298 



Vnivcrsitii of California Puhlications. [Entomology 



named. On a daily basis the variation extended from 56.1 aphids 

 for H. convergens to 15.6 for C. sanguinea. In general it may be 

 said that the number of aphids eaten varied practically in direct 

 proportion to the size of the individuals, though a conspicuous ex- 

 ception to this generalization may be noted in the case of Coc- 

 cinella calif ornica, with a record of only 34.0 aphids per day. 



Adult Feeding Eecords 



• Length of 



Number period, 



specimens days 



C. calif ornica 10 15 



C. trifasciata 10 15 



H. convergens 6 8 



H. ambigua 10 15 



O. abdominalis 9 15 



O. oculata 10 15 



A. bipunetata 10 15 



C. sanguinea 10 15 



Measurements. — In the following table is given the measure- 

 ments of the egg, full-grown larva, and adult of each species. In 

 every case the figure given represents the average of ten indi- 

 viduals, and particular care was taken to secure larvae of 

 normal development. The variation in length of eggs was com- 

 paratively slight, those of Adalia hipunctata and Cycloneda 

 sanguinea measuring 1.3 mm., of Coccinella californica 1.5 mm., 

 and of the remaining species 1.4 mm. The larvae ranged in 

 size from 6.0 mm. for Cycloneda sanguinea to 10.2 mm. in the 

 case of Coccinella californica. This ratio also held for the 

 adults, C. sanguinea measuring 4.5 mm. and C. californica 

 8.0 mm. 



Comparative Measurements 



Egg Larva Adult 



C. californica 1.5 mm. 10.2 mm. 8.0 mm. 



C. trifasciata 1.4 8.0 6.5 



H. convergens 1.4 8.2 7.0 



H. ambigua 1.4 8.1 7.0 



O. abdominalis 1.4 7.1 6.0 



O. oculata 1.4 7.0 6.5 



A. bipunetata 1.3 6.0 5.0 



C. sanguinea 1.3 6.3 4.5 



