12 BULLETIN 892, U. S. DEPARTMENT OF AGRICULTURE. 
of sugar beet and lamb’s-quarters, but no eggs for a third generation 
were deposited. All went into hibernation before the middle of Sep- 
tember. 
The dates of emergence and other dates given in the foregoing 
records tally almost to a day with those made in independent field 
records during another season. 
Every year a few beetles of a partial third generation are pro- 
duced. This is shown by the following records: 
On May 17 several large larvee were collected in the field from 
lamb’s-quarters and placed in a rearing cage. 
First generation. 
May ih (ie sn oe ek ee Te rae eee Larve collected. 
May: 1922 toes oe See eee ee Larve reached maturity. 
IME Ay Depa SS a ERS es 2s le ewe First pups formed. 
May: 302 222 en es ee ne eee First adults developed. 
As the larvee were collected in the field, the foregoing record is 
not complete. The pupal period, however, was 7 days. <A pair of 
these beetles mated June 14 and were placed in a separate cage. The 
record is as follows: 
Second Generation. 
Maye oO sea ap tana Moa pa ea Beetles developed. 
cfu 0 sia [es En Nees Ree ee __ Beetles mated. 
hye hoe > = ____First eggs deposited. 
uikyor! OH et ese eae meee First larvee hatched. 
Sul yen 92s Sse ee eS ___-First larve reached maturity. 
AU SIS Ge ae Erie ee First pupze formed. 
SANT SUES by aU es a 6 is ee ee First adults developed. 
From the foregoing record the periods are as follows: 
Days 
Ineubation Period! Sas Aes ee ee a ee ee es eee ee 9 
Larval period 22.22 22 ee ee ee ee eee eee eee 14 
Pupal period: 2! == See ee ee eee See eee 9 
Total- period tromcecscto.adult=== = ee eee 32 
The beetles, 15 in number, which developed August 3 were confined 
in one cage. August 21 a single cluster of 17 eggs was deposited 
but none thereafter, and all the beetles went into hibernation during 
early September. The record for these 17 eggs is as follows: 
Third generation. 
Aung st (12 oe ree eee Beetles developed. 
ANUS USE Di = ee First eggs deposited. 
August 272) 2S Ss eee pee ee Larve hatched. 
September 10/202) aS se ee Larve reached maturity. 
September 202 2223)" Raeesset eae First pupze formed. 
QOetober 120225) 4 ae ee eee The adults developed. 
rs 
