166 



Had WEN (S.). A Note on the Occurrence and Significance of Ano- 

 plielinae in B.C. — Proc. B. C. Entom. Soc, Victoria, B.C., no. 5, 

 January 1915, pp. 81-82. [Received 17th June 1918.] 



The Anopheline mosquitos are never as numerous in British Columbia 

 as the Culieines, and are often hard to find. One species only, 

 A. punctipennis, Say, occurs on the lower mainland, and this only 

 in small numbers and in spring, out of doors. During the summer 

 it practically disappears, to reappear in autumn on the walls of houses 

 and in cellars. A. maculipennis, a well-known carrier of malaria, 

 probably has the same seasonal prevalence as A. punctipennis and 

 was reported for the first time during the summer of 1915 in a part 

 of the province that is very hot and dry. The presence of this 

 mosquito does not necessarily imply the existence of malaria ; in 

 Eastern Canada the disease is now of rare occurrence, though A. maculi- 

 pennis is comparatively common. 



Had WEN (S.). A Description of the Egg and Ovipositor of Cuterebra 

 fontinella Clark (Cottontail Bot). — Proc. B. C. Entom. Soc, 

 Victoria, B.C., no. 5, January 1915, pp. 88-91, 7 figs. [Received 

 17th June 1918.] 



The egg of Cuterebra fontinella bears a general resemblance to 

 that of Gastrophilus equi, having a deep groove on one side showing 

 that it is meant to be attached to a hair, and probably moisture 

 and friction are necessary for the emergence of the larva, as in the 

 case of that species. The subsequent life-history of CuterebrinB' 

 larvae must differ considerably, however, since the larvae show a 

 selective faculty for different parts of the body. Thus C. ema.sctdator 

 selects the scrotum of Tamias striatus lysteri for its final habitat, 

 while another midetermined species is reported from the backs of 

 field mice. Two mature larvae were taken from the costal region 

 of a domestic cat, though probably this was not the natural host, 

 as the larvae may have been swallowed when the cat was feeding 

 on a squirrel. The larvae of C. fontinella found in rabbits show 

 no selective faculty for any special part of the body. 



A comparison of the eggs of the Oestridae shows that those of 

 Hypoderma bovis and H. lineatiim are smooth, attached by a j)edicel 

 and without an operculum. That of Oedemagena tarandi (reindeer 

 warble-fly) differs from these in the possession of a rudimentary 

 operculum. The egg of G. equi is curved, grooved and possesses an 

 operculum, strongly resembling in these respects the egg of Cuterebra 

 fontinella. Hence it is reasonable to suppose that the mode of entrance 

 of their larvae into their hosts is somewhat similar, a view which 

 is strengthened by the fact that rodents are continually licking 

 themselves. 



The reputed host of C. fontinella is Lepus artemisia (cottontail 

 rabbit), but possibly it has another one, probably a mouse, as no 

 parasitised rabbits have been found in western British Columbia. 

 Cuterebrine larvae have the habit of emerging from their host-animal 

 after it has been killed, in which respect they differ from those of 

 Hypoderma. A description of the ovipositor of C. fofUinella, which 

 is unusually short, concludes this paper. 



