ELM CATERPILLARS. 273 
After third molt. — July 22. Clear light pea-green. A subdorsal yellow band 
growing faint on segments 9 and 10. A conspicuous mottled, dark red brown dorsal 
patch on segments 4, 7, 11, edged posteriorly and externally with yellow. A tine lat- 
eral white line. Two small dorsal reddish patches on segment 1. Setiferous tuber- 
cles yellowish, bearing a few long whitish hairs. Head green anteriorly, mottled 
reddish posteriorly. Legs and prolegs green. Length, 10 mm . 
After fourth molt. — July 26. Dark yellow green above, blue green below ; colors 
brighter than in the preceding stage. Lateral line broken and inconspicuous; other- 
wise as in the preceding stage. Length, 18 mm . 
After fifth molt.— Colors more intense, the yellow and red of the dorsal spots con- 
trasting strongly. In a few specimens segment 8 has in all the above stages a dorsal 
spot less conspicuous thau the rest; otherwise as in fifth stage. Larva, 30 mm . 
After sixth molt, larva full fed. — General color mottled-brown and greenish Tike the 
bark. A dorsal black band contracted between each segment, containing a central 
dorsal white line. On segments 4, 7, 8 this band forms a trans verbe dorsal hump, 
edged with deep black and set with a few short white hairs. Above and below the 
stigmata are white setiferous tubercles bearing whitish hairs. Segments, 1, 2, and 
3 are set with tubercles bearing longer hairs than the others, which are directed 
anteriorly. A diagonal black mark suffused on segments 1, 2, 3 runs superiorly and 
posteriorly just above the stigmata. The latter black ringed with white. Head black 
anteriorly, dull carmine or orange posteriorly, with a central, arrow-shaped light- 
brownish mark, and with several lateral whitish streaks. Legs greenish ; prolegs 
black. Beneath dirty greenish. Length, 50 mm (2.00 inches). (Thaxter). 
Moth. — Fore wings pale gray, the marks and lines with olivaceous shadings. 
An elongate narrow black streak along the median nervure, extending to the 
outer line of the transverse anterior and heavily shaded beneath with olivaceous. 
Transverse anterior line geminate, the lines wide apart on the costa, olivaceous, the 
inner marked with black scales along its middle. Orbicular spot small olivaceous. 
Reniform spot greenish ocherous. Hind wings smoky gray. Expanse of wings 44 mm 
{1.76 inch). A little smaller than A. lobeliae and paler colored. Easily distinguished 
by its ocherous olivaceous shadings, and by the absence of the black dash on the 
disk which connects the ordinary spots in A. lobelice. (Grote.) 
45. Apatela vinnula Grote. 
According to Mr. Thaxter this species feeds on the elm. 
46. Apatela ulmi Harris. 
This species was reared by Dr. Harris. It becomes fully fed by the 
middle of September in northern New England, and spins a tough 
cocoon, the moth appearing the second week in June (Harris's Corr.). 
We have found it on the elm September 15, in Maine. 
Larva,. — Head large, as wide as the body ; black, with a deep red patch on each side of 
the vertex above ; clypeus with a V-shaped white spot ; between the forks of the V a 
white line leading to the white labrum ; basal joint of antennae white, rest jet black. 
Body thick, with three fleshy, black, conspicuous transverse dorsal humps, one on 
first, sixth, and eighth segments. From the eighth segment a black median dorsal 
line extends to end of body ; in front a white-gray median line extends to head, and 
is edged broadly with black; four unequal whitish warts on each side of each seg- 
ment ; from them stand out on each side long white hairs, nearly as long as the body 
is thick. From each uppermost tubercle only short hairs radiate. The top and 
sides of the body also rough with phort white thick hairs. Thoracic feet black ; 
abdominal ones, pale flesh-colored. Anal legs striped slightly and irregularly on the 
outside. Behind the head on thoracic segments and on the tail a few erect long 
white hairs. Length, 32 mni . 
5 ENT 18 
