PYRAL1S GLAUOINALTS. 25 



I separated this mass to look for the larvae, but 

 found that they immediately began again to construct 

 loose silken galleries, and thus reunited the various 

 materials of which it was composed. 



At this date the youngest larva was about half 

 an inch long, of a dull pale brownish olive-green ; 

 others were larger and darker, the colour darkening 

 with the growth, until the full-grown larva was almost 

 black. 



When full-grown the length is from l-^- to 1^ 

 of an inch ; the form is moderately slender, cylindrical, 

 nearly uniform in bulk throughout, the hinder segments 

 tapering a little at the sides ; the region of the spiracles 

 is puffed and wrinkled ; the segmental divisions are 

 deeply cut. 



The colour of the back is a blackish bronzy-green, 

 becoming paler, of an olive or ochreous-green tint 

 along the spiracles, and on the belly and legs, the 

 head, and the second and thirteenth segments ; the 

 plate on the second segment is margined in front with 

 blackish -olive ; a fine blackish undulating line, appa- 

 rently caused by a deep wrinkle, runs along below 

 the spiracles, which are inconspicuous, being of the 

 surrounding colour, and merely outlined with blackish ; 

 the tubercular dots are a little raised, each bearing a 

 fine hair; the whole surface is shining and bronzy- 

 looking. 



The first mature larva spun its cocoon on the 23rd 

 of April, 1869 ; the cocoon at first was soft and very 

 flexible, of a brilliant silvery whiteness, its yielding 

 surface readily betraying the movements of the larva 

 within, but after a day or two enough skin had been 

 spun to make it firm and unyielding; its length is 

 about five-eighths of an inch, its breadth two-eighths ; 

 in shape it is rounded at either end, very convex on 

 both the upper and under surfaces, these curves not 

 being continued round the sides, but meeting there 

 in an acute ridge. 



The imago makes its exit at one end, but the edges 



