and larger limbs where they congregate to molt. Later, they re- 
turn to the foliage to continue their feeding. Full-grown larvae 
drop to the ground and wander about searching for pupation 
sites. At this time they are often found in large numbers along 
the foundation walls of houses. Pupation occurs in the soil and 
eee) are one or two generations per year, depending on locality 
3828). 
The walnut caterpillar is frequently a serious pest of walnut. 
Trees heavily defoliated 2 or more years in succession are seri- 
ously injured or killed. Isolated trees or trees growing in small 
groups are especially subject to heavy attack. Losses have been 
particularly severe in the Central States. 
Datana major G. & R. feeds on azalea and apple and various 
shrubs from the East Coast to Illinois. Full-grown larvae have 
mahogany red heads, cervical shields, and legs. Their bodies are 
marked with longitudinal, yellow lines broken with black, giving 
them a finely spotted appearance. 
Hyperaeschra stragula (Grote) has been recorded from south- 
ern Canada and the Northern States, where it feeds on willow 
and aspen. Full-grown larvae are about 37 mm. long. The head is 
flattened in front and slightly bilobed. The body is mostly pearly 
gray with a reddish-brown dorsal line between the head and 
second tubercle. The second and third abdominal segments each 
bears a conical tubercle directed backward, and there is a promi- 
nent, pale rust hump on the eighth abdominal segment. Larvae 
are found from June to October and the winter is spent as a pupa 
in the ground. There are one and sometimes a second generation 
per year. 
Pheosia rimosa Pack. Occurs rarely in eastern Canada and from 
Coast to Coast in northern United States. Its hosts are recorded 
as poplars, especially trembling aspen, and willow. Full-grown 
larvae are lead-colored with a purplish tinge and about 43 mm. 
long. The body segments are slightly smaller at the middle, and 
the eighth segment bears a well-developed horn. Larvae are 
present from July to October, depending on locality, and the 
winter is spent as a pupa in the ground. There may be one or two - 
generations per year. 
Lophodonta angulosa (J. E. Smith) occurs from southeastern 
Canada to Florida and Texas and feeds on various species of oaks. 
Full-grown larvae are pea green and about 37 mm. long. The body 
is marked with a faint, double, whitish line down the middle of 
the back, and a distinct reddish stripe down each side. Larvae 
may be found from May to October, and winter is spent in silken 
cocoons on the ground. There are two generations per year in the 
South, but only one in the North. L. ferruginea Pack. occurs on 
paper birch in the Northeastern States and southeastern Canada. 
Nadata gibbosa (J. E. Smith) occurs from Coast to Coast in 
southern Canada and throughout the United States. The larvae 
feed on the foliage of a wide variety of deciduous trees such as 
various species of oaks, red and sugar maples, beech, paper birch, 
and willow. Full-grown larvae are pale pea green, have large, 
rounded heads and tapering bodies, and are about 43 mm. long. 
The spiracles are deep red, and there is a yellowish stripe along 
each side. Larvae may be found from May to October, and winter 
313 
