756 EXPERIMENT STATION REOORD. [Vol. 35 



from British Columbia, by H. F. Wilson (pp. 82-85) ; Notes on the Early Stages 

 of Calocampa cineritia, by G. O. Day (pp. 86, 87) ; A Description of the Egg 

 and Ovipositor of Cuterebra fontinella, the Cotton-tail Bot. by S. Hadwen (pp. 

 88-91) ; Notes on the Habits of Some Lepidoptera, by J. W. Cockle (pp. 91-94) ; 

 Notes on the Early Stages of Epirrita dilutata, by G. O. Day (pp. 95, 96) ; 

 and The Oyster Shell Scale, by T. Wilson (pp. 96, 97). 



Som^e insect enemies of shade trees and ornamental shrubs, M. W. Black- 

 man and W. O. Eixis (N. Y. State Col. Forestry, Siiracuse Univ. iPuhs.'], 16 

 (1916), No. 26, pp. 123, pi. 1, figs. 60). — A summarized account of six of the 

 more important leaf-eating insects, eleven boring insects, and ten scale insects 

 (pp. 11-112) is followed by an account of spraying and spraying apparatus. 

 Insects in their relation to the chestnut bark disease, P. C. Craighead 

 (Science, n. ser., 43 (1916), No. 1100, pp. 133-135). — This is a critical review of 

 the bulletin by Studhalter and Ruggles, previously noted (E. S. R., 34, p. 853). 

 It is pointed out that the beetle Leptostylus macula, which the above-mentioned 

 authors state is the insect of most importance in the local dissemination of the 

 disease, under normal conditions never frequents healthy trees, and that to 

 disseminate this disease it would be necessary for the beetle to migrate from 

 infested to healthy trees. 



Controlling the coulee cricket, A. L. Melandeb (Washington Sta. Popular 

 Bui. 101 (1916), pp. 3). — The means of combating this pest are briefly described. 

 It is said to be easily possible to locate the restricted breeding areas and to 

 destroy the young crickets. 



A new species of Thripoctenus, L. T. Whxiams (Psyche. 23 (1916), No. 2, 

 pp. 54-61, fig. 1). — Under the name Thripoctenus nuhilipennis the author de- 

 scribes as new a form found to parasitize the larvae of either one or both of 

 two species of thrips, MegalotJirips spinosus and Cryptothrips rectangularis, at 

 Forest Hills, Mass. 



The false cabbage aphis (Aphis pseudobrassicae), J. J. Davts and A. F. 

 Satteethwait (Indiana Sta. Bui. 185 (1916), pp. 915-939, figs. 7; pop. ed., 

 pp. 4). — This plant louse, an account of which by Paddock of the Texas Sta- 

 tion has been previously noted (E. S. R., 34, p. 452), is said to be distributed 

 from Manitoba to Texas and from Massachusetts to California, apparently 

 occurring in potential numbers wherever wild mustard grows, and to be de- 

 structively abundant where turnips or radishes are planted. It may also 

 become a serious enemy of greenhouse crops. 



The present bulletin is based upon life-history studies commenced in October, 

 1913, and carried on during 1914 at La Fayette, Ind., in cooperation with the 

 Bureau of Entomology of the U. S. Department of Agriculture. 



Technical descriptions are given of the five instars of the viviparous genera- 

 tion and of the winged viviparous female. Studies of its life history and habits 

 reported in detail include tables which show the consecutive generations ob- 

 served at La Fayette, Ind., from 1913 to 1915, and a figure showing the duration 

 of generations. A comparison shows this plant louse to be more prolific than 

 any other recorded species, thus indicating its great importance as an enemy of 

 cruciferous plants. 



Its natural enemies apparently do not appear in effective numbers until late 

 In the fall after the plant lice have damaged the crop. Diaeretus rapce and 

 Pachyneuron micans have been reared from it by the authors, and Aphidoletes 

 sp. and a syrphid larva have been observed to be predacious on it. Empusa 

 aphidis Is also an important check in late fall. 



Control measures consist in the use of a 40 per cent solution of nicotin at the 

 rate of 1 : 1,200, with 4 lbs. of soap to each 50 gal. of water. In greenhouses 



