247 



were no deaths until the fifth day, when one nymph died, a few other 

 deaths occurring at intervals. C. acridiormn was found in the intestines 

 of some of the locusts at the end of three weeks, when the experiment 

 was discontinued. Twenty locusts were fed on sweetened bran-mash 

 to which a culture of CoccobaciUus had been added, ^\^th the result 

 that two died at the end of the first day, twelve were dead by the 7th 

 day and 15 on the 11th day. The remainder lived for 8 more days 

 after being removed to a clean cage. Experiments were tried on 

 specimens of M. femur-rubnim and a few examples of other species 

 in order to test whether the disease would spread rapidly from dead 

 or diseased individuals to healthy ones, but yielded no result. It 

 was found that M. bivittatus would feed on the dead insects, so a further 

 experiment was made with equal numbers of these two species placed 

 with dead locusts to test the effect of this cannibalistic tendency on 

 the spread of the disease. At the end of 8 days 80 per cent, of 

 M. bivittatus were dead, but only 20 per cent, of M. femur-rvbrum. No 

 difference was observed in the relative resistance between male and 

 female locusts, but nymphs were apparently more resistant than 

 adults, and no greater susceptibility was manifested by M. femur- 

 rubrum, M. bimUatvs, D. Carolina and S. curtipennis over any of the 

 others. It therefore appears that all common injurious locusts and 

 grasshoppers in Eastern Canada are equally susceptible to this disease 

 and that C. acridiorum is pathogenic to them all. 



Field experiments on these lines were also made, but without very 

 satisfactory results. The conclusion is therefore reached that under 

 Eastern Canadian conditions d'Herelle's biological method for the 

 control of locusts is not suitable. vShould the disease become established 

 its spread would be extremely slow owing to the non-migratory and 

 non-camiibalistic tendencies of the native species. The presence of 

 several native strains of a CoccobaciUus identical with or closely related 

 to C. acridiorum probably renders the locusts immune to a mild 

 infection of this virus. 



The second part of this paper deals with descriptive studies of 

 C. acridiorum and sixteen related native organisms. 



A bibliography of twelve volumes is appended. 



Marchal (P.). La Fourmi de I'Argentine {Iridomyrmex humilis, 

 Mayr). [The Argentine Ant (Iridomyrmex humilis, Mayr)].- — 

 Bull. Soc. Etude Vulg. Zool. Agric, Bordeaux, nos. 1-2 & 3-4, 

 January-February & March-April 1917, pp. 1-6 & 23-26, 3 figs. 



This paper is an extract from the author's account of his travels 

 in the United States [see this Review, Ser. A, iv, p. 488], deaHng wdth 

 Newell and Barber's work in connection with the Argentine Ant, 

 Iridomyrmex humilis, Mayr [see this Revieiv, Ser. A, i, p. 325]. 



DE JoANNis (J.). Chenilles de Lyonetia clerkella, L. (Lep.) minant les 

 feuilles de Prunus laurocerasus. [Caterpillars of Lyonetia clerkella, L. 

 mining the leaves of Prunus laurocerasus .1 — Bull. Soc. Entom. 

 France, Paris, no. 3, 1917, p. 85. 



A large number of caterpillars of Lyonetia clerkella were found 

 mining the leaves of Prunus laurocerasus in Morbihan. This is believed 

 to be the first time that this fact has been recorded. 



