2 
presence of young growing wheat, oats, barley, or rye; and, second, 
weather conditions favoring its rapid increase and unfavorable for 
the development of its natural enemies. It will breed freely in the 
fields from an altitude of less than 20 feet above sea level on the At- 
Fic. 2.—The spring grain-aphis or “green bug” (Towoptera graminum): a, Wingless 
female; b, larva; c, pupa. Much enlarged. (From Pergande.) 
lantic coast to an elevation of nearly 8,000 feet in New Mexico, and 
from eastern Washington, southern Montana, northwestern Minne- 
sota, southern Wisconsin, northern Ohio, and southern Pennsylvania 
southward to extreme southern South Carolina, southern Texas, and 
” 
Fic, 5.—The spring grain-aphis or “ green bug” (Towvoptera graminum) : a, Winged mi- 
grant; b, antenna of same. a, Much enlarged; b, highly magnified. (From Pergande.) 
New Mexico. Yet, with normal weather conditions during the first 
four or five months of the year, these facts signify absolutely nothing, 
for this insect will not be abundant enough to attract any attention 
by its injuries. 
(Cir, 93] 
