Vol. 1] Clausen. — Life-Histories of Calif ornia Coccinellielae. 207 



larval period is given to facilitate a comparison of the daily 

 records. The period averages ranged from 475 aphids for 

 Coccinella californica to 216 as a minimum for Cycloneda san- 

 gwinea. The maximum individual record was 580 and the mini- 

 mum 147 for the two above-named species, respectively. Feed- 

 ing in the case of Olla oculata was very regular, the difference 

 between the limits of the ten individuals being only 50 aphids 

 for the period, while a difference of 280 was noted in the case 

 of Cycloneda sanguinea. In regard to Coccinella cedifornica, it 

 must be remembered that for a period of one to three days 

 previous to pupation no aphids were eaten, a condition which 

 considerably reduced the daily average as compared with other 

 species which fed normally up to the day of pupation. In spite 

 of this, C. californica heads the list with 24.9 aphids per day for 

 the entire period ; H. convergens is second with 20.7 ; and //. 

 ambigua last with 11.4 per day. 



Larval Feeding Eecords 



Number 

 specimens 



C. californica lo 



C. trifasciata 12 



H. convergens 12 



H. ambigua 8 



O. abdominalis 14 



O. oculata 10 



A. bipuuctata 10 



C. sanguinea 10 



Adult Feeding Records. — The feeding records for the adults 

 of the various species as given in the following table are for a 

 period of fifteen days with the exception of Hippodeimia con- 

 vergens, an eight-day record of which was taken from the coni- 

 plete adult feeding data of individuals from storage, as previ- 

 ously explained in the discussion of that species. The number 

 of beetles of the different species ranged from seven for //. con- 

 vergens, and nine for Olla ahdominalis to ten in the case of the 

 other species. The maximum period average was 624 aphids for 

 Olla oculata. while the minimum was 234 to the credit of Ci/clo- 

 neda sanguinea. The individual maximum was 672 and the mini- 

 mum 205 aphids, respectively, for the same two species above 



