64 ENDR0M1S VERSICOLOR. 



often sleeping side by side contentedly like so many fat 

 pigs ; but when awake they made good use of their time, 

 consuming a great quantity of birch, and their growth 

 was commensurate, for by the 26th of June some were 

 2 inches 3 lines in length, others, later, as much as 2 

 inches 7 lines, and bulky in proportion ; the head very 

 small, with the thoracic segments rapidly tapering to 

 it, and retractile as in Ghoerocampa, though to a less 

 extent. 



The middle of the body is rather the thickest, and 

 the twelfth segment, with its humped elevation, bluntly 

 pointed and slightly divided, slopes backward at an 

 angle to the anal flap ; the ventral and anal prolegs are 

 developed much after the fashion of Smerinthus ; the 

 other segments are lightly subdivided into four nearly 

 equal portions by slight wrinkles, the segmental 

 divisions more strongly defined, especially on the belly. 

 The skin is soft and smooth, glistening on the head, 

 which is green, and has two whitish or yellowish-white 

 stripes beginning on either side, and continuing to the 

 end of the thoracic segments, the uppermost as a sub- 

 dorsal, and the lower as an inflated spiracular stripe ; 

 the back is pale opaque green, slightly inclining to 

 yellowish in the lightest, and to bluish in the deepest 

 portions and in the dorsal line ; below the yellow 

 stripes, which are bordered above with green, the 

 ground colour of the sides is of a very deep and rich 

 full green, increased in depth by the close irroration of 

 minute black dots, and relieved by the white oval 

 spiracles delicately outlined with black ; in front of 

 these comes a thin line of quiet ochreous-greenish, as 

 though a continuation of the slanting stripe from the 

 preceding segment, more noticeable on approaching 

 the ventral prolegs, which, like the base of the anal 

 pair, are bright crimson ; the whitish-yellow stripe on 

 the side of the eleventh segment continues downward 

 beneath the spiracle on the twelfth. From the top of 

 the white horn-like hump, which is divided by a thin 

 line of black, a whitish stripe descends on either side in 



