PCEOILOCAMPA POPULI. 59 



out and walking it tapered a very little in front and 

 rather more at the two hinder segments. 



The head was bluish-grey, freckled with reddish- 

 and brownish-grey ; the front of the second segment 

 margined with bluish-grey, followed by a fusiform 

 mark of brown divided dorsally by a pale line. On 

 the back of the other segments was a series of dark 

 grey blotches, bearing the forms of inverted urns ; 

 they were freckled with blackish atoms ; their apices 

 placed hindmost were the darkest. Through these 

 marks ran the darker dorsal line, and within them, on 

 either side of the dorsal line, were two acute angular 

 marks of bright ochreous-orange extending trans- 

 versely ; the sides below were somewhat crenulated 

 with curves of dark grey on a whitish ground, and 

 above them was a large blotch or suffusion of ochreous- 

 orange, freckled with dark grey and surrounded above 

 with a blotch in front and a larger blotch behind, of 

 squarish form, dark grey, finely freckled with blackish 

 like the curved blotches below. The oval spiracles 

 were blackish, with a narrow whitish centre but very 

 inconspicuous ; the ventral prolegs were pale grey, 

 streaked with darker grey, and tipped with brownish- 

 grey hooks. 



The dorsal marks on the third and fourth segments 

 were blackish and rather conspicuously relieved by a 

 marginal side blotch behind of whitish, which was but 

 faintly indicated on the other segments. On the third 

 and fourth segments were oblique side streaks of dark 

 grey downwards and forwards. At the end of the 

 sixth and beginning of the seventh segments the dark 

 dorsal blotches were relieved on either side by con- 

 spicuous large whitish blotches. The belly and inner 

 surface of the ventral prolegs were buff-yellow, and 

 each segment had a central black spot (much larger 

 on the leg-bearing segments) in the middle of the 

 body ; on either side of the front of the second seg- 

 ment was a round wart-like tubercle. The whole 

 upper surface of the body and head was covered with 



