Vol. 1] Clausen. — Life-Histories of California Coccinellidae. 277 



Life-History — OUa abdominalis Say 

 Sacramento, 1913 





;2; QJ2 W Jlo -H Jm c) Jm CO Jm ti<-^ J'S W 



"S Ho 



1 6/18 6/22 4 6/25 3 6/27 2 6/30 3 7/6 4 7/10 4 20 



2 6/18 6/22 4 6/26 4 6/28 2 7/1 3 7/6 5 7/9 3 21 



3 6/18 6/22 4 6/25 3 • 6/29 4 7/1 3 7/6 5 7/9 3 22 



4 6/18 6/22 4 6/26 4 6/29 3 7/1 3 7/5 4 7/8 3 21 



5 6/18 6/22 4 6/26 4 6/29 3 7/1 3 7/6 5 7/10 4 23 



6 6/18 6/22 4 6/26 4 6/28 2 6/30 2 7/6 6 7/9 3 21 



7 6/25 6/30 5 7/3 3 7/5 2 7/8 3 7/12 4 7/16 4 21 



8 6/25 6/30 5 7/3 3 7/5 2 7/8 3 7/12 4 7/16 4 21 



9 6/25 6/30 5 7/3 3 7/5 2 7/8 3 7/12 4 7/16 4 21 



10 6/25 6/30 5 7/3 3 7/5 2 7/7 2 7/12 5 7/16 4 21 



11 6/24 6/28 4 7/1 3 7/3 2 7/6 3 7/11 5 7/14 3 20 



12 6/24 6/28 4 7/1 3 7/3 2 7/6 3 7/11 5 7/14 3 20 



Average 4.3 3.3 2.3 2.8 4.7 3.5 21. 



Feeding Records. — For the larval records three distinct series 

 of experiments comprising thirty individuals were carried on, 

 and of these fourteen finally reached maturity. The range in 

 total number of aphids eaten extended from 196 to 266, with an 

 average of 240, which, when reduced to a daily basis, represents 

 19.8 aphids per day for the larval period of approximately 17 

 days. A marked increase in the feeding was observed immedi- 

 ately after the second moult. 



Larval Feeding Eecords — OUa abdominalis Say 

 Sacramento, 1913 



H H II H 



