Fia. 1. 
4, 
EXPLANATION OF PLATE XXII. 
Porthesia similis. 
Portion of larval skin shown in transverse section. 
C. Chitinous cuticle. 
S. Tufts of urticating spicules arising from cuticular 
papillae. 
E. Hypodermal cells associated with urticating spicules. 
P. White plume-like body. 
Sc. Socket of same. 
G. Gland at base of plume. 
Diagram of transverse section of larva (one half only). 
k. Large branched hairs or setae. 
S. Urticating spicules. 
P. Plume-like body. 
. Section of cocoon showing the band of urticating spicules 
(S) therein. 
Some of the hairs (modified scales) which form the “ gold 
tail”? in the 2 moth. Their basal or proximal ends (bd) 
are irregularly spinose and so hold the urticating spicules 
swept by the moth from the cocoon. 
(The corresponding structures in the ¢g are smooth 
throughout their length.) 
