JUN 27 1916 



UNIVERSITY OF CALIFORNIA PUBLICATIONS 



TECHNICAL BULLETINS 



COLLEGE OF AGRICULTURE, AGRICULTURAL EXPERIMENT STATION 



ENTOMOLOGY 



Vol. 1, No. 6, pp. 251-299 June 17, 1916 



LIFE-HISTORY AND FEEDING RECORDS OF 



A SERIES OF CALIFORNIA 



COCCINELLIDAE* 



BY 



CUETIS P. CLAUSEN 



The studies herein outlined of a series of California Coeeinel- 

 lidae were undertaken by the writer at Sacramento, California, 

 during the spring and summer of 1913, and concluded at Berke- 

 ley and Riverside during the season of 1914. Due to the change 

 of locality, a certain unavoidable lack of continuity was made- 

 necessary, and the variable contributing factors of temperature, 

 humidity, aphis supply, etc., were thus more strongly accentu- 

 ated than would have been the case had the experiment with the 

 different species been conducted simultaneously under definite 

 and regular conditions. A further discussion of this matter will 

 be presented in connection with the particular cases as they 

 arise. 



The coccinellid species used for the tests are all of fairly 

 general distribution over the state, and in general may be said to 

 be the eight most important aphis-eating species in California. 

 They are : Hippodamia convergens Guer., Hippodamia amhigua 

 Lee, Coccinella calif ornica Man., Coccinella trifasciata Linn., 



* Paper No. 14, Citrus Experiment Station, College of Agriculture, 

 University of California, Eiverside, California. 



The investigation of this problem was begun and largely completed by 

 the writer while field a.ssistant in the Bureau of Entomology under the 

 immediate direction of Mr. W. B. Parker, and concluded while in the 

 service of the University of California. Permission for publication has 

 been granted by Dr. L. O. Howard, Chief of the Bureau of Entomology, 

 United States Department of Agriculture. 



