8 
BULLETIX 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 EpiJachna corrupta in 1915. 
Life-historv event. 
First 
generation 
issued. 
Second 
generation 
appeared. 
Adults developed 
First eggs deposited 
First eggs hatched , 
First larvae matured . . . 
First larva? pupated 
First adults developed. 
. Aug.. 1914 
J June IS. 1915 
. June 2-5.1915 
. Julv 12,1915 
. Julv 13.1915 
. Julv 19.1915 
Julv 19,1915 
Julv 30.1915 
Aug. 5. 1915 
Aug. 23.1915 
Aus. 24.1915 
Sept. 1.1915 
Egg period.... 
Larval period. 
Pupal period. . 
Total duration . 
Dau.i 
Days. 
So 
Table II. — Record of the generations of EpiJachna corrupta in 1016. 
Life-historv event. 
First 
generation 
issued. 
Second 
generation 
appeared. 
Adults developed Sept. 1, 1915 
First esgs deposited June 18, 191 ri 
First eszs hatched June 25. 1916 
First larvae matured Julv 10. 1916 
First larvae pupated Julv 11, 1916 
First adults developed July 17. 1916 
Days. 
Egg period r 7 
Larval period 16 
Pupal period 6 
Total duration 29 
Julv 17,1916 
Julv 30,1916 
Aug. 5. 1916 
Aug. 21.1916 
Aug. 23.1916 
Aug. 31.1916 
". 
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 
