5<i4 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
Larva btfort i<i*t molt.— Head large oval, flattened in front, narrowing towards the 
rertex, winch La slightly bilobed ; the head is wider than the thoracic segments ; the 
body is thiokesl <>n the Beoond and thud abdominal segments, <»n each of which is a 
thick fleshy conical soft tuberole, the apei falling over backwards ; they may be 
elevated andsomewhal enlarged or depressed, the anterior tubercle the larger of the 
two; the body is much humped dorsally on the eighth segment ; supra-anal plate 
smooth, much rounded; the anal legs Blender, not nearly BO thick as the other 
abdominal legs. General color pearly glaucous whitish gray, somewhat marbled 
with brown ; bead of the same color, marbled with brown; a broad faint lateral band 
shaded behind with white. A brown dorsal line extends from behind the bead to 
apex of second tubercle on third abdominal segment; thence a faint vascular line 
extends to end of supra-anal plate. The hump on eighth segment pale rust yellow- 
ish-red on sides, deeper above in the middle. A pale pinkish stigmatal line. 
Length, 20 mm . 
Mature larva. — Does not differ except in size from previous stage. Under side of 
body dusky ; the pale lilac lateral line sends a branch down the middle of the feet 
on the sixth abdominal segment. Length, 40 mm . For description of the moth see 
p. 456. 
15. Schizura unicornis (Abbot and Smith). 
This species is common both on the willow and thorn late in August 
in Maine. August 28 one had spuu a slight cocoon, but up to Septem- 
ber 4 had not pupated. 
The dorsal hump is not so soft and retractile or sensitive as in the 
larva of the following species : 
Larva. — Has a shorter smaller dorsal retractile than in Ccelodasys. Thoracic seg- 
ments pea-green ; the dorsal -shaped mark on the seventh segment is prolonged to 
the front edge of the sixth segment, this part really forming a separate narrow V, in 
front of the apex, of which on each fourth and fifth segments is a dusky brown patchy 
between the reddish-brown piliferous warts. Length, 25 mm . 
Before the last molt the larva is the same as mature form. Length, 15 to 18 mm . 
1(5. Schizura larva. 
(PL v, fig. 3.) 
Several caterpillars of this species were found on the willow at Bruns- 
wick, August 25, by Mr. H. H. Wilder. This caterpillar has a retractile 
horn (much more slender and retractile than in the one on thorn bush) 
on the first abdominal segment, which may be partially telescoped in- 
wards or invaginated, forming three false joints, and the fork at the 
end is composed of two movable piliferous slender tubercles which 
slightly diverge more or less. 
Larva. — Head very largo, high, narrowing and bilobed above; on first abdominal 
segment an unusually high horn or soft tubercle, forked at the end, the horn 
itself being extensible; on the eighth abdominal segment a high double conical tu- 
bercle; aual legs slender, as usual in the genus ; abdominal segments 2 to ? with two 
dorsal piliferous -varts, those on fourth and fifth segments much larger than the 
others. Body rust-red, pale green on the side of the three thoracic segments and 
edged above with white; on the back, between the first and third, there is a broad 
diffuse whitish lilac baud; a distinct large V-shaped yellowish-white mark on the 
seventh abdominal segment; and two concolorous dots below the seventh pair of 
abdominal spiracles. Length, 20 mm . 
