191T] ECONOMIC ZOOLOGY — ENTOMOLOGY. 661 



Grasshoppers and their control, H. C. Sevekin and G. I. Gixbestson {South 

 Dakota Sta. Bui. 172 {1917), pp. 552-588, figs. 15).— This Is a popular account of 

 grasstioppers, wtiich were unusually abundant in alfalfa fields in the greater 

 part of South Dakota In 1916 (though the most severe attacks occurred in the 

 western two-thirds of the State), and means for their control. 



Destroy the grasshoppers, T. D. Ukbahns {Mo. Bui. Com. Hart. Cal., 6 

 (1917), No. 7, pp. 2^9-253, figs. 4).— A popular account. 



Report on the great invasion of locusts in Egypt in 1915 and the meas- 

 ures adopted to deal with it, A. T. McKillop and L. H. Gough {Cairo: Min. 

 Agr., 1916, pp. X-\-72, pis. H, figs. 2). — It is stated that in 1915 locusts appeared 

 in the Nile Valley both from the west and from the east, as they apparently 

 did the previous year. Driving the locusts into small trenches and burying 

 them was found to be the best method of destruction under Egyptian con- 

 ditions. Contact insecticides are useful but not to the same extent. Stomach 

 poisons and Coccobacillus acridiorum were tested and found unsuitable for use 

 in Egypt. 



The several appendixes to this paper include Notes on the Migratory Locust 

 (1904) {Acridium peregrinum), by W. Cartwright (E. S. R., 16, p. 485); a 

 brief report on the cost of the locust campaign ; etc. 



New Thysanoptera from Florida, J. R. Watson {Ent. Neics, 26 {1915), No. 

 2, pp. 49-52, pi. 1; 27 {1916), No. S, pp. 126-lSS, pis. 2).— The second paper, 

 continuing previous work (E. S. R., 29, p. 354), includes descriptions of two 

 species and one variety new to science. The third paper presents descriptions 

 of three species and one subspecies new to science, and includes a key to the 

 North American species of Aeolothrips, Anthrothrips, and Liothrips. None of 

 the new forms is said to be of economic importance, although Aeolothrips 

 fioridensis n. sp. was taken from oats and Anthrothrips fioridensis n. sp. from 

 Indian corn, and Euthrips tritici projectus n. var. is a very common type in 

 Florida in blossoms of orange, tomato, roses, begonia, etc. 



An annotated list of the Thysanoptera of Plummer's Island, Md., J. D. 

 Hood {Insecutor Inscitice Menstruum, 5 {1917), No. ^-6, pp. 53-65). — The author 

 records the collection of 57 species representing 18 genera in addition to several 

 unidentified uniques from Plummer's Island, Md., in the Potomac River near 

 the District of Columbia, and 17 additional species taken within a few miles of 

 the island. 



Two new species of Dicyphus from Porto Rico, E. H. Gibson {Canad. Ent., 

 49 {1917), No. 6, pp. 218, 219). — Two hemipterans Dicyphus prasinus and D. 

 luridus, collected at Rio Piedras, P. R., where they are a source of injury to 

 tobacco plants, are described as new. 



The green bug (Toxoptera graroiniun) outbreak of 1916, E. O. G. Kelly 

 {Jour. Econ. Ent., 10 {1917), No. 2, pp. 2?S-248) .—This is a report of studies 

 made of the outbreak of this pest in Kansas in the spring of 1916. 



Plant lice injurious to apple orchards. — II, Studies on control of newly- 

 hatched aphids, II, P. J. Paekott, H. E. Hodgkiss, and F. H. Lathbop {New 

 York State Sta. Bui. ^31 {1917), pp. 53-79, pi. 1, figs. 4).— This report of life 

 history studies and experiments with apple plant lice {Aphis sorbi, [A.] Sphoco- 

 ryne avence, and A. pomi), conducted with a view to the establishment of efficient 

 spraying practices for the protection of bearing apple orchards, is in continua- 

 tion of that previously noted (E. S. R., 35, p. 757). 



The more important results and applications from these efforts are dealt 

 with under the headings of classification of newly-hatched larvae and stem 

 mothers of the first brood, seasonal behavior of aphids, influence of aphids on 

 fruits, tests with lime-sulphur and nicotin solution, auxiliary experiments 

 during 1916, the delayed dormant application in the spraying schedule, and a 



