428 
LEPIDOPTERA. 
outer hind margin, of a deep purple-brown color ; the band 
is edged internally with olive-green, and marked towards 
the edge with a slender wavy white line ; near the middle of 
the wing, and touching the brown stripe, are two brown 
spots, one of them round and the other kidney-shaped ; and 
on the middle of the inner margin there is a large triangular 
olive-colored spot ; the under side of the same wings is yel- 
low, and near the middle there are a round and a kidney- 
shaped black spot. The hind wings are yellow above and 
beneath ; on the upper side with a broad purple-brown hind 
border, on which there is a wavy white line, and on the un- 
der side with only a central black dot. The head is black. 
Alono- the middle of the thorax there is a broad crest-like 
O 
stripe of black and peai-l-colored glittering scales. The 
shoulder-covers are white. The upper side of the abdomen 
is yellow, with a row of black spots on the top, and another 
on each side ; the under side of the body, and the large muff- 
like tufts on the fore legs, are white ; and the other legs are 
black. This moth rests with its wings closed like a steep 
roof over its back, and its fore legs stretched forward, like a 
Cerura. It expands from one inch and a half to one inch 
and three quarters. 
Eudryas unio, of Hiibner, the pearl Eudryas, as its name 
implies, is a somewhat smaller moth, closely resembling the 
preceding, from which it differs in having the stripe and 
band on its fore wings of a brighter purple-brown color, the 
round and kidney-shaped spots contiguous to the former also 
brown, the olive-colored edging of the band wavy, with a 
powdered blue spot between it and the triangular olive- 
colored spot on the inner margin, and a distinct brown spot 
on the inner hind angle of the posterior wings ; all the wings 
beneath are broadly bordered behind with light brown, and 
the spots upon them are also light brown. It expands from 
one inch and three eighths to one inch and a half. This spe- 
cies has been taken in Massachusetts, but it is rare, and the 
caterpillar is unknown to me. 
