666 EXPERIMENT STATION RECORD. [Vol.41 



especially the two last named. The experiments show that the diet of Ano- 

 pheles larvae may be either heterogeneous or homogeneous, consisting of 

 mixed animal and vegetable materials, mixed vegetable materials, or indi- 

 vidual species of plants or animals. 



Some aspects of malaria control through mosquito eradication, C. W. Metz 

 (Pub. Health Rpts. [17. S.], 34 {1919), No. 5, pp. 1G7-1S3, figs. ^).— This discus- 

 sion relates to drainage, oiling, and accessory measures. 



The experimental infection in England of Anopheles plumbeus with Plas- 

 modium vivax (sporoboites in salivary glands), B. Blacklock and H. F. 

 Caktee [Ann. Trop. Med. and Parasitol., 13 {1919), No. 2, pp. 187, i88).— Two of 

 five mosquitoes fed on a volunteer patient suffering from simple tertian ma- 

 laria acquired in Saloniki were found to be infected. In the first, which died, 

 12 oocysts were found in the gut, some being in an advanced state of de- 

 velopment. The other was killed and Infections of hot gut and salivary 

 glands were found. Both glands were infected with sporozoites in large 

 numbers, the distal extremities of the lobes being chiefly involved. Thirty- 

 six oocysts varying in size from 18 to 30 fi have also been obtained in the 

 gut of a female killed on the thirteenth day after the infective feed and kept 

 at laboratory temperature. 



Variations in the length of the flaxseed stage of the Hessian fly, J. W. Mc- 

 CoLLOCH (Jour. Econ. Ent., 12 {1919), No. S, pp. 252-255).— The author finds in 

 rearing 7,461 flies in Kansas from collected material that the average time 

 between collection and emergence was 118.2 days, with extremes of 2 and 

 1,0S3 days. It was found that 68.4 per cent emerged during the first month 

 and 98.9 during the first year, while 1.1 per cent did not emerge until after 

 the first year although subject to the same conditions. One Hessian fly from a 

 clump of wheat collected May 8, 1915, emerged May 7, 1919. Allowing ap- 

 proximately a month for the fly to reach tiie flaxseed stage, this gives a 

 life cycle of 49 months. 



The white grub or grass root beetle (Scitala pruinosa), W. W. Feogqatt 

 (Agr. Qaz. N. S. Wales, SO {1919), No. 7, pp. 505-508, figs. 2).— This species, 

 which has an extensive range along the southern and eastern coast of Aus- 

 tralia, often destroys large areas of cereal crops and grass. 



Observations on wingless May beetles, R. A. Vickery and T. S. Wilson 

 {Jour. Econ. Ent., 12 {1919), No. 3, pp. 238-247, pU. 2).— These observations re- 

 late to Lachnosterna cribosa and L. farcta in Texas, where they caused 

 serious damage to crops during the spring of 1918. 



Experimenting with ladybugs {Better Fruit, 14 {1919), No. 1, p. 14). — It is 

 reported that 300 lbs. of ladybird beetles stored at Walla Walla, Wash., dur- 

 ing the winter and spring had been liberated in the fruit-growing districts of 

 that section up to June 5. It is estimated that they would cover 2,000 acres 

 of orchards and grain fields. District horticultural agent E. C. Wood reports 

 that the beetles begin to colonize in the mountains in July and remain in 

 colonies during the winter, and can be gathered for a considerable period in 

 the fall and for a period of 10 days during the month of April. In experi- 

 ments in keeping the ladybird beetles in storage during the winter, those kept 

 in ordinary storage showed a loss of about one-third, while those kept in cold 

 storage showed practically no loss at all. 



Japanese flower beetle, W. H. Goodwin {Jour. Econ. Ent., 12 {1919), No. S, 

 pp. 247-252). — This is a brief discussion of the occurrence of Popilia japonica 

 In New Jersey. Details are given of the eradication work being carried on In 

 the infested territory, which lies between Moorestown and Riverton and at 

 present covers some four or five thousand acres of very productive sandy loam 

 farms. 



