SPRUCE SAW-FLIES. 839 
part of summer, and feeds separately, Dot being gregarious as in most 
species of Lophyrus or the Larch Nematus. It is possible that the fly 
escapes from the cocoon in the autumn, but as a rule it without doubt 
passes the winter in the cocoon, the fly making its appearauce in the 
late spring and early part of June, specimens having been found dead 
in the breeding-box in the middle of May. 
Larva.— The body is long, broader than the head ; pale pea-green ; of the color of 
the leaves of the spruce among which it feeds. The head is smooth, of the same 
color as the body, with a dark patch extending upward behind each eye. Body not 
spotted, but with a dorsal dark-green stripe, bordered on each side with whitish 
glaucous green. Along the body is a lateral conspicuous broad white stripe, the 
stripe much scalloped below. Body beneath and abdominal legs uniformly green; 
thoracic legs pale honey-yellow, except at base. Length, 17 mm . 
Cocoon. — Of the usual oval cylindrical form ; of a pale horn color, of the usual 
density, the walls being opaque. Length, 13 mm ; diameter, 4 mm . 
Saw-fly (imago) [two females]. — Antennae nine-jointed; ilagellum minutely hir- 
sute, seven-jointed, the two basal joints of flagellum equal in length ; head and body 
dull amber yellow (testaceous) ; eyes black ; ocelli situated in a dark-brown patch ; 
a black irregularly triangular spot above the insertion of each antenna, being situ- 
ated in a pit between the eyes and the inner edge of the broad orbits. A single 
minute triangular black spot between the antennae ; clypeus, labrum, and palpi pale 
dull amber (testaceous), concolorous with the head ; the mandibles dark at tips. 
Prothorax above not spotted. Mesonotum with three longitudinal, dark, broad 
stripes ; praescutum dusky reddish brown, pale on the sides ; on the middle of each 
half of the scutum a broad blackish band reaching the front edge, but not extending 
posteriorly behind a point parallel with the apex of the scutellum. Behind and be- 
tween the ends of these dark bands are two small dark spots. Scutellum on the 
posterior half dark brown ; the metascutum is black. Sides of the thorax and beneath 
pale faded amber (testaceous), with a triangular black spot on the sides of the pro- 
thorax below and in front of the wings. 
Abdomen of the same color as the rest of the body, but on the sides and beneath 
with a greenish tinge ; above black, especially towards the base, next to the thorax ; 
the segments above being banded transversely with black on segments 1 to 8, the 
bands growing shorter (transversely) behind, until on the eighth segment the dark 
band is scarcely wider than long ; the black bands extend on each side of the front 
edge of each segment, forming a point on each side. Under side of meso- and meta- 
thorax a little dusky. 
Fore and middle pair of legs testaceous ; extreme tips of tibiae and tarsal joints 
with a very narrow black ring ; last tarsal joint with the pad (pulvillus) and end of 
claws dark. Hind legs : femora in color testaceous ; tibiae a little dusky, paler 
towards the femora ; all the tarsal joints equally dusky, Ovipositor at base reddish 
horn color, tip blackish. Wings with the veins blackish brown ; costal edge paler: 
stigma dark testaceous ; four subcostal cells, the first or innermost four-sided, sub- 
quadrate. Length of antenna, f> mm ; length of body without antennae, 8 mm ; length 
of a fore wing, 8 mm . 
This agrees in all respects with Mr. Norton's description of Nematus 
integer Say, var. a (Trans. Amer. Ent., i, p. 216). It is recorded from 
Maine, Massachusetts, Connecticut, New York, Pennsylvania, and In- 
diana. It thus seems to be a widely distributed species. It is closely 
allied to Say's N. vertebratus and to Norton's N". trilineatus, but the pale 
fore and middle tarsi and the greenish tint distinguish it. The descrip- 
tion of the larva is taken from Bulletin 7, U. S. Ent. Comm., p. 234, 
No. 20. 
