MY 111 LOIS OKI BRUM. 235 



rently almost full-grown, so I described them at once 

 as follows : 



Length when at rest about three-quarters of an 

 inch, and when crawling quite an inch ; rather 

 plump, and of nearly uniform width throughout; head 

 highly polished, considerably narrower than the second 

 segment; body cylindrical, tapering very slightly 

 towards the anal segment ; the segmental divisions 

 well marked ; there is a polished plate on the second, 

 and a smaller one on the anal segment; skin rather 

 soft, with a semi-translucent appearance ; a short hair 

 springs from each tubercle. 



The ground colour is a very pale olive-green, 

 inclining to drab ; the head and frontal plate are 

 intensely black, the small anal plate not so conspi- 

 cuously dark. A darker shade of the ground colour, 

 broadly bordered on each side with dull whitish 

 stripes, forms the dorsal band ; the subdorsal stripes 

 are white, but there are no spiracular lines ; the 

 spiracles are round, and they, and also the tubercles 

 and hairs, are black. The ventral surface and prolegs 

 are very pale dingy greyish -green ; the legs black and 

 polished. 



It feeds in the dried stems of thistle, eating neat 

 circular holes through to enter a fresh stem, or to 

 quit an old one. When full-grown it spins a net-like 

 cocoon of white threads in the cavity formed by having 

 eaten away the pith in the stem, and in this it changes 

 to a pupa. 



The pupa is about five-eighths of an inch long, 

 slender, and of the ordinary shape; the eye-, leg-, 

 and antenna-cases are prominent, the last especially 

 so, being raised quite on the top of the thorax, and 

 extending from the head to the base of the wings ; 

 there are also two slight prominences extending over 

 the base of the wings in front. The ground colour is 

 almost uniformly bright glossy pale brown, the upper 

 side of the thorax, segmental divisions, and side 

 tubercles rather darker brown. 



