329 



NussLiN (0.) & Rhumbler (L.). Forstinsektenkunde. [Forest 

 Entomology.] — Berlin. Paul Parey, 1922, 3rd edn., xvi+568 pp., 

 457 figs., 8 portraits. Price 120 Marks : 14s. 8^. 



This third edition of Niisslin's "Textbook of Forest Entomology," 

 prepared by Dr. Rhumbler, contains an amount of new matter, inclu- 

 ding a section on insect morphology intended to assist the forester 

 in identification work. More attention is paid to the larvae of forest 

 pests, and biological control methods are discussed. Cryptococcus 

 fagi and other pests that have increased in Germany are dealt with 

 more fully than before. In spite of these and other additions, the 

 adoption of the editor's system of symbols for representing the life- 

 histories of insects and a new arrangement of the foot-notes have been 

 successful in producing a volume that is only a trifle larger than the 

 earlier editions, the valuable, practical features of which have been 

 cai'efuliy retained. 



Dash (J. S.). Troisieme Rapport de la Station Agronomique de la 

 Guadeloupe, juillet 1920 a juin 1921. — Sta. Agron. Guadeloupe, 

 Pointe-d-PUre, 1922. pp. 7-17. [Received 20th April 1922.] 



No new pests or diseases were observed during the year under review. 

 The most important insect attacking sugar-cane is the moth-borer, 

 Diatraca saccharalis, F., and very little is done to reduce its numbers. 

 More attention should be given to the collection of eggs and to the 

 destruction of all infested slips before the canes are mature. The larvae 

 of Diaprepes spp. and the Melolonthid, Cyclocephala tvidentata, F., 

 which attack the roots, are also increasing to an alarming extent, 

 and every effort should be made to keep them in check. 



Cotton was inspected in one locality, and was found to harbour 

 only a few individuals of Eriophyes gossypii (leaf blister mite). On 

 coconut palms the worst pest was the whitefly, Aleurodicus [Aleurodcs) 

 cocois, Curt. 



Feytaud (J.). Les Formes de D^veloppement de la Cochylis et de 

 I'Eudemis. — Rev. Zool. Agric. et App.. Bordeaux, xxi, no. 2, 

 h>bruary 1922, pp. 21-25^ 3 figs. 



The characters distinguishing the two vine-moths [Clysia amhiguella 

 and Polychrosis botrana] in their various stages are described. 



NiKOLSKY (V. v.). ripuHMHbi nepGABHweHifl JImhmhok AaMaTCKOM 



CapaHHM. [Reasons for the Migration of the Larvae of the Asiatic 

 Locust.] — TypK. CenbCKOe X03. [Separate from Turkestan Agric], 

 Tashkent, 1918, nos. 3 & 4, "March & June 1918, 12 pp. 

 [Received 22nd April 1922.] 



The migration of young hoppers of the Asiatic locust [Locnsta 

 migratoria, L.] is generally considered to be a march in search of 

 food, and the opinions of various writers on this subject are quoted. 

 It has also been noticed, however, that with certain locusts migration 

 is more or less systematic. From the author's observations it would 

 seem that instincts other than the want of food may influence these 

 migrations. The movement that does not stand in relation to the food 

 supply may occur during the first instar, whereas the majority of 

 authors record the migrations from the second instar. Many of the 



(6551) V 



/■ 



