THE LARCH LAPPET MOTH. 899 
nately the larva? died in confinement, the description is here given with a 
view to future identification of the imago. 
Larva. — Body smooth, of even thickness, cylindrical. Head and body uniformly 
pale pea-green. Four broken dorsal white stripes. Sutures tinted straw-yellow. Tho- 
racic feet greenish amber ; abdominal feet green. Spiracular line white and yellow, in- 
closing the distinct reddish spiracles. Supra-anal plate broad triangular; as long as 
broad and pointed ; surface roughened at the end. Length 20 mm . 
16. Geometrid caterpillar. 
This larva occurred on the hackmatack in Brunswick August 30. By 
September 25 it became fully grown, and commenced to pupate. The 
fully-grown larva differed in being not so much humped as the young 
larva described below. Unfortunately it did not live through the 
winter. 
Young Larva. — Length, 20 mm . Body slender cylindrical, a little thickened on pre- 
anal thoracic segments. Head very deeply cleft ; as wide as the body in the middle, 
but not so wide at the prothoracic region. Prothoracic segment much enlarged, with 
a hump on each side of the front edge. On fifth abdominal segment a pair of very 
prominent lateral long tubercles and legs moderately large, the dorsal acute tuber- 
cles of moderate size. Body dull brick-red, with a squarish patch on the front of each 
segment marbled with black and whitish. There is a median black line on the thoracic 
region. Body glaucous grayish, white under the last third of abdomen. It may be 
recognized by its dull brick-red body checked with dark, the humped prothorax, 
and two prominent tubercles on the fifth abdominal segment. No warts or papillae; 
the body a little wrinkled. 
17. Geometrid larva. 
This caterpillar occurred on the hackmatack, in Maine, June 27 to 28. 
Larva. — Body very long and slender, exactly mimicking a slender dark twig. Head 
very large, much wider than the body, being unusually large in proportion to the 
body ; full, rounded, but somewhat flattened ; in front black, with two short brown 
stripes on each side of vertex ; antennas whitish flesh-color; sides of head mottled with 
brown and black. Thoracic feet flesh- colored, mottled with black spots. 
A high double transverse black tubercle on fifth abdominal segment. Two small 
round black mamillae-like warts on penultimate segment. Last segment very large 
and broad; pale horn-brown. Supra-anal plate five-sided with 6 piliferous warts on 
the edge, 2 on the apex behind ; 4 black small high rounded warts on back part of each 
segment, arranged in a square ; 2 fine, light, not distinct supra-stigmatal lines. Lateral 
raised ridge distinct. Abdomen beneath reddish, with 7 to 8 black warts at the end 
of each segment. From all the warts arise short, upright, stiff hairs. Length, 18 mm . 
18. Geometrid caterpillar. 
This caterpillar occurred at Brunswick, July 19. Beginning to pu- 
pate among leaves and becoming a pupa the 21st. Also found on the 
hackmatack in a following year in the middle of July ; it will feed on 
the fir. 
Larva. — Body smooth, of even thickness throughout. Head as wide as the body, 
smooth; sides rounded; sutures well impressed. Head deep blood-red, black on 
the sides, while the entire clypeus is bright green. Body bright green, exact color 
of leaves, with a distinct dark, firm, almost black, stripe along the side, edged above 
