Packard.] 
102 
[May 7, 
some European Lepidopterists referred to Bombyx, are really species 
of Lasiocampa, with no very near relationship to Bombycidse) in 
sensu restricto , have a sphinx-like horn on the eighth abdominal 
segment. This feature they may have inherited from the Notodon- 
tians independently of the Saturnians. 
The ontogeny of Endromis may prove interesting ; the larva is 
certainly quite sphinx-like, in the general shape of the body, in the 
oblique stripes, and the humped eighth abdominal segment, though it 
is hornless. Neither in its larval nor imaginal character, especially 
its venation (it has lour branches to the median vein), does it very 
nearly approach the Saturnians, for it even approximates the Arc- 
tians in some respects. It seems to represent an independent 
group. 
Turning now to the Notodontians, we have larvae which exhibit 
all grades from the smooth, unarmed noctuiform caterpillars of 
Nadata and Lophodonta, to those which are variously humped, 
either singly or doubly, and on one segment onty,or on all the ab- 
dominal segments except the ninth and tenth. The group, as regards 
its larval forms, is a remarkably plastic one, while on the other 
hand the moths themselves are very much alike, showing great 
uniformity of structure. The larvae of Plieosia (Leiocampa) are 
most remarkably Sphinx-like, especially our P. rimosa , in which 
the hump is surmounted by a dark, conspicuous horn. In our (Ede- 
masia, etc., and the European species of Lopliopteryx the hump 
and horn of Plieosia are represented by two conical tubercles. This 
might appear to indicate that the single horn is derived from two 
separate ones. 
In the subfamily Hemileucini, represented by Hyperchiria, Pseu- 
dohazis, Hemileuca and other American genera, the body is covered 
more or less densely with spinulated or branched spines, and in 
all these genera the arrangement of the spiniferous tubercles is the 
same, the generic differences consisting in the shape and size of the 
spinulated spines. In stage i of Hyperchiria io the dorsal spines on 
all the segments are large and much alike, except that those on the 
abdominal segments are not branched, with the exception of the 
dorsal median spine on the eighth and ninth abdominal segments, 
which are similar to those on the thoracic segments ; in Pseudoha- 
zis the median spines on the eighth and ninth abdominal segments 
are not forked, but spined. The single median spines persist in 
the second and third, and later stages of H. io on both the eighth 
