19 



nigrina, Eckst., nemorosus var. dorsovittatus, Vill.) ; .4. (0.) communis, 

 De G. {nemorosus, Mg., obscurus, Mg., lazarensis. Felt & Young, pahncni, 

 Edw.) ; ^. (0.) pullatus, Coq. var. jugorum, Vill. {mctalepiicus , Dyar, 

 ^a//u', Martini) ; ^. {Stegomyia) vittatus, Big. (5. s?f^ews, Theo.) ; and 

 C///t'.v- (Culex) apicalis, Adams [scrgenii, Theo.). The author also now 

 adopts Aedes {Stcgom.yia) argentcus, Poiret, for Stegomyia fasciata, F. 



Dyak (H. G.). The Mosquitoes of Canada. — Trans. R. Canad. Inst., 

 Toronto, xiii, pt. 1, 1921, pp. 71-120. [Received 22nd November 

 1921.] 



A key is given to the tribes and genera of Canadian mosquitos, and 

 also to the Canadian species of certain genera, including Anopheles. 

 The four Anophelines that occur in Canada are : A . ptinctipennis. 

 Say, A. walker i, Theo. (which may or may not be a malaria carrier), 

 A''.maculipennis, Meig. {occidentalis, D. & K.), and .4. quadrimaculatus, 



Say. 



Brief descriptions are given, with notes on the distribution and habits 

 of each of the 53 species dealt with. The genus most abundantly 

 represented is Aedes, but Cidex spp., though absent from the northern 

 forests, are found in the warmer, open country, and especially in cities 

 [cf. R.A.E., B. viii, 105; ix, 101]. 



The Thread Worm, Gongylonema hominis, introduced into Man by 



Insects ?—£■«/. New^s, Philadelphia, xxxii, no. 9, November 1921, 

 pp. 280-281. 



A case is recorded from Georgia of infection of the human mouth by 

 a species of Gongylonema, for which Stiles suggests the name G. hominis. 

 Similar infections are widespread among cattle, sheep, rats, etc. 

 Infection probably occurs by swallowing insects such as croton bugs 

 [cockroaches]. 



Jaarverslag der Malariacommissie voor Noordholland over 1920. 



[Annual Report for 1920 of the Malaria Committee for the l^ro- 

 vince of North Holland.] — Reprint from Verslagen en Meded. 

 Volksgezondheid [sine loco^, 1921, no. 3, 23 pp. [Received 21st 

 November 1921.] 



The Committee began work in December 1919 and investigated 

 inter alia the occurrence and habits of Anophelines in and around 

 Amsterdam, Haarlem and Zaandam. 



In summer these mosquitos occur nearly everywhere, especially in 

 buildings housing domestic animals, and also in dwellings. In autumn 

 outdoor conditions become unfavourable to both Anophelines and 

 Culicines. The males die, and instead of maturing eggs the females 

 develop the fat-body and no longer travel considerable distances. In 

 warm and sheltered surroundings they sometimes feed in winter, and 

 in one instance, during a sharp frost in December, at least 10 per cent, 

 of the Anophehnes captured indoors contained blood. Though this 

 case is probably exceptional, the difference in the case of Culicines is 

 marked, and Culex pipiens seems not to bite at all in winter. Stables 

 for horses were chiefly infested, while it was exceptional to find many 

 Anophelines in cowsheds. Dry and well-closed pigsties, however, 

 contained many. Stables near the centre of towns were less infested 

 than those at the outskirts. 



