Vol. 1] Clausen. — Lifc-Hisfoyies of California Cocci >icllidar. 299 



SUMMARY 



Some of the main points determined in the investigations as 

 herein outlined may be briefly stated as follows. 



1. The life-history of an aphid-feeding coeeinellid under 

 normal summer conditions in California, based upon the results 

 secured from eight species, may be given as twenty-seven days, 

 divided as follows : egg stage, five days ; first larval stage, five 

 days; second, three days; third, three days; fourth, six days, 

 and the pupal stage five days. 



2. The number of aphids eaten by the larvae of the different 

 species is in proportion to the size of the individuals. 



3. The above, to a limited extent, may be said to be true in 

 the ease of the adults also. 



4. Temperature and humidity are very strong contributing 

 factors in the development and behavior of the various species. 



5. The number of eggs to be expected under normal field 

 conditions will vary from 200 to TiOO, or occasionally more, and 

 extending over a period of from four to eight weeks where the 

 female has lived the full adult life under optimum conditions. 



6. The period intervening between emergence and mating is 

 one to three days, and from mating to oviposition, eight to 

 eleven days, thus giving a period of from ten to fifteen days after 

 emergence before oviposition may be expected. 



7. Oviposition normally takes place daily, with occasional 

 exceptions. 



8. Only one fertilization is necessary during the life of the 

 female, fertile eggs having been produced in one instance fifty- 

 five days after mating. 



Transmuted September 25, 1915. 



