274 
[October 
A. comparata^ A. Stmidingeri and A. septentrionali^^ of which the 
latter species as well as the one I have just described belong to Grroup 
1 Gruenee, a group characterized by the strongly pectinated antennae 
of the % and a certain similarity of ornamentation of the anterior wings. 
PLUSIA Ochs. 
In the collection of the Entomological Society of Philadelphia is a 9 
specimen belonging to the genus Plusla taken at Pike’s Peak, which, 
on a comparison of actual specimens, very closely resembles P. divergem 
Fabr. and P. devergens Hiib. from Europe, and although, after a care¬ 
ful examination I am induced to believe our species distinct, still a series 
of individuals from that locality may render evanescent characters 
which I now regard as of specitic value. I subjoin a description of our 
species, comparing it with the European, and proposing for it the name of 
P. ignea nov. sp. 
Anterior wings dark brown with the fringe, terminal and subtermi¬ 
nal spaces darker than in P. divergent. In the latter species the fringe 
is of a greyish-lilac hue which spreads towards the internal angle over the 
terminal space to the subterminal line. In P. ignea the terminal space 
is of an even brown color from costa to internal angle, wanting the 
brassy shade which spreads over both subterminal and terminal spaces 
in both the European species and the fringe has not the greyish-lilac 
color which it shows in P. divergent. The median space is tinged with 
bright reddish near the lower half of the transverse posterior line which 
is not the case in the specimens of both the European species I have 
before me. The metallic subcellular spot, though presenting the same 
general appearance, is broader and more rounded at its lower extremity 
than in P. divergent, Fabr. The black band on the posterior wings is 
broader and not so attenuated at the anal and external angles and the 
base of the wing is more clouded with black. The coloring of thorax, 
abdomen and under surface present no noticeable differences. The wings 
in our species are however relatively broader and the spur at internal 
angle more acute. P. ignea expands II inch., my specimen of P. 
divergent I inch. 
I append a list of the descriptions of our native Lepidoptera which 
I have published under the title of the present article, having corrected 
