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 



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. 

 angulifera is a moth slightly larger than promethea, but otherwise hardly 

 distinguishable from it except that the shape and markings of the wings, 



