36 MISCELLANEOUS COTTON INSECTS. 
by Doctor Chittenden, would seem to indicate that the moth hibernates 
over winter. Professor Gillette states that the eggs require four or 
five days to hatch, and that the hrst eggs are laid about five and the 
last about sixteen da} T s after emergence. No record of the length of 
the larval stage has been given. In Texas the eggs hatched in three 
days as against tive, and the pupal stage was six to eight days as 
against ten to fourteen — approximately — in Colorado. The length of 
the larval stage in Texas Avas twenty -three days. Thus the complete 
life cycle from the time of oviposition until the moth lays most of her 
eggs would require in that section about forty days.' 
Comparing the above data with the life history of the garden web- 
worm, as given on pages 12-13, many points of resemblance will be seen. 
From this analogy the hibernating moths of the beet army worm 
probabl} T oviposit early in 
April, the moths maturing 
from them — those of the first 
generation — being abundant 
about the middle of May. 
The second generation of 
moths emerges during the 
first or second week in July, 
and the third a little over a 
month later — early in August. 
A fourth generation of moths 
undoubtedly matures by the 
third week of September, as 
larva? have been taken in 
southern California October 
24 and November 5, in about 
the san.e latitude as southern 
Texas. The hibernating moths would thus probably form the fifth 
generation. Previous writers are doubtless correct in stating that in 
Colorado there are but three generations. 
Owing to the destructive habits which this insect has shown in the 
Colorado beet fields, its course in the cotton fields as it moves east- 
ward will warrant attention. 
Parasites. — The July brood of larvae which matured early in August 
were badly parasitized by Pristomerus texanus Ashm., Chelonus tex- 
anus Cress., and Apanteles algonquinus Ashm. 
PLATYNOTA LABIOSANA Zell. 
Small green larvae of this species were found rolling up cotton 
leaves at Terrell July 2, 1904. They pupated July 11, and moths 
emerged July 20. Mally has mentioned Platynota rostrana Walk, as 
sometimes working on cotton/' 
Fig. 19.—Caradrina exigua: a, moth; b, larva, lateral 
view; c, larva, dorsal view: d, head of larva: e, egg, 
viewed from, above; /, egg, from side— all enlarged 
(e, /, after Hofmann; a-d, after Chittenden). 
«1893: Bui. 29, o. s., Div. Ent., U. S. Dept. Agric, p. 30. 
