Studies on Life-history of Bombycine Moths. 



61 



the simpler shape, with much fewer plumules; b, the end of an ordi- 

 nary spinulated hair. 



Fig. 2. 



For comparison a plumose hair of Parorgyia parallela is repre- 

 sented in Fig. 3 ; a, a hair taken from the dorsal tuft on the 8th 

 abdominal segment ; b, a very long and slender hair from a pro- 

 Ihoracic tuft; c, the base of b; d a spike-like spinulated seta inter- 

 mingled with the plumose hairs of the dorsal tuft. 



Recapitulation of the more salient ontogenetic features. 



1. The two dorsal eversible glands become bright coral-red in 

 stage III. 



2. Appearance in stage III of the lateral prothoracic pencils, and 

 of the 4 dorsal abdominal tufts. 



3. The dense dorsal tuft on the 8th abdominal segment, consist- 



