346 



DusTAN (A. G.) & GiLLiATT (F. C). The Dock Sawfly. — Proc. Entom. 

 Soc. Nova Scotia for 1916, Truro, no. 2, January 1917, pp. 45-48, 

 1 plate. [Received 2nd June 1917.] 



While this paper was in the press. Bull. 265 of the U.S. Dept. of 

 Agric. was published [see this Review, Ser. A, v, p. 241]. The dock 

 sawfly, Taxonvs glabratus, Fall, {nigrosuma, Nort.), does most damage 

 in young orchards, where 100 per cent, of the larvae hibernate in the 

 fruit, as many as five being found in one apple. In old orchards, 

 however, 75 per cent, hibernate in soft dead wood, in old bark and in 

 crevices. The injury to the fruit is serious, as the entrance hole and 

 cell made by the larva are surrounded by a large area of discoloured 

 and decayed flesh. 



Brittain (W. H.) & Saunders (L. G.). Notes on the Rose Leaf- 

 hopper {Empoa rosae, Linn.) in Nova Scotia. — Proc. Entom. Soc. 

 Nova Scotia for 1916, Truro, no. 2, January 1917, pp. 48-51, 

 1 plate. [Received 2nd June 1917.] 



The rose leaf -hopper is not so serious a pest in Nova Scotia as it has 

 been reported to be in the North-west of America [see this Review, Ser. 

 A, iii, pp. 270], though the author considers it probable that injuries 

 due to it have been attributed to Empoasca mali (the apple leaf- 

 hopper). The chief enemies of both these species are probably egg- 

 parasites. A large proportion of eggs of Empoa rosae dissected from 

 their blisters have been found to be attacked by a minute Hymenop- 

 terous parasite, not yet identified. 



Brittain (W. H.). Notes on the Rosy Aphis {Aphis malifoliae, Fitch) 

 in Nova Scotia. — Proc. Entom. Soc. Nova Scotia for 1916, Truro, 

 no. 2, January 1917, pp. 51-55, 1 fig. [Received 2nd June 1917.] 



Aphis malifoliae (the rosy aphis) lays its eggs in smaller numbers and 

 less conspicuous places than the green aphis [A. pomi]. They are 

 usually all hatched by the first or second week in May and the stem- 

 mother reaches maturity during the last week in May or the first in 

 June. The reproductive period lasts from two to six wrecks, the 

 average number of young produced under insectary conditions being 

 184. Normally, in Nova Scotia there is only one complete generation 

 on the apple after the stem-mother, the third generation being winged 

 and migrating to the secondary host-plants, Plantago lanceolata and 

 P. major. Experiments point to the development of a winged third 

 generation being influenced by overcrowding. The summer forms on 

 the plantain are not so prolific as the spring ones on the apple, and 

 produce migrants in the sixth to ninth generations that return to the 

 apple. 



Sanders (G. E.) & Brittain (W. H.). The Toxic Value of some 

 Common Poisons alone and in Combination with Fungicides, on a 

 few Species of Biting Insects. — Proc. Entom. Soc. Nova Scotia for 

 1916, Truro, no. 2, January 1917, pp. 55-64, 11 tables. [Received 

 2nd June 1917.] 



The result of numerous experiments on larvae of the brown- tail 

 moth [Evproctis chrysorrhoea.] to test the killing power of arsenical 



