8 BULLETIN 843, U. S. DEPARTMENT OF AGRICULTURE. 



string beans. A pair of beetles which developed in late August, 

 1914, mated August 29 and were isolated. These beetles commenced 

 hibernation October 12. and on November 10 the rearing cage, con- 

 taining earth and some dead bean leaves under which the beetles 

 rested, was placed in the laboratory cellar. The cage remained in 

 the laboratory cellar until May 20, 1915, when it was again placed 

 in the open air. The beetles emerged from hibernation on June 15, 

 and began feeding. The first eggs were deposited June 18, and 

 from this stock the species was reared for two seasons (1915 and 

 1916) without a break. The record for 1915 is given in Table I 

 and that for 1916 in Table II. 



Table I. — Generations of Epilachna corruptee in 1915. 



Life-history event. 



First 



generation 



issued. 



Second 

 generation 

 appeared. 



Adults developed 



First eggs deposited- . . 



First eggs hatched 



First larvae matured . . 

 First larvae pupated... 

 First adults developed 



Egg period 



Larval period 



Pupal period 



Total duration . . 



Aug., 1914 

 June 18,1915 

 June 25,1915 

 Julv 12,1915 

 July 13.1915 

 Julv 19.1915 



July 19,1915 

 Julv 30,1915 

 Aug. 5, 1915 

 Aug. 23,1915 

 Aug. 24,1915 

 Sept. 1,1915 



Days. 



Days. 



Table II. — Record of the generations of Epilachna eorrupta in 1916. 



Life-historv event. 



First 



generation 



issued. 



Second 

 generation 

 appeared. 



Adults developed 



First eggs deposited. . . 



First eggs hatched 



First larvae matured . . 

 First larvae pupated. . . 

 First adults developed 



Egg period 



Larval period 



Pupal period 



Total duration . . 



Sept. 1,1915 

 June 18,1916 

 June 25,1916 

 Julv 10,1916 

 Julv 11,1916 

 Julv 17,1916 



Julv 17,1916 

 July 30,1916 

 Aug. 5, 1916 

 Aug. 21,1916 

 Aug. 23,1916 

 Aug. 31,1916 



Days. 



Days. 



32 



The 19 beetles which developed September 1 fed until September 

 23, when hibernation began. The cage was placed in the laboratory 

 cellar November 10, 1915, and was removed to the open May 3, 1916. 

 June 12, 16 beetles issued from hibernation, 3 having died during 

 the winter, and began feeding. One pair mated June 13, and the 

 record of the progeny is given in Table II. 



The female died September 9. The male went into hibernation 

 October 5, and was later destroyed. In this case the egg-laying 



