Vol. 1] Clausen. — Life-Histories of California CoccinclUdac. 261 



Life-History — Coccinella trifasciata Linn. 

 Berkeley, 1914 



1 4/20 4/26 6 5/1 5 5/4 



2 4/20 4/26 6 5/1 5 5/4 3 5/7 3 5/14 7 5/14 5 29 



3 4/20 4/26 6 5/1 5 5/5 4 5/8 3 5/16 8 5/21 5 31 



4 4/20 4/26 6 5/1 5 5/5 4 5/8 3 5/15 7 5/21 6 31 



5/19 5 29 



Average 6 5.25 4.2 3.25 7.4 5.7 31.8 



The adult records are given for ten individuals for a fifteen- 

 day period ; the number of aphids eaten per day ranged from 6 

 to 44 per day. The period totals varied from 383 to 470, with an 

 average of 435. The feeding, with the exception of an occasional 

 day, was very uniform, due no doubt to the evenness of the tem- 

 perature conditions during the time covered by the experiment. 



Medium-sized rose aphids (Macrosiphum rosae) were used 

 for feeding purposes. 



11 17 16 8 13 17 21 13* 16* 12* 24* 



