427 



habitat. The mesophyll spaces are reached through the stomata. 

 This hfe-cycle is that of the race and not the individual. The com- 

 plete embryonic and larval development of the individual does not 

 require more than 10 days, and the life-cycle from egg to egg may 

 be completed in 14 days. High humidity assists migration, but is not 

 essential to it. 



Infested plants and leaves should be burnt, and the use of infected 

 surface soil for boxes and pots should be avoided. The parasites 

 may be killed by immersing the plants in water heated to 50-52° C. 

 [122-126° F.] for five minutes. Exposure to dry atmosphere saturated 

 with carbon bisulphide for 24-48 hours kills the parasites, but affects 

 the appearance of almost all plants. 



SicARD ( — ). Descriptions d'Esp^ces et Vari6tes nouvelles de Cocci- 

 nellides de San Thom6. — Bull. Soc Portug. Sci. Nat., Lisbon, 

 viii, pt. 3, 1920, pp. 211-214. [Received 7th July 1921.] 

 The species described are Endochilus plagiatus, sp. n., Chilocorus 



pilosus, sp. n., Exochomus nigromaculatus , Goez. v. insulicola, n., and 



Rodolia seahrai, sp. n. 



Muller-Thurgau (— ). Zur Bekampfung des Heu- und Sauerwurms 

 mit arsensaurem Blei (Bleiarsenat). [The Use of Lead Arsenate 

 against the first and second Generations of Clysia amhigudla 

 and Polychrosis botrana.l — Schweiz. Zeitschr. f. Obst.- u. Wembau, 

 Frauenfeld, xxx, no. 13, 2nd July 1921, pp. 198-200. 

 Lead arsenate should only be used for spring spraying against vine- 

 moths and should be prohibited in July and August on the bunches. 

 Nicotine, which is the substitute in the later work, has many dis- 

 advantages ; it delays ripening and tends to confer a disagreeable 

 flavour. It may, perhaps, be possible to use Paris green or sodium 

 arsenate. The latter gave good results in a small trial at Wadenswil. 



GowDEY (C. C). Economic Entomology. — //. Jamaica Agric. Soc, 

 Kingstown, xxv, nos. 2, 3, & 4-5, February-May 1921, pp. 65-69, 

 113-118, 156-161. 



The lectures delivered at a course for Agricultural Instructors in 

 Jamaica, in January 1921 are here given. Their main object was briefly 

 to point out the chief principles of insect hfe, and to apply this know- 

 ledge to the control of insect pests. The various control methods, 

 poison sprays and contact insecticides, with directions as to use, 

 are described. 



Ehrhorn (E. M). Division o! Plant Inspection. — Haiuaiian Forester & 

 Agriculturist, Honolulu, xviii, no. 3, March 1921, pp. 67-68. 

 [Received 7th July 1921.] 



The pests intercepted in February 1921 included Argyresthia 

 cupressella on cypress trees from California and a Hemipteron among 

 seeds of Ficus from the Philippine Islands. 



Smith (L.). Report of the Virgin Islands Agricultural Experiment 

 Station, 1919.— Washington D.C., Sth November 1920, 16 pp. 

 4 plates. [Received Sth July 1921.] 



The principal industries of the American Virgin Islands and the work 

 of the station during the year 1919 are reviewed and described. 



