THE STKIPED BEET CATEKPILLAR. 15 
The mature larvae (fig. 4, b) are about 1| inches in length and are 
dull green, with a more or less distinct pinkish stripe along each side. 
The larvae are voracious feeders. When infesting sugar beets they 
prefer the older leaves, and the infested foliage may be entirely con- 
sumed, with the exception of the petioles. The full-grown larvae 
burrow into the soil to the depth of about an inch and form pupa- 
tion cells in the earth % wriggling about. 
The pupae (fig. 4, c) are " chunky," reddish brown, and about nine- 
sixteenths of an inch in length. 
LIFE HISTORY. 
There are three generations of this insect in the Arkansas Valley 
each year. The first moths are to be found during the latter half 
of May. These deposit eggs, from which a generation develops 
during the first part of July. Eggs deposited by the July genera- 
tion produce moths during the latter part of August and in early 
September. The larvae of the third generation mature late in the 
fall, and the pupae which develop live through the winter in cells 
in the soil. Adults develop from these pupae during the latter half 
of May of the following year. 
REARING RECORDS. 
During 1911 and 1912 the following rearing records were obtained 
in the laboratory at Rocky Ford, Colo. 
On June 1, 1911, a few eggs were collected in the field from sugar 
beets. They were deposited singly on the underside of the leaves. 
The record is as follows : 
June 1 Eggs collected. 
June 5 Eggs hatched. 
June 19 Larva? reached maturity. 
June 21 First pupae formed. 
July 2 First adults issued. 
From the foregoing records the stages are as follows : 
Days. 
Egg stage 4 
Larval stage 16 
Pupal stage 11 
Total 31 
On June 7, 1911, two apparently mature larvae were collected in the 
field from sugar beets. They burrowed into the soil and formed 
their pupation cells June 9 and pupated June 11. The adults issued 
June 29. In this case the pupal period was 18 days. 
September 17, 1911, a female moth captured at Rocky Ford was 
placed in a cage containing sugar-beet foliage, alfalfa blossoms, and 
