361 



is to plough deeply in Jiuie the land on which the last brood has fed, 

 and to harrow thoroughly so as to break up the pupal cells and expose 

 the pupae to the cold. When on the tobacco, a practical method is 

 to apply the mixture of dry Paris green and lime given above, to 

 the centre leaves of each plant. 



Pkytometra {Plusia) orichalcca, the burnished brass moth, is apt to 

 be destmctive in the kitchen garden and frequc]itly in the field. There 

 are a number of broods during the year. The pupal stage, lasting 

 from 9-10 days, is passed in a cocoon on the food-plant. The latter 

 may be lucerne, Egyptian clover, maize, rape, radish, carrot, lettuce, 

 potato, and " black-jack " {Bidens pilosa). Severe outbreaks are 

 generally checked by disease, Tachinid flics and the white stork. 

 Spraying with arsenical compounds to which resin soap has been 

 added is effective. The soap is prepared by boiling 2 lb. powdered 

 resin with 1 lb. washing soda in half a gallon of water until a clear 

 solution is obtained ; this quantity is mixed with 25 gals, of the 

 spraying fluid. Edible plants should not be sprayed within three 

 weeks of the time when they are required for use. 



Richards (P. B.). Methods and Materials for the Control of Insect 

 Pests (Part 3). — Agric. BuU. Fed. Malay States, Kuala Lumpur, iii, 

 no. 5, February 1915, pp. 208-214. 



Arsenite of soda is a most elective stomach poison in dealing with 

 young locusts or army worm caterpillars. A solution consisting of 

 1 lb. arsenite of soda, 5 gals, w^ater, and 1| lb. molasses, should be 

 sprayed in early moniing on grass around or in front of the direction 

 in which the swarm is travelUng. Arsenious oxide is used in 

 poison baits for surface caterpillars and mole-crickets. A suitable 

 mixture consists of 2 lb. sugar, 1 lb. white arsenic, 6 lb. bran and 

 water to make into a stiff paste. Lead compounds form valuable 

 insecticides, but are poisonous to cattle. Lead chromate is used 

 at a strength varying from 1 lb. to 30-60 gals, of water ; the 

 foliage is not injured in any way. Red lead forms a good dusting 

 powder for yomig crops. Carbon compounds, such as naphthalene, 

 nicotine, extracts of quassia and hellebore, are used in the prepara- 

 tion of contact sprays. Naphthalene in the form of an emulsion 

 can be prepared by mixing a saturated solution of naphthalene in 

 kerosene with, a hot solution of soft soap. The stock solution is 

 diluted before use. The emulsion forms a suitable spray for 

 vegetables intended for immediate use, but has no value as a general 

 insecticide. 



Waterhouse (C. 0.). Descriptions of Two New Genera and New Species 

 of Mymaridae from Tasmania. — Trans. Entom. Sac, London, 

 pts. iii and iv, 27th February 1915, pp. 536-539, 1 plate. 



Selenacus turneri, gen et sp. n., Palaconeura turneri, gen. et sp. n., 

 P. interrapa, sp. n., P. evanescens, sp. n.^ all from Mount Wellington, 

 Tasmania, are described. These species may, perhaps, be associated 

 with some Homopterous galls which were very abundant where they 

 were taken. 



