Geometridee 
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, S. 
Syn. consecutaria Walker; sobria Walker; suppressaria Walker. 
335 
Fig. 200. —Eois ptelearia. a , larva; 
b, cocoon; c t moth; d, egg. All figures 
greatly enlarged. (After C. V. Riley, 
“ Insect Life,” Vol. IV, p. no.) 
