ENTOMOLOGY. 783 



by swarms in their flight was in many instances unsatisfactory. In some cases the 

 grasshoppers appeared to be killed off in large numbers by the fungus. 



The guinea-grass moth ( West Indian Bid., S {1902), No. 3, pp. 238-240). — Remigia 

 rep(nid<( is said to liave caused severe injury to Panicum maximum. Notes are given 

 on the a)ii>earance of the insect in its different stages and on its life history. 



The " green page" moth (Cydimon leilus) ( Wed Indian Bid., 3 {1902), No. 3, 

 pp. 2S0-23S). — Descriptive biological and economic notes are presented on this insect, 

 which appeared in immense nundx>rs in Trinidad during the autumn of 1901. 



Notes and practical suggestions concerning r(»cognition and methods of 

 combating animals which are injurious to cultivated crops and fruits in the 

 field and in storehouses, (t. dki, Guercio [Niiore Relaz. R. Staz. Ent. Agr., 1. ser., 

 1902, No. 4, PP- 497, Jigs. 284)- — This publication is in the nature of a handbook of 

 injurious insects, worms, criistaceans, etc. The following subjects are discussed: 

 The value and practical importance of economic entomology; the various insecticides 

 which are used and methods of preparing them; machines and apparatus used in 

 combating insects and other noxious animals; worms injurious to cultivated plants, 

 and mollusks which have been found to be of economic importance in agriculture. 

 The main part of the pul)lication is occupied with a detailed biological and economic 

 account of the various species of mites and insects which injiu'e cidtivated plants in 

 Italy. 



Experiments concerning the effect of insecticides and fungicides upon 

 plants treated with these substances, J. Moritz {ArJi. K. (h'siuidheitsamte, Biol. 

 Ahl., 3 (1902), N^o. 2, pp. 103-129). — In the experiments reported in this article the 

 author tested the effect of bisulphid of carbon and copper sulphate on plants. The 

 experiments with bisulphid of carbon were made in a zinc-lined box of 1,201.5 cc. 

 contents. The plants which were fumigated in this box included a number of flow- 

 ers and weeds, and also certain trees, including apple, pear, cherry, plum, and coni- 

 fers. tSome of the plants were in ])ots and others were removed from the pots and 

 freed from soil as far as possible. The results of these experiments are presented in 

 detailed tabular form. It was found that at temperatures varying from 12.9 to 24.8° C. 

 carbon l)isulphid exercised no injurious effect upon plants which were exposed to 

 it for a period varying from 30 minutes to 4 hours, at a strength represented by 14 to 

 71.8 gm. cai'bon bisulphid vaporized in a space containing 1,147 cc. On the other 

 hand, all the fruit trees were killed by exposure for 24 hours at a temperature of 

 9.3 to 19.9° C. to a strength of carbon bisulphid represented ])y 150.2 to 162.2 gm. 

 carbon l)isulphid vaporized in a space containing 1,147 cc. 



In experiments with copper sulphate a number of plants, including jjear, ])lum, 

 apple, and cherry, were dipped in solutions of this substance. The solutions con- 

 tained from 0.5 to 1 per cent copper sulphate, and the temperature of the solutions 

 was 14° C. TJie plants were immersed in the solution for from 2 to 3 hours. It w-as 

 found that the apple trees bore this treatment best and that the pears and plums 

 were most injured. The plants which were cut back before the treatment suffered 

 more than those which were not thus mutilated. 



A list of North American Lepidoptera and key to the literature of this 

 order of insects, 11. G. Dvar {Sniithm. Inst., U. S. Nat. Mus. Bid. 52, 1902, pp. 

 NIN -r 723 ). — In this bulletin the author presents a list of the known species of Lepi- 

 doi)tera of North America. The work is intended to replace Smith's List of Lepidop- 

 tera of Boreal North America, published in 1891. The classification adopted is based 

 largely on the author's views, and synonyms are given in all cases, together with 

 references to literature. The number of species listed is 6,622. An index of species, 

 genera, and families is appended to the bulletin. 



The origin of the natural coloration of the silk of Lepidoptera, D. Levrat 

 and A. Conte {Compt. Rend. Acad. Sci. Paris, 135 {1902), No. 17, pp. 700-702).— 

 The authors sprinkled neutral red, methylene blue, and picric acid on the food of 



