TWO INSECTS OF THE ORCHAED SNODGEASS. 509 



Plate 3. 

 The ribbed-cocoon-niaker. 



A. Caterpillar weaving the carpet for its cocoon, showing the figure-S loops 



of the thread (X7). 



B. Side view of the head and prothorax of a spinning caterpillar, showing the 



thread issuing from the spinneret (a) on the underlip (greatly magnified). 



C. Caterpillar constructing the palisades that will surround the cocoon. 



D. Caterpillar spinning first part of the ribbed cocoon (X7). 



E. Caterpillar finishing the outer walls of the ribbed cocoon. 



F. Diagrammatic vertical section of the finished cocoon on under side of its 



support after the caterpillar has changed to a pupa ; 6, the support ; c, the 

 outer wall of the cocoon ; d, the inner wall ; e, the pupal chamber ; f, the 

 anterior valvelike partitions ; g, the pupa ; h, the discarded skin of the 

 caterpillar. 



O. The cocoon opened from above (lettering as on F). 



H. The finished cocoon surrounded by its stockade of silk palisades. 



