1917] ECONOMIC ZOOLOGY ENTOMOLOGY. 849 



tion of this report by the author from information collected by means of a 

 questionnaire circularized throughout the world are described. 



The report considers the history and geographical distribution of locusts; 

 gives a list of 142 injurious species observed in different countries and the 

 locality in which each occurs, together with their food plants ; and discusses 

 fhe biology and habits of locusts and control organization in each country. The 

 methods of control are discussed under the headings of natural enemies and 

 mechanical, physical, and chemical methods. The work concludes with a dis- 

 cussion of an international understanding on the question of control, the fol- 

 lowing countries being reported as approving the principles of such an agree- 

 ment : Portugal, Spain, Italy, Austria-Hungary, Roumania, Greece, China, India, 

 Morocco, Tunis, Kamerun, Canada, the United States, Mexico, and Trinidad. 



A 24-page bibliography is included. 



Report on control work with the locust in TJrug'uay, R. Sundbekg et al. 

 (Defensa Agr. [Uruguay] Mem., 1916, pp. ^4, P^s. 51). — This report presents 

 the details relating to work in Uruguay during 1915-16 and includes numerous 

 large-sized colored maps showing the dissemination of and control work with 

 the locust. 



Experiments in locust control by means of Coccobacillus acridiorum in 

 Argentina, R. Kbaus (Centbl. Bakt. [etc.], 2. AM., 45 (1916), No. lS-25, pp. 

 594-599; abs. in Internat. Inst. Agr. [jRo?ne], Internat. Rev. Sci. and Pract. 

 Agr.. 7 {1916), No. 9, pp. 1383, 1384)- — This paper is based upon investigations 

 conducted by the author, as a member of a commission appointed by the Minister 

 of Agriculture of Argentina, with a view to repeating the experiments of 

 d'Herelle. 



Organisms, morphologically identical with C. acridiorum, were isolated from 

 the intestines of healthy locusts. The author was able to increase the virulence 

 of the coccobacillus of d'Herelle and also found that the same effect can be 

 obtained equally well with the micro-organisms from the intestines of locusts, 

 although only negative results followed the feeding of locusts upon such 

 organisms. His conclusions are as follows : 



" It is not possible to produce in the open field the epidemic infection and 

 the death of young locusts by spraying with a culture of coccobacillus, the 

 virulence of which has been increased by successive passages. It may thus 

 be concluded that this coccobacillus is a normal inhabitant of the intestine of 

 healthy locusts and that it only kills the latter when injected into the abdominal 

 cavity. By administering this bacterium to young locusts with food, no infec- 

 tion is obtained." 



Summary of locust work for the third quarter, 1916, F. W. South (Agr. 

 Bill. Fed. Malay States, 5 (1916), No. S, pp. 64-72).— This is a report of work 

 carried on in the Federated Malay States. 



A new Sericothrips from Africa, J. D. Hood (Bui. Brooklyn Ent. Soc., 12 

 (1917). No. 2, pp. 32-34). 



A new species of Corythuca from the Northwest, E. H. Gibson (Ent. News, 

 28 (1917), No. 6, p. 258). — Corythuca pitra, collected from the prairie sunflower 

 (BalsamsrMsa sngittata) in several localities in the northwestern United 

 States, is described as new. 



The tomato and laurel psyllids, E. O. EssiG (Jour. Econ. Ent., 10 (1917), 

 No. 4, pp. 433-444, pi. 1, figs. 2). — Studies of 2 of the 50 species described from 

 California, namely, the tomato psyllid (Paratrioza cockerelli) and the laurel 

 psyllid (Triosa alacris), have been made by the author and are here reported 

 upon. 



The pink and green potato plant louse. — A new pest for Ohio causing 

 serious losses this year, J. S. Houser (Mo. Bui. Ohio Sta., 2 (1917), No. 8, pp. 



