856 
LEPIDOPTERA. 
or May it makes an oval blackisli cocoon, composed chiefly 
of the hairs of its body, and comes forth in the moth state 
in June or July. 
My specimens remained in the chrysalis form five weeks; 
but Mr. Abbot* states that a caterpillar of this kind, which 
made its cocoon in Georgia on the 24th of June, was trans¬ 
formed to a moth on the 5th of July, having remained only 
eleven days in the chrysalis state. The moth is the Arctia 
Isabella^ or Isabella tiger-moth, and it differs essentially from 
those which have been described in the antennae, which are 
not feathered, but are merely covered on the under side with 
a few fine and short hairs, and even these are found only in 
the males. Its color is a dull grayish tawny-yellow; there 
are a few black dots on the wings, and the hinder pair are 
frequently tinged with orange-red ; on the top of the back is 
a row of about six black dots, and on each side of the body 
a similar row of dots. The wings expand from two inches 
to two inches and three eighths. The specific name, which 
was first mven to this moth by Sir James Edward Smith, is 
expressive of its peculiar shade of yellow. 
We have a much smaller tiger-moth, with naked antennas 
like those of the Isabella. Its wings are so thinly covered 
with scales as to be almost transpar¬ 
ent. It has not yet been described, 
and it may be called the ruddle tiger- 
moth, Arctia rubricosa (Fig. 171). 
Its fore wings are reddish-brown, 
with a small black spot near the 
middle of each ; its hind wings are dusky, becoming blacker 
behind (more rarely red, with a broad blackish border be¬ 
hind), with two black dots near the middle, the inner margin 
next to the body, and the fringe, of a red color ; the thorax 
is reddish-brown ; and the abdomen is cinnabar-red, with a 
row of black dots on the top, and another row on each side. 
It expands about one inch and one quarter. This moth is 
Fig. 171. 
* Insects of Georgia, p. 131, pi. 66. 
