Geometridse 



destructive work was given by the late Professor C. V. Riley in 

 "Insect Life," Vol. IV, p. 108 et seq. From this article the cuts 

 which are herewith given have 

 been extracted. Botanists can- 

 not too carefully 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 larvae; 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 

 fumes of bisulphide of carbon 

 in an air-tight box or receptacle. 

 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 flame. 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 XLIII, Fig. 7, $ . 



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, $ . 



Syn. consecntaria Walker; sobria Walker; suppressaria Walker. 



335 



Fig. 200. Eois ptelearia. a, larva; 

 b, cocoon ; c, moth ; d, egg. All figures 

 greatly enlarged. (After C. V. Riley, 

 " Insect Life," Vol. IV, p. no.) 



