440 



Jamieson (G. S.)- The Determination of Arsenic in Insecticides by 

 Potassium lodate. — Jl. Indus. Engin. Chem., [sine loco], x, no. 4, 

 1918, pp. 290-292. (Abstract in U. S. Dept. Agric. Expt. Sta, 

 Record, Washington, D.C., xxxviii, no. 9, 9th August 1918, 

 pp. 804-805.) 



The iodate titration method has been applied to determine the 

 total arsenic in arsenical insecticides or fungicides, and the results 

 have been compared with those obtained by the official iodimetric 

 method. The method is described in detail, with data as to the 

 determination of arsenic in several samples of Paris green and zinc 

 arsenite. The results of the test analyses agree closely with those 

 obtained by the official method. This accurate method is said to be 

 not only quicker, but simpler. The very definite and remarkably 

 sharp end-point, the great stability of the potassium iodate solution, 

 and the readiness with which it can be prepared, all indicate its 

 usefulness in place of the iodimetric procedure. 



DiCKERSON (E. L.) & Weiss (H. B.). Popilia japonica, Newm., a 

 recently introduced Japanese Pest. — Canadian Entomologist, 

 London, Ont., 1. no. 7, July 1918, pp. 217-221, 1 fig. 



A Scarabaeid beetle, which has been identified as Popilia japonica,. 

 Newm., was observed in southern New Jersey in August 1916, feeding 

 on the tips of Crataegus. Upon further examination, the beetles 

 were found to be abundant on weeds such as Polygonum virginianum 

 (smartweed), Tiniaria arifolium (tear-thumb), both belonging to the 

 Polygonaceae, as well as Ampelopsis quinquefolia (Virginia creeper) 

 and other weeds. In many cases the leaves were completely riddled 

 by the beetles. As the insect attacks Polygonaceae, it is feared that 

 it might, if allowed to spread, become a serious pest of such plants 

 as buckwheat, while its preference for Vitaceae constitutes a menace 

 to grapes. In Japan, the food-plants are string beans, peas, grapes 

 and peanuts, the larvae being found in the soil on the roots. The 

 larva winters in the soil and pupates in May or June, the beetles 

 emerging in July. Eggs are deposited singly in the soil and the larvae 

 moult several times before winter, the complete life-cycle occupying 

 one year. Remedial measures include jarring the beetles into a 

 dish of oil and water, and spraying with Paris green, lime and water or 

 Paris green and Bordeaux mixture, and by the use of Vaporite in the 

 soil. In New Jersey, infested weeds and nursery plants are being 

 treated with arsenic supplemented by hand-picking. 



Ferris (G. F.). Notes on Coccidae (Hemiptera).— Cawac^iaw Entomo- 

 logist, London, Ont., 1, no. 7, July 1918, pp. 221-22-5, 1 plate. 



This paper redescribes Cryptojcermes brasiliensis, Hempel, recorded 

 from Mimosa in Mexico. 



Braun (A.-F.). New Species of Microlepidoptera. — Canadian Entomo- 

 logist, London, Ont., I no. 7, July 1918, pp. 229-236. 



Among the species here described are : — Erineda aenea, sp. n., the 

 larvae of which feed in September on the ferns, Asplenium angusti- 

 folium and A. acroslichoides , in Ohio, their time of reaching maturity 



