembles H. serraia in 

 other habits as well. 



Professor Dyche heard no complaints from owners of stock on the 

 borders of the swamp of the ordinary Horn Fly, or of any similar fly. 

 The cattle are, however, tormented with mosquitoes, and smudges are 

 kept constantly burning to which they may run for relief. 



HoRmatobia aids, n. sp. Male. — Length 4-6 mm. Front narrow, 

 with concave sides ; central portion black with yellowish pollinose orbital 

 stripes ; sides of front further marked by a row of long, sparse, black 

 hairs. Antennae blackish-brown ; second joint sub-globular ; third joint 

 slightly longer than broad, with square corners, and slightly concave on 

 the inner side. Arista black, base enlarged. Pectinations long ; some- 

 times one or two hairs on inferior side. Face and cheeks black, sparsely 

 clothed with black hairs. Palpi long, porrect, gently spatulate, light 

 yellow, with black hairs. Proboscis brownish-black. Dorsum of thorax 

 greyish pollinose with yellowish tinge. Two very distinct black median 

 stripes and an interrupted lateral stripe on either side. Thorax and 



