260 University of California Puhlications. [Entomology 



Egg-Laying Eecords — CoccineUa trifasciata L,inn.— {Continued) 

 Berkeley, 1914 



Date 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



June 1 



2 



3 



4 



5 



Total 349 251 109 303 209 284 353 114 353 158 



Average 8.9 8.6 4.5 7.7 7.4 8.1 10.0 8.1 8.4 8.3 



Life -History. — The entire series of individuals used in this 

 test was secured from a cluster of eggs deposited by one female 

 on April 20. These hatched six days later and the adult beetles 

 emerged in from 23 to 29 days. The first larval period, with 

 three exceptions, required five days, the second three to five days, 

 the third from three to four days, the fourth six to eight days, 

 and the pupal period from five to seven days. The average for 

 twelve individuals for the entire cycle from egg to adult was 31.8 

 days. 



Feeding Habits. — With complete feeding records of twelve 

 larvae as a basis of comparison, it was found that the total num- 

 ber of aphids eaten varied from 217 to 375, and averaged 294. 

 This, when reduced to a daily basis, represented 15.8 aphids per 

 day during the stage of approximately 26 days. 



