256 University of California Publications. [Entomology 



Life-History. — The records of thirteen individuals give the 

 average hatching period during normal summer conditions as 5.4 

 days, the second period from two to five days, the third period 

 from three to four days, the fourth period from five to eight 

 days, and the pupal period from four to six days. The averages 

 for these periods were 5.7, 3.3, 3.4, 6.8, and 4.5 days, respectively, 

 which, in connection with the egg stage of 5.4 days, gave an 

 average life-cycle of 29.1 days. A rather peculiar variation is 

 noted in Nos. 1 and 2, in which case the first larval period was 

 lengthened to eight to ten days, respectively, which is an increase 

 of three to five days over the normal of five days as represented 

 by the ten other individuals. No noticeable variations appeared 

 in the later stages and the life-history of the first individual was 

 complete in 31 days, or slightly less than two days over the 

 normal. No appreciable difference in size was noted. Individual 

 No. 2, referred to above, died shortly after pupation. In the case 

 of nearly all individuals, a period of from one to three days 

 elapsed from the time feeding ceased until the last larval skin 

 was cast. This is the only species in which this period of in- 

 activity was so uniform and pronounced. 



Life-History — Coccinella caJifornica Mann. 

 Sacramento, 1913 



O rt ■- o 



Average 5.4 5.7 3.3 3.4 6.8 4.5 29.1 



