THE LARCH WORM. 887 
down on the side, while the black spines on the abdominal segments are distinct and 
arranged as in the full-fed worm. Length, 12""". 
Larva of fourth and hint stage (PI. IX, Fig. 1&). Length at first. 14-16 n,m . Body 
with three pairs of black thoracic and seven pairs of abdominal legs, the color of the 
under side of the body. (The larva may be distinguished from Lophyrus worms by 
having one pair less of abdominal legs, the latter haviug eight pairs.) Body rather 
long and slender; less plump than in Lophyrus abietis. Head round, jet black (it is 
usually reddish in Lophyrus); seen from in front, iegularly circular, mandibles 
4-toothed; maxilhe 4-jointed, the joints longer than in Lophyrus; the mala or inner- 
most lobe broad and large at the end, with about ten stiff long seta3 (in Lophyrus the 
mala is much smaller, with only three very short seta? or stiff spines). The body is 
of a peculiar glaucous-green color, like that of the under side of the leaves ; the glau- 
cous-green dorsal region is plainly separated from the paler under side of the body by 
a definite line. There are no lateral stripes or spots. The first three (thoracic) seg- 
ments behind the head are plain, with no minute warts; but around each abdominal 
segment except the last run two parallel double rows of minute dark dots or warts. 
The worm is at once distinguished from any other saw-fly larv;e, on pines, spruce, 
and firs, by its larger size, its color, and by its jet-black head and its seven pairs of 
abdominal legs. 
Cocoon. — Larger an 1 darker than that of Lophyrus abietis. Leugth, 10 mm ; diam- 
eter, 5 mm . 
The imago or saw-fly (5 females).— A very large, thick-bodied, black species, with 
abdominal segments 2 to 5, and part of the sixth, bright resin-red. 
Head black; maxillary and labial palpi pale whitish flesh-color. Antennae tapering 
to the end, black, 9-jointed ; the scape with two small short joints, the second shorter 
than the first ; the flagellum 7-jointed, the second joint considerably shorter than the 
first, and slightly longer than the third ; fche two terminal joints of equal length and 
slightly paler than the rest of the antennae. The clypeus and especially the labrum 
covered with white, stiff, short hairs, as also the genae in front. Head and thorax 
uniformly black, under the triplet seen to be pilose. Basal segment of the abdomen 
black, segments 2 to 5 bright resinous red, including the basal third of the 6th, this 
segment beneath being entirely red. 
First and second pair of legs, including the trochanters, pale flesh color, the femora, 
however, somewhat reddish and tipped at the distal end above with black ; the third 
pair of femora red, like the abdomen, black at tip ; tibiae pale, black on the outer 
third ; tarsi black, the under spines pale, including the base of the claws. End of 
abdomen and ovipositor black. Wings with the costa as far as the stigma reddish ; 
stigma and veins black. Only three subcostal cells, the basal squarish one not being 
completed, a short obsolete vein projecting from near the stigma. 
Length of body, ll mm ; of antennae, 6.5 mm ; of forewing, 9 mm : expanse of wings, 20- 
21 mm . One specimen considerably smaller than the others. 
Remedies. — It is obvious that in swamps in the remoter parts of the 
country these worms can not be subdued ; they will run their course 
for a term of years. To prevent their killing shade trees, particularly 
small oues, jarring the trees will prove a good remedy, the worms once 
shaken off the tree can not ascend the trunk, as they do not, like canker 
worms, climb trees or let themselves down by a thread. Small trees 
may also be showered with solutions of Paris green, or the various 
fluid insecticides recommended in the recent reports of the Entomolo- 
gist of the Department of Agriculture and in the Introduction to this 
report. 
Parasites. — A number of cocoons sent us in 1882 by Mr. Atkins were 
