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INSECT ENEMIES OF EASTERN FORESTS ol 
The larva of Trichiocam- 
pus irregularis (Dyar) is 
nearly 34 inch long when 
fully grown. The head is 
almost entirely black. The 
body is yellow, sparsely 
hairy, and on each side is a 
subdorsal row of large black 
spots, beneath which is an- 
other row of black spots, the 
latter partially coloring the 
area containing the spira- 
cles. This species has been 
recorded from Rhode Island : : sae a: 
and Connecticut and north. Pent 100—Lanvae of Prickioenmpns vim 
ward into Canada. Willow Agr. Expt. Sta.) : 
is its food plant. It has oe- 
casionally been reported as abundant locally in Maine, usually on one 
tree or on a small group of trees. The larvae feed gregariously and the 
hfe cycle is very similar to that of 7. viminalis. 
The bristly rose slug (Cladius isomerus Nort.) is greenish white 
and is clothed with long rather stout bristles. It is about 5g inch 
in length when full grown. This species is distributed throughout 
the northeastern part of the United States east of the Mississippi 
River, and in California. It is probably the most serious defolator 
of wild and cultivated rose bushes. The newly hatched larvae usually 
begin their feeding on the underside of the leaves, at first eating all 
but the upper epidermis of the leaflets, later skeletonizing, and finally 
eating all but the larger veins. According to Middleton (300), there 
may be as many as six generations annually in the vicinity of Wash- 
moveagoin, ID) (Ge 
SUBFAMILY NEMATINAEB 
The full-grown larva of the maple petiole borer (Caulocampus 
acericaulis (MacGillivray), is about 14 inch in length and resembles 
a weevil larva. The head of the young larva is yellowish and the body 
whitish, but in older specimens the head is hight brown and the body 
straw yellow (Britton, 57). This species occurs in Connecticut, Mas- 
sachusetts, New York, and New Jersey, but the limits of its distribu- 
tion are not definitely known. The larvae bore or tunnel in the petioles 
or leaf stems of maple, causing the stems to break a short distance from 
the leaf blade and the leaves to fall late in May or early in June. 
Although this causes considerable alarm in heavy infestations on shade 
trees, the sawfly rarely, if ever, becomes abundant enough to cause 
severe injury to the trees. 
There is one generation each year. The adults emerge early in 
May and the eggs are laid near the bases of the petioles of maple 
leaves. On hatching, the larvae tunnel in the stems for about a month. 
After the petioles break and the leaves fall each larva continues to 
feed for a week or 10 days in that portion of the stem remaining on 
the tree, when it also drops and the larva vacates the tunnel to enter 
the ground. Transformation takes place in a cell formed 2 or 3 
