80 SOME INSECTS INJURIOUS TO TRUCK CROPS. 
The record for the pair which mated April 30 is as follows: 
Record of egg deposition of a single female of Diabrotica balteata, 
which mated April SO, 1909 a 
1909. 
Number 
of eggs. 
May 8 
May 19 
May 21 
May 24 
May 26 
Total 
39 
6 
23 
14 
16 
98 
a May 31, male died; June 2, female died. 
This gives a total of 98 eggs from one female. The life of the 
male was 43 days and that of the female 45 days. 
The record for the 39 eggs deposited May 8 is as follows: 
Detailed record for the 39 eggs of Diabrotica balteata deposited May 8, 1909. 
May 8 39 eggs deposited. 
May 13 39 eggs hatched. 
May 23 First larvae made cells. 
May 27 First larvae pupated. 
June 1 First adults developed. 
June 2 First adults issued from cells. 
June 4 All adults had issued. 
The stages were: 
Days. 
Egg stage ■. 5 
Larval stage 14 
Pupal stage 5 
Total 24 
The larvaa of this species were confined in large jelly glasses and 
in large vials and fed with sections of sorghum cane. Of the three 
species reared (Diabrotica balteata, D. vittata, and D. 12 -punctata), 
Diabrotica balteata was by far the most hardy, and this probably 
accounts for its abundance as compared with D. vittata and D. 
12-puncta,ta. 
Records showed that one lot matured March 1, a second April 18, 
and a third June 1. Mr. McMillan found the beetles in greatest 
abundance during November and December. Judging from this and 
from the rearing records, there may be at least six generations, and 
probably one or two more each year. 
Occasional mutilated beetles were found lying on cucurbit and 
other leaves and had evidently been killed by some predaceous 
insects. Many specimens dissected during May showed no internal 
parasites. 
The temperatures at Brownsville during January, February, and 
March ranged from a minimum of 29° F. to a maximum of 95.1° F. 
