. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. Geometridx destructive work was given by the late Professor C. V. Riley in "Insect Life," Vol. IV, p. io8 et scq. From this article the cuts which are herewith given have been extracted. Botanists can- not too carefullv guard against this and other insect plagues which multiply in their collec- tions. A solution of corrosive sublimate and arsenic, such as is commonly employed for poisoning herbarium speci- mens, will do much to prevent the ravages of the larvic; but
. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. Geometridx destructive work was given by the late Professor C. V. Riley in "Insect Life," Vol. IV, p. io8 et scq. From this article the cuts which are herewith given have been extracted. Botanists can- not too carefullv guard against this and other insect plagues which multiply in their collec- tions. A solution of corrosive sublimate and arsenic, such as is commonly employed for poisoning herbarium speci- mens, will do much to prevent the ravages of the larvic; but, as is pointed out by Professor Riley in the article to which reference has been made, addi- tional safety from attack will be secured if all specimens, as they are received in the herbarium, are subjected to at least twenty- four hours' exposure to the Fig. 200—Eois/>(e/enHa. «, larva; fumes of bisulphide of carbon ^ cocoon: <-, moth; </, egg. All figures • i- 1 ^ 1 .1 greatly enlarged. (After C. V. Riley, in an air-tight box or receptacle, h i^J^^ Lif^H, voi. iv, ,,. no.) This substance, as experience has shown, is destructive to all forms of insect life. Care should, however, be exercised in its use, as the fumes mixed with atmo- spheric gases make a highly explosive compound. The opera- tion should never be undertaken in the presence of flami-. It is not even safe to allow the fumes of carbon bisulphide to mingle in large quantity with the atmosphere of an apartment which is lighted by electricity. Accidental sparking, owing to some de- fect of the wires, may cause an explosion. Several bad accidents have occurred from the use in careless hands of this otherwise most valuable insecticide. (2) Eois ossularia Hubner, Plate XLlll. Fig. 7, S. The moth, which has an extensive synonymy, which we will omit, is widely distributed throughout the United States. (3) Eois inductata Guenee, Plate XLIII, Fig. 6, i. Syn. consectttaria Walker ; sobria Walker ; suppressaria W
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