No. 125.] 467 
feet specimens (fig. 2) two bands, the inner one continuous, and the 
outer composed of sub-confluent spots, extend across both pairs of 
wings, but of a paler shade on the posterior pair, the inner one be¬ 
ing here extremely faint. These bands are placed at equal distances 
from each other, and from the base and the outer margin. At their 
commencement on the forward margin of the anterior wings they are 
commonly of a ferruginous color; and there is also a small ferrugi¬ 
nous dot on the middle of the forward margin, and a slight line op¬ 
posite to it on the posterior margin. The basal third of the anterior 
wings, including all the space inside of the inner band except upon 
the forward margin, is of a leaden-brown color. In most specimens, 
however, (fig. 1) the several marks above described are obliterated 
to a greater or less degree. A pale brown inner band, three spots 
in the middle of the outer band, the middle one larger, with a 
. brownish dash opposite them on the anterior margin, and on the 
hind wings one or two pale spots forward of the middle of the outer 
margin, are the only obvious marks commonly presented. And in 
yet other specimens, these spots are faint, and the inner band en¬ 
tirely disappears. The under side of the wings is similar to the 
upper, but in most cases more copiously marked with leaden brown, 
the entire basal half of the wings, except on their anterior margins, 
being here overspread with that color, traversed with light yellow¬ 
ish lines upon the nerves. The outer band of spots aTso, is here 
often very perfect when it is nearly obliterated upon the upper 
side. 
The antenna are more than half the length of the body. In the 
males (fig. 8), they are strongly bi-pectinated to their tips, the ro¬ 
bust branches which issue from near the apex of each joint on each 
side, being furnished with minute hairs or bristles, of which those 
on the anteiior side of each branch are longer and more erect. In 
the females, they at first view appear to have a row of processes, 
somewhat like the teeth of a saw, projecting upon one side only 
(fig. 10); but when carefully turned, to bring the face of the an¬ 
tenna fully in view, a corresponding row of teeth is exhibited upon 
the opposite side (fig. 9), showing that these organs in this sex are 
bi-serrated. Indeed, they only differ from the male antennae in 
being destitute of the lateral branches or pectinations, the main 
stalk of the male antenna being bi-serrated, or showing a projecting 
tooth on each side of the apex of the joints, the same as in the 
female. 
The palpi (fig. 7), enveloped in seales to their tips, project mode¬ 
rately forward and upwards, being obvious to the naked eye, in a 
dorsal view of the insect (figs. 1 and 2). 
