A Sawfly Injurious to Young Pines. 5 
APPEARANCE, LIFE, AND HABITS OF THE INSECT. 
The needles are eaten by small larvee one-eighth of an inch long 
when young to three-fourths or seven-eighths of an inch in length 
when full grown, which feed in 
colonies or groups. The young 
larve (fig. 3) are pale, whitish to 
leaden white, and unspotted, with 
the head brownish; but they 
change in appearance through a 
series of molts (five for the male 
and six for the female), becom- 
ing yellowish-white with a num- 
ber of rows of black spots on the 
body (fig. 4) and with the head 
dark brown to orange. These 
larve have three pairs of legs on 
the thorax and eight pairs of 
smaller legs on the abdomen, 
and the head has only a single 
Fic. 3.—Young larve of Leconte’s saw- 
second and third stages. Your 
times natural size. 
pair of eyes, situated one at 
each side in a rather large, circular, blackish spot. 
Fic. 4,—Larvie of Leconte’s sawfly, fourth and fifth 
stages. Four times natural size. 
The larve are found 
clustered in colonies 
feeding on the pine nee- 
dles and occasionally 
on the tender bark (fig. 
5) of the young twigs. 
When full grown 
the larve spin cocoons 
from which they 
emerge later as adults. 
Adult emergence is di- 
vided into two periods, 
a first issuance, brood 
A, and a second issu- 
ance, brood B. When 
the eggs are laid and 
hatch in the late spring 
or early summer, adults 
of brood A issue from 
the cocoons in the late 
summer and early fall 
of the same year; but adults of brood B from this batch of eggs 
do not issue from their cocoons until the late summer and early fall of 
75613°—22——_2, 
