Packard.] 
542 
[Feb. 19, 
tate a portion of the fresh-green, serrated edge of a leaf including 
a sere, brown, withered spot, the angular, serrate outline of the 
back corresponding to the serrate outline of the edge of the leaf. 
And as the leaves only become spotted with withered dead por- 
tions by the end of summer, so the single-brooded caterpillars do 
not, in the northern states, develop so as to exhibit their protective 
coloration until late in the summer, i. e., by the middle and last of 
August. 
A feature of some significance is the larg^e size of the prothoracic 
tubercles in the larva of the first stage of 8. ipomece , which in suc- 
cessive stages becomes reduced to a size no greater than those of 
the other thoracic segments. Is this a case of inheritance and sur- 
vival from such a larva as that of Heterocampa guttivitta (Walk.?) ? 
In this caterpillar, when mature, the only tubercles on the body are 
the separate high twin bright-red warts on the prothoracic seg- 
ment. 
THE LIFE-HISTORY OF JANASSA LIGNICOLOR, WALK. 
This caterpillar has been already well described in all its five 
stages by Mr. H. G. Dyar in “ Entomologica Americana” (v, 91, 
May, 1889). The points of special interest, noticed by Mr. Dyar, 
are : (1) That only five eggs in the case observed were deposited 
on the same plant; (2) the larvae feed singly and during stages I 
and II they “ eat only the upper portion of the leaf, and their yel- 
lowish-brown color well simulates its withered appearance ; (3) 
subsequently, they devour the entire leaf, with the exception of the 
largest veins and rest on its edge, where they might be mistaken 
for a curled and discolored portion.” 
Of the structural features and shape, as compared with the last 
stage of the first stage, Mr. Dyar gives no detailed account, ex- 
cept referring to a “ hump on joint 5,” i. e., the first abdominal seg- 
ment. 
In the second stage the head is said to be 64 slightly notched on 
top.” In stage III the important observation is made that “ the 
markings of the mature larva now begin to be assumed.” This is 
in accordance with what appears to be the rule in this group, i. e., 
that when the larvae reach stage III they feed more conspicuously, 
and then begin to arise the special protective shape and colors of 
the last stage and also the terrifying movable warts or spines, if 
present at all. 
