286 University of California PuUications. [Entomology 



Life-Histonj. — On the basis of seven individuals, the entire 

 period from egg to adult was found to be 26.7 days, with a range 

 of from 25 to 29 days. The different stages required approxi- 

 mately the following periods of time: egg stage, 5 days; first 

 larval, 4.6 days; second larval, 2.9 days; third larval, 3.0 days; 

 fourth larval, 5.6 days, and the pupal stage, 6.0 days. It will 

 be observed that, while the total period required by the four 

 specimens reared in May and three in August is practically 

 identical, the early brood required approximately 5.75 days for 

 the first larval stage and 2.25 days for the second, as compared 

 with 3.0 and 3.7 days, respectively, for the later brood. All indi- 

 viduals w^ere full-sized at time of emergence. 



Life-History — Adalia bipunctata Linn. 

 Sacramento, 1913 



m 73 Mioj g 4030- a MOi a hiij) aa wia- j Mp-^^ 



-2-) & at* c M a H bc i= cM „ a c wi S c tf 5 w 



S-2 bti Era -5; clS rs o«x) ct«r3p. <!;5 « '"Sr°'" 

 25 Q=3 H j-g _; ^-5 01 J1c CO h-Jm Tl<^ iJto f£I h-JoiHo 



1 5/20 5/25 5 6/1 7 6/3 2 6/6 3 6/11 5 6/17 6 28 



2 5/20 5/25 5 5/30 5 6/1 2 6/5 4 6/11 6 6/18 7 29 



3 5/20 5/25 5 5/30 5 6/2 3 6/4 2 6/8 4 6/14 6 25 



4 5/20 5/25 5 5/31 6 6/2. 2 6/5 3 6/10 5 6/16 6 27 



5 8/25 8/31 5 9/2 3 9/6 4 9/8 2 9/14 6 9/20 6 26 



6 8/25 8/31 5 9/2 3 9/5 3 9/8 3 9/10 6 9/19 5 25 



7 8/25 8/31 5 9/2 3 9/6 4 9/8 2 9/15 7 9/21 6 27 



Average 5,0 4.6 2.9 3.0 5.6 6.0 26.7 



Feeding Records. — The results from ten individuals through- 

 out the entire larval period of approxinuitely 22 days gave the 

 maximum number of aphids eaten during the period as 308, the 

 minimum 220, and the average 252. This gives. an average of 

 14.1 aphids per day for the entire period. It will be observed in 

 the table that a very sudden increase in the feeding took place 

 about eight days after hatching, and this was found to corre- 

 spond very closely to the time of the second moult, the number 

 of aphids eaten was approximately doubled at this time. 



