416 EXPERIMENT STATION RECORD. 



although other insects showed a tendency to become dangerous in the 

 near future. 



On the natural conditions which affect the distribution and abundance 

 of Coccidcc. T. D. A. Cocl-erell (pp. 91-95). — A general paper, treating of 

 the adoption of different food plants, individual variations within 

 species, and other factors. 



Hoiv shall ice improve our collectionsf C. P. Gillette (pp. 95-97). — An 

 interchange of specimens between economic entomologists is suggested, 

 and the greater use of sweep nets for rapid collecting is recommended. 



Carbon bisulphid for crayfish, H. U. WeefZ (pp. 98, 99). — Pouring an 

 ounce of the chemical into a crayfish hole and at once closing the open- 

 ing almost invariably killed the crustacean. 



Analyses of three common insecticides, F. W. Morse {New 

 Hampshire iSta. Bui. 36, pp. 37— W). — Analyses are reported of 5 differ- 

 ent brands of Paris green, 1 of London purple, and 1 of white hellebore. 



The analyses of Paris green showed a variation in the percentage of 

 arsenic trioxid of from 55.35 to 56.69 per cent. These analyses showed 

 no adulteration, the amount of arsenic trioxid present being nearly 

 that required by theoretical composition. 



The analysis of the London purple showed 37.56 per cent of arsenic 

 trioxid, which is slightly less than the average amount as reported by 

 other stations. 



The analysis of white hellebore showed 33.13 per cent of ash, with 

 an abundance of iron and aluminum oxids and insoluble silicious mat- 

 ter, indicating considerable adulteration with clay. Four other samples 

 of hellebore were analyzed later, and one was found to be adulterated 

 to a considerable degree. Unless the roots from which this insecticide 

 is made are thoroughly washed before pulverizing, there will undoubt- 

 edly be a considerable amount of earthy matter in the powdered article. 



Construction of the comb of the hive bee, C. Phillips [Trans. JSfeto Zealand 

 Inst., 38 (1895), pp. 479-490). 



Foul brood, or bee pest (Jour. IBrilish] Bd.Agr., 3 {189G), No. 3, pp. 132-134).— 

 Notes are given on Bacillus alvei and suggestions for preventing its attacks 



The tsetse fly disease (Agl. Join: Cape Colony, 9 {1896), No. 14, pp. 358-360). 



Ne'w Mallophaga, II, V. L. Kellogg {Leland Stanford Jr. Universiti/ Puhlicaiions, 

 Con tr. from Hopkins Seaside Lahoratorij, 1896, No. 7, pp. 429-548, pis. 14). — The author 

 figures and describes 3.3 new species of Mallophaga parasitic on land birds. In 

 addition to these new species, 10 species described by European authors, but now 

 known as parasitic to American birds are given. In the present paper a detailed 

 account is given of the mouth parts of the genera of Mallophaga and comparisons 

 made with those of various groups more or less iutimately connected with them. 



Contributions toward a monograph of the Aleurodidae, W. M. Mask ell 

 (Trans. Netv Zealand Inst., 38 (1895), pp. 411-449, pis. 12). 



The army worm in Ohio, J. S. Hine (Proc. Columbus Hort. Soc, 11 (1896), No. 2-3, 

 pp. 59-61). — Notes on an outbreak of Leucania in northwestern Ohio in 1896. 



The bagworm (Meehan's Monthly, 6(1896), No. 12, p. 233, figs, f).— Notes aregivon 

 on Thijyidopteryx ephenurceformis. Hand picking and the use of arsenites are recom- 

 mended for its destruction. 



