THE CANADIAN ENTOMOLOGIST 263 



and friction in order to hatch, and the larvai experimented with failed to enter 

 the skin but succeeded in entering the buccal mucosa. 



The distribution of these flies in Canada, the habits of the adults and the 

 period of activity is also discussed. 



As a preventive measure against the attacks of G. haemorrhoidalis a nose 

 fringe is recommended, consisting of a leather band around the nose and cut 

 into strips long enough to cover the lips of the horse. An additional flap is 

 attached to the band to protect the nose, and a piece of canvas, extending 

 from the nose band to the throat, may be used to ward off attacks of G. nasalis. 

 Some New Species of Tachinid^ From India.— By John D. Tothill. Bull. 



Ent. Research, Vol. IX, pt. 1, May, 1918. Pp. 47-60, with 16 text figures. 



This paper gives descriptions and figures of eight new species of Tachinid 

 flies, which constitute the major part of a collection received from Dr. A. D. 

 Imms. They belong to the genera Gymnochaeta, Servillia (2 species), Gonia, 

 Paraphania, Chaetoplagia, Frontina and Lophosia. 



Some Notes on the Natural Control of the Oyster- shell Scale (Lepi- 

 DOSAPHES ULMi L.). By John D. Tothill. Bull. Ent. Research, Vol. 

 IX, pt. 3, March, 1919. Pp. 183-196, 7 figs, in text. 



This study is based on an examination of about 18,000 egg- masses collected 

 between September, 1916, and April, 1917, from representative places through- 

 out Canada. 



It was found that the most important single factor in the control of this 

 scale is the predaceous mite Hemisarcoptes mains Shimer, a species of European 

 origin, which feeds upon both the eggs and the growing scales. In some locali- 

 ties, e. g., Moncton, N.B., where the scale has been very abundant, it has been 

 almost exterminated by the mite. In British Columbia, on the other hand, 

 it has not yet been found. "As hundreds of the mites can be sent through 

 the mail on an apple twig it should be possible to colonize it in scale- infested 

 places and countries where it may prove to be absent from the local fauna." 



Other important factors in the control of the summer stages of the scale 

 are overcrowding of the scales and the Hymenopterous parasite Aphelinus 

 mytilaspidis LeBaron, which in one locality was found to have destroyed 75 

 per cent, of the scales. - E. M. W. 



(To be continued.) 



CORRECTION {APHID ID /E). 



I am obliged to Dr. A. C. Baker for the information that Heteroneura, 

 recently described by the writer in Canadian Entomologist, (1919, page 228) 

 as a new genus to include Aphis setarias Thos., is preoccupied. I am, therefore, 

 proposing a new name, namely, Hysteroneura, as a substitute for Heteroneura. 



John J. Davis. 



