ELM CATERPILLARS. 273 



After third molt. — July 22. Clear light peagreeu. 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 fine 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 greeu. Length, 10""". 



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""". 



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 than the rest ; otherwise as in fifth stage. Larva, 30™"". 



After sixth molt, larva full fed. — General color mottled-brown and greenish Rke 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 transverse 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""™ (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™"* 

 (1.76 inch). A little smaller than A. lohelice 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. lobelia'. (Grote.) 



45. Apatela vinmila 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 

 <iocoon, 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 antennse 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 short 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™"'. 

 5 ENT IS 



