THE CANADIAN ENTOMOLOGIST 353 



Columbia. The habits, life-history, crops attacked, natural 

 enemies and methods of control are described. 



The Predacious Mite, Hemisarcoptes Mains Shiner and its 

 Relation to the Natural Control of the Oyster-shell Scale. By John 

 D. Tothill. (No. 3, pp. 234-239, 3 figs.). This mite, which feeds 

 on the eggs and sometimes the later stages of the oyster-shell scale 

 is believed to be the most important single factor in the natural 

 control of the scale in Eastern Canada. It has not been found in 

 British Columbia. 



Some Ladybird Beetles Destructive to Plant Lice. By Wm. A. 

 Ross. (No. 4, pp. 344-347, 2 figs.). This paper contains brief 

 descriptions and notes on the habits of the eight species of lady- 

 bird beetles which are most important in the natural control of 

 aphids on the Niagara Peninsula. Experiments were made to de- 

 termine the egg-producing capacity of each species, the duration 

 of the various stages and the feeding capacity of the adults as 

 measured by the number of aphids consumed in a given time. 



The Habits and Control of White Grubs in Manitoba. By 

 Norman Criddle. (No. 5, pp. 449-454). Mr. Criddle has made 

 a careful study of the four species of Lachnosterna found in Manitoba 

 {L. anxia, nitida, drakei and rngosa). He describes the general 

 life-history of these beetles and the peculiarities of the habits and 

 habitat of each species. He recommends ploughing between May 

 14 and July 1 at an average depth of 5 inches, this being a time 

 when none of the stages are below plough line and when the largest 

 number of all stages will be turned up, the majority being then 

 usually picked up by birds. 



He also discusses thoroughly the natural control of these 

 insects and the crops most suitable for sowing on infested lands. 



Some Bloodsucking Flies of Saskatchewan. By A. E. Cameron. 

 (No. 6, pp. 556-561, 6 figs). An interesting general account of 

 the more troublesome mosquitoes, black flies and horse flies of the 

 Saskatoon district. 



The Control of Lnsects in Ships by Steam. By R. C. Treherne. 

 (No. 7, pp. 668-669). Describes an instance where a vessel in- 

 fested with the rice weevil (Calandra orysoe) was freed from in- 

 festation by subjecting the hold to a high pressure of steam, after 

 failure by an all-night fumigation with sulphur. 



