﻿Makch 1895,] Packard. Life-history of Heterocampa obliqua. 21 



LIFE-HISTORY OF HETEROCAMPA 

 OBLIQUA Pcu-J^. 



By A. S. Packard. 



The eggs of a female of this species which is of the form 

 bruimca, were received from Providence, R. I , through the kindness 

 of Mr. W. Dearden, July 13, and hatched at Brunswick, Me., July 

 20 — 21. It feeds on the oak. It was reared at Brunswick. 



Egg. — Diameter, .9 mm. Of the usual hemispherical shape, 

 moderately flattened above ; shell under a lens seen to be finely 

 pitted or shagreened ; under ^ inch, a eye-piece, marked with 

 rather large hexagonal areas, with well marked, raised edges, but 

 not distinctly beaded. The hole eaten in one side by the larva 

 in escaping of the usual elongated kidney-shape. 



Larva, Stage I. — Freshly hatched. Length, 3.5 mm. Head 

 very large, much wider than the body, somewhat flattened in front ; 

 pitchy amber, smooth, unarmed, surface dull, not polished. On 

 the ist segment arising from a dark cervical plate is a pair of large 

 branching horns with three large equal curved tines, which are 

 pointed and densely spinose, the short stout spinules dark, quite 

 different from //. giittivitta. One tine points forwards, one back- 

 wards and one laterally outwards. The body is purplish reddish, 

 with no stripes or other marks, except a small pale yellowish 

 transverse dorsal spot in front of the base of the 8th segment. No 

 horns on the 2nd and 3rd thoracic segments. On the ist abdominal 

 segment is a pair of simple dark horns about as long as the seg- 

 ment is thick. On 2nd segment a pair of minute setce ; on 3rd a 

 pair of blunt spines one-half as long and large as those on the ist, 

 and a slightly smaller pair on the last (loth) segment. End of 

 body carried uplifted, and the two cylindrical anal legs blunt at 

 the end and entirely dark. Thoracic legs blackish; the four pairs 

 of middle abdominal legs dark livid. It molted July 27. 



Stage //. — Length, 6 mm. Head reddish brown. Now all 

 the horns have disappeared, those on the ist thoracic segment 

 only represented by two conical acute tubercles which are black at 

 the tip and slightly forked, there being a small black supplementary 

 spine on the inside of the main one. The two spines are wide 

 apart and project out laterally. On 9th abdominal segment are 



