THE BE AIT LADYBIRD. 21 
(20) Essig, E. O. 
1915. Injurious and beneficial insects of California. 
(21) Merrill, D. E. 
1917. The bean beetle. N. Mex. Agr. Exp. Sta. Bui. 106. 
(22) Orton, W. A., and Chittenden, F. H. 
1917. Control of diseases and insect enemies of the home vegetable 
garden. U. S. Dept. Agr. Farmers' Bui. 856. 
(23) Chittenden, F. H. 
1919. The bean ladybird and its control. U. S. Dept. Agr. Farmers' Bui. 
1074. 7 p., 3 fig. 
THE BEAN LADYBIRD IN COLORADO IN 1919. 
By A. E. Mallory, Scientific Assistant. 
LIFE-HISTORY RECORDS. 
Hibernating adults of the bean ladybird which had passed the 
winter successfully began to appear in Colorado in 1919 about the. 
middle of June, the first individuals having been found June 16 
feeding on beans. A week to 10 days later they began to deposit 
eggs on the underside of the leaves in clusters of about 40 or more. 
About 2 weeks later, July 9 and 10, the eggs hatched, and the tiny 
yellow larvae commenced to feed in a colony near the egg cluster. As 
they grew older they became separated and did not necessarily con- 
fine their feeding to the underside of the leaf. As the season ad- 
vanced, they fed on every part of the plant, blossoms and pods in- 
cluded. The larvae were present in all stages from the first ap- 
pearance until at least September 10. On July 22, which was 10 
or 12 days after the eggs had hatched, pupae were found. During 
the early part of the season, when foliage is plentiful, pupation takes 
place on the underside of the leaf. In case the foliage has been 
extensively destroyed pupation may take place on either side of the 
leaf or on both sides, 25 to 30 pupae on a single leaf being not un- 
common. As many as 100 on a single leaf were reported in a case 
where infestation was heavy. This congregating at the time of pupa- 
tion seems to be characteristic of the species. Pupae were observed on 
other plants near beans when the foliage of the beans was almost 
destroyed. 
On July 28 adults of the first brood were observed, and by July 30 
they were numerous, gradually increasing in number until about 
September 1 when they seemed to reach their maximum numbers. 
The first-brood adults are much lighter in color than the hibernating* 
individuals, being a bright yellow at the time of emergence. They 
gradually become darker, and at hibernating time some are dark red- 
dish brown, almost if not entirely as dark as the hibernating indi- 
viduals. Eggs deposited by this new brood were observed August 
28 and September 2. It is possible that eggs were deposited by this 
brood earlier than these dates. 
