170 



There is no doubt about the multiplication of Telrastichus in large 

 numbers, but faulty mating interrupted the multiplication of the two 

 Braconids ; the author has, however, since succeeded with the 

 multiplication of one of these latter. The Tetrastichus is the species 

 which Silvestri discovered in West Africa, but lost on the way home ; 

 it was considered by him as one of the most important parasites of 

 C. capifMa in West Africa, and its introduction is especially 

 recommended in his recent report. [See this Review, Ser. A, ii, 

 p. 316.] 



Ehrhorn (E. M.). Division of Entomology. — Hawaiian Forester & 

 Agric., Honolulu, xi, no. 12, December 1914, pp. 355-357. 



In the course of his report for October 1914, the author records 

 the fumigation of two imported European bay trees on account of 

 their being infested with Coccus hesperidutn. During the month the 

 following parasites were liberated from the insectary : — For horn-fly 

 [Lyperosia] and house-fly, 1,600 African horn-fly parasites, 2,000 

 Philippine Spala,mjia, 2,000 Philippine Pteromalids ; for fruit-fly 

 [Ceratitis capitata], 250 Galesus silvestrii and 750 Opius humilis. 



LiEVRE (A.). Rapport sur les essais d'un insecticide contre le puceron 

 lanigere, invent6 par M. Celestin Duval. [Report on the trials of 

 a woolly aphis insecticide invented by M. Celestin Duval.] — Jl. 

 Soc. Nat. Hortic, France, Paris, xv, July-December 1914, 

 pp. 516-519. 



The author was secretary of a committee in whose presence an apple 

 tree strongly infested with the woolly aphis was sprayed with a new 

 insecticide in August 1913, the inventor, M. Celestin Duval, using 

 an ordinary sprayer for the purpose. An hour later all the insects 

 wliich had been reached by the spray were dead ; no scorching was 

 noticed on the leaves. Trees which had been treated by the same 

 method 8 or 10 days before, were inspected and no living aphids were 

 seen. If, as declared by the inventor, no other treatment was carried 

 out, this method is certainly efficient and practical. In July 1914, 

 M. Duval pubhshed a pamphlet, " La destruction du Puceron lanigere," 

 containing the following formulae : — Potassium carbonate solution, 

 viz. : — Rainwater, 1 litre ; potassium carbonate, 4 grammes ; sul- 

 phoricinate of soda, 40 grammes ; methylated spirits, 20 grammes; 

 and tobacco extract containing 10 per cent, nicotine, 10 grammes. 

 This mixture is used on the leaves, young shoots or old w^ood. It 

 dissolves the wool and the insects are transformed into a thick paste, 

 which soon dries with a greyish appearance. 



During the two or three weeks before the leaves are about to fall 

 naturally, when there need be no fear of injuring them, the following 

 «nore powerful formula should be used, if any aphids still remain : 

 American potash solution : — Rainwater, 1 litre ; American potash, 

 iO or 12 grammes ; sulphoricinate of soda, 40 grammes ; methylated 

 spirits, 20 grammes ; tobacco extract containing 10 per cent, nicotine, 

 20 grammes. The aphids, though now covered with a thicker coat of 

 wax, are unable to resist this solution. At this time of the year, the 

 eggs which insure the continuation of the species have been laid in 



