Fig. 607.—The luna-moth, or pale empress of the night, Tropcea luna, 
(After Lugger; reduced about one-fourth.) 
being larger and red instead of black. It feeds on many kinds of trees, but 
Comstock has found it more frequently on ash and wild cherry than on 
others. The cocoon is long and slender and enclosed in a dead leaf whose 
petiole has been fastened to the branch with silk by the larva. “At the 
upper end of the cocoon there is a conical valve-like arrangement which 
allows the adult to emerge without the necessity of making a hole.” C. 
angulijera is a moth slightly larger than promethea , but otherwise hardly 
distinguishable from it except that the shape and markings of the wings, 
422 The Moths and Butterflies 
on body and wings, a whitish lunate discal spot and a white and purplish 
transverse bar on each wing, and body with longitudinal series of white 
tufted spots, has become common near several cities. 
The promethea-moth, Callosamia promethea , expanse 3 to 4 inches, light 
reddish brown in female, and blackish and clay color in male, with mark¬ 
ings as shown in Fig. 609, is perhaps the most abundant of all these giant 
moths. Its larva when full-grown is 2 inches or more in length; it is bluish 
green and the body bears longitudinal series of black polished tubercles, 
two of these tubercles on each of the second and third thoracic segments 
