G21 



specially constructed field cages. Comparisons show that the value 

 of poisoned shorts is certain, while the application of poisoned bran 

 is of very doubtful benefit when judged from the aspect of cost and 

 results. The following mixture was found to be excellent : Shorts, 

 501b., molasses. 2 gals., Paris green, 1 lb., applied at the rate of 201b. 

 per acre. In this case no water was used. The addition of Paris green 

 in greater quantities does not warrant the extra cost. 



CJiRAULT (A. A.). A new genus and species of Trichogrammatidae 

 from the Philippines. — Canadian Entomologist, London, Ont., 

 xlvii, no. 7, July 1915, pp. 233-234. 



Pseudobrachi/sticha semiaurea, gen. et sp. n., is described from a 

 large number of specimens of both sexes reared from the eggs of 

 a Jassid, Hilda breviceps. Stal, in the PhiUppine Islands, in February 

 1915. 



Johnston (F. A.). Asparagus Beetle Egg Parasite. — Jl. Agric. Research, 

 Washington, B.C., iv, 15 July 1915, pp. 303-313, 1 plate. 



Experiments on the life-history of the Chalcid, Tetrastichus asparagi, 

 Crawf., parasitic upon Crioceris asparagi, L., are described. This 

 Tetrastichus is probably present in many localities in the north-eastern 

 part of the United States. It is attached exclusively to the asparagus T 



beetle, which it destroys both by devouring the eggs and by ovipositing 

 in them. The parasitised egg hatches, but the beetle larva after 

 reaching maturity and forming its cell, fails to pupate. There are 

 two or even three generations of this parasite annually and it is regarded 

 as an important enemy of the beetle. It does even more useful work 

 in devouring the eggs than as an internal parasite. Since the parasitic 

 larva passes the winter in the soil in the pupal cell of its host, it would 

 appear that the parasite might easily be transported from one place 

 to another in the soil which might surround a consignment of asparagus 

 roots. 



■QuAYLE (H. J.). The Control of Citrus Insects. — California Univ. 

 Agric. Coll. Expt. Sta., Berkeley, Circular no. 129. May 1915, 

 36 pp., 18 figs. 



Fumigation provides the best control for citrus scale-insects. 

 Detailed particulars of the method are given in this paper, including 

 fumigation dosage tables for sodium cyanide at the 75, 85, 100 and 

 110 per cent, schedules. Potassium cyanide from Germany was 

 formerly used, but sodium cyanide is now exclusively employed, 

 because of its lower cost and source of supply, it being now manu- 

 factured in the U.S.A. The sodium cyanide for fumigation is of 129 

 per cent, purity, on the basis of 100 per cent, potassium cyanide ; 

 it is usually obtainable in the form of egg-like lumps known as cyanegg 

 and costs from lid. to Is. 2d. per lb. The acid used is commercial 

 sulphuric acid of 66"^ Be., or about 93 per cent, pure, and costs from 

 -^d. to Id. per lb. In this process of gas production, water is added 

 to the acid for a threefold reason : the water dissolves the coating 

 formed on the cyanide by the acid ; its admixture with acid generates 

 heat, which promotes the production of gas ; it increases the volume 



