y FARMERS’ BULLETIN ‘01. 
north of southern New York and the central portions of Pennsyl- 
vania and Ohio. South of these points it is in certain years very 
troublesome and the subject of much complaint. Such a year was 
=> 1907, when the bagworm attracted greater atten- 
tion than any other tree defoliator. Numerous 
complaints were received of injuries in the region 
mentioned, especially from the States of New Jer- 
sey, Pennsylvania, Maryland, Virginia, West Vir- 
ginia, Ohio, Indiana, and Illnois. The natural 
enemies of this insect (see p. 7) were compara- 
tively scarce, and there is a strong possibility of a 
recurrence of injuries in the years to come. 
The general appearance of the bagworm is shown 
in figure 1, which illustrates the caterpillar when 
nearly full grown in its characteristic bag. When 
removed from its bag it looks as shown in figure 
Fic. 1.—Bagworm 2, a, which represents the full-grown larva. At 
(Thyridoptery® this period in its development it may attain a 
ephemeraeformis). J 
Natural size. length of about three-fourths of aninch. The body 
ee eee is soft in texture and dull brownish or blackish, 
while the head and thoracic segments are horny and whitish, mottled 
with dark brown. 
Fic. 2.—Bagworm (Thyridopteryx ephemeraeformis) : a, Full-grown larva ; 
b, head of same; c, male pupa; d, female pupa; e, adult female; f, adult 
male. All somewhat enlarged. (From Howard.) N. B.—The various 
stages are in reality a trifle longer than they are shown by the hair lines. 
ORIGINAL HOME AND PRESENT DISTRIBUTION. 
The bagworm is unquestionably native to North America. It 
abounds in the Southern States, except in the immediate Gulf region, 
