December, ’24] larson and fisher: weevils in dry beans 
635 
In addition to the mean daily temperature, Fig. 18 records the num¬ 
ber of weevils emerging during five day periods from August 9, 1923, to 
March 14, 1924, the dates of the first and last catch respectively. These 
H H M ro 
(O ^ O M CD W 
III III II 
H H M M SIHH- 
w cd w cd ro 
H w to 
CD 03 CD W CD 
io to 1 1 
-- - JO - 
H tO N W 
August 
September 
JO JO 
Cl O Ol H CD H 
I I I I 18 
H M M I-J M 
O ^ cO a O tP* 
October 
February 
march 
Fig. 18.—Record (broken line) of the number of Bruchids captured dur¬ 
ing five-day periods between August 9, 1923, and March 14, 1924. 
Daily mean temperatures for periods shown by solid line. 
periods do not necessarily correspond with the dates during which the 
peak flights occurred as the peak flights could have been on the last two 
days of one period and on the first three of the next or vice versa. The 
chart shows distinctly the flight periods of the first, second and third 
broods. It was thought that after the majority of the third brood 
emerged there would be such an overlapping of generations that it 
would be impossible to determine when the third ended and the fourth 
began or when any later brood began. As a matter of fact, after the 
third brood had emerged there was left in the seeds so little food that the 
lack of food alone would have greatly retarded successive weevil de- 
