568 SCIENCE PROGRESS 



Ent. Soc. Washington, 23, 193-202), who describes twelve 

 new species and three new genera, all of which were collected 

 from a deposit of dead leaves in Maryland on a single 

 occasion. 



Applied Entomology. — ^There is no falling off in the number 

 of new text-books that continue to appear and deal with 

 various aspects of the subject. H. T. Fernald's Applied 

 Entomology (New York, 386 pp.) is an all-round first-rate 

 elementary book. B. M. Underhill's Parasites and Parasitosis 

 of Domestic Animals (New York) devotes 70 pages out of 379 

 to insects. D. Rivas has brought out a comprehensive work, 

 entitled Human Parasitology (Philadelphia and London, 715 

 pp.), and the insects concerned are dealt with in about 100 pages. 

 F. W. Dry {Bull. Ent. Res., 12 [3], 233-8) contributes a note 

 on a trypanosomiasis in cattle, possibly transmitted by some 

 insect other than the Tsetse, since the latter was absent from 

 the district in the Kenya Colony of Africa under observation. 

 In a second note he calls attention to an obscure human disease 

 in the same country, which has a distribution showing a coin- 

 cidence with that of a small blood-sucking fly, Simulium neavei 

 Roub. W. S. Patton {ibid., 239-61) writes on dipterous larvae 

 which produce myiasis in man and domestic animals. By 

 means of characters afforded by the cephalo-pharyngeal 

 skeleton and posterior spiracles, a table is provided for the 

 identification of the myiasis-producing larvae, other than those 

 of the Q^stridse. The Imperial Bureau of Entomology have 

 recently issued a brochure of 65 pages entitled. An Abstract of the 

 Legislation in force in the British Empire dealing with Plant and 

 Diseases up to the Year 1920. R. J. Tillyard {New Zealand 

 Journ. of Agric, 23 [i], 1-15) describes the introduction of a 

 minute Chalcid, Aphelinus mali, from the United States into 

 New Zealand, for the purpose of controlling the Woolly Aphis. 

 The parasite is now regarded as successfully introduced, and 

 its economic value in reducing the number of its host is a 

 matter which the future can alone decide. K. M. Smith 

 {Fruit Grower, December 15 and 22, 1921) contributes a 

 very useful and well-illustrated article on the biology and 

 control of the Carrot Fly. It is remarkable that so prevalent 

 a species should have hitherto received so little investigation. 

 The introduction of the European Corn Borer into North America 

 is attracting the attention of the entomologists of that continent. 

 In a recent conference {Journ. Econ. Entom., 14, 453-5) the 

 matter was fully discussed and the seriousness of the problem 

 emphasised. The spread of the insect constitutes a menace 

 to the agriculture of North America, and its recent establish- 

 ment over large areas renders extermination wellnigh im- 

 possible. 



