30 
Descriptive. — Young larva. — Head large, deeply notched, each tubercle distinctly 
conical ; body cylindrical, slender, with no tubercles ; a little smaller in the middle 
than at each end. Head and body uniformly of a dull, brick-red. Length 13 to 
|4mm i 
Larva before the last molt. — With the characters of the adult larva ; salmon red. 
Length 35 mm . 
Mature larva. — Twig-like, head very deeply notched, each side above conical ; the 
face flat in front, the surface granulated. Prothoracic segment raised in front into a 
large granulated piliferous tubercle. On the fifth abdominal segment a pair of large 
lateral rough tubercles, a little paler than the body; on the 8th segment a pair of 
converging pale granulated tubercles. Anal legs very large and broad, with a pair 
of long dorsal sharp fleshy tubercles ; supra-anal plate very large, conical and acute, 
with four setae near the apex. Body of even width throughout, reddish-brown, like 
a reddish willow twig, or sometimes greenish. The surface finely granulated with 
light and black, and w T itli flat rough warts, paler in color than the rest of the body; 
our on the front edge of each segment, and two dorsal ones behind. It varies in 
color from reddish-brown to green, thus mimicing willow twigs of different colors. 
Length 55 min . 
Pupa. —Large, full, stout; dark brown. Cremaster large, stout, a projection on 
each side in the middle, beyond rounded, sharp, the point ending in a slender fork. 
Length 24 mm . 
Moth. — A large stout-bodied moth, with heavily pectinated antennae and rather 
small wings. Fore wings narrow, with the outer edge longer than usual; pepper and 
salt or ash sprinkled with black brown; an indistinct, diffuse, inner, curved line, 
with a second one nearer and diverging a little on the costa, being nearer together 
at the base. A third diffuse line encloses the discal spot. An outer distinct black 
hair-line always present. Hind wings with three dark lines. Abdomen with two 
rows of obscure black spots. Expanse of wings 60 mm . 
ICHTHYURA STRIGOSA Grote. 
The caterpillar of this interesting species was found July 30, at Bruns- 
wick, Me., feeding on the Aspen ( Populus tremuloides). It moulted 
August 10, and about the 20th began to spin a silken cocoon between 
two leaves. The moth (a male) appeared in the breeding cage at Prov- 
idence, May 20. Like I. americana , it sits with the wings folded sharply 
over the back, with the fore legs held straight out in front, with the 
tufted tail curved up. 
Descriptive. — Larva before the last molt. — Head broader than the body, flattened 
in front, dull black, with long white hairs. Body flattened, with yellow and reddish 
longitudinal stripes; three dorsal faint red stripes on a yellowish ground, and three 
deep lake-red lateral stripes, the lowermost the broadest and deepest in hue. Two 
bright yellow lateral stripes. Five pairs of flesh-colored abdominal legs, the legs pale 
amber, colored like the under side of the body. Length 9 mm . 
Larva after the last molt. — Markings much as in the previous stage. Length 17 to 
18 mm . 
The rude cocoon is formed by tying a few leaves together, gathering them by a web 
at the edges, thus forming a roomy chamber, partly lined with silk, within which the 
chrysalis rests. 
Pupa. — Smaller and not so full and rounded at the end as in I. inclusa ; cremaster 
as in that species, ending in two stout, very short, recurved spines. Length 12 mm . 
Moth. — One male. Smaller and duller brown than I. indentata Pack. Palpi whit- 
ish below, dark-brown above, as in I. indentata (which closely resembles Fitch's /. 
vau) ; front of head slightly broader and squarer ; median thoracic brown band as in 
