Weevils in Beans and Peas. 17 
The adults live on an average 5 or 6 days during the hottest 
weather, to as many as 30 to > 
40 days during the winter 
months of the Gulf Coast 
States. Activity is likely to 
cease entirely at a mean tem- 
perature of 50° F., or below, 
when the insects will seem 
dead to all outward appear- 
ances and only resume ac- 
‘tivity upon the appearance 
of warm weather. While the ric, 16—rour-spotted bean weevil: a, Bectle; 
‘immature stage may be passed _—®» ‘Jarva or grub; ¢, pupa. Enlarged. (Chit- 
: . fe - tenden.) 
in as few as 16 to 17 days, 21 
days is closer to the normal 
time required during hot 
summer weather. The 
longest period for larval 
development yet recorded 
‘is 88 days, from December 
to March, in Texas, when 
the temperature ranged 
from 22° to 86° F. There 
may be from 8 to 10 gen- 
erations a year in the 
Gulf Coast States. 
THE FOUR-SPOTTED 
BEAN WEEVIL.?? 
The four-spotted bean 
weevil somewhat. re- 
sembles and is a trifle 
larger than the cowpea 
weevil, but may be dis- 
tinguished from it not 
only by its more slender 
body but by the four 
black spots upon its wing 
Tig. 17.—Chick-peas affected by the four-spotted 
bean weevil. Compare these with the two sec- 2 
tioned chick-peas at the bottom of Figure 22. covers as shown in figure 
Enlarged. 16 
Tn 1885 this species was found to be swarming on black-eyed peas 
from Texas exhibited at the Atlanta Cotton Exposition. Since then 
2 Bruchus quadrimaculatus Fab. 
101921°—22 
a) 
o 
