118 _ POPLAR. [1899 



than two and a quarter inches in length from head to base of the 

 horn-hke tail processes. The colours had developed well, and, without 

 entering too tediously on details, might be said to show the customary 

 characteristics. The back was mostly of a purplish brown, darker at 

 the edges, and varied with minute white dots and longitudinal streaks. 

 The segment behind the head for the most part greenish in a transverse 

 band in the fore part (excepting the pinky colour above the face, and 

 dark patches at corners above the face), and the centre of the next 

 segments palish with somewhtit greenish tint. The face itself brownish. 

 My specimen proved to be one of the varieties possessing a dark 

 patch on the side, placed just below the lengthened angle of the dark 



Larva of Puss Moth before last moult ; also full grown, showing side mark.* 



dorsal stripe, and known together with it as the stirrup and saddle 

 flap. Mr. Hellins records "six good variations" in form of the flap 

 and stirrup, and that on my specimen must have been one of the most 

 marked mentioned, and there was also a dark spot on the side of the 

 next segment just above the sucker-foot. The abdomen was green, 

 deepest in tint at the lowest part of the sides, with two long dark 

 stripes running beneath from the fourth sucker-foot to the tail. 



The above details do not perhaps bear much on practical economic 

 considerations, still they may be of service in drawing attention to the 

 infestation before it gains its full-grown voracious conditions, and even 

 as matter of curiosity the main points of the changes appeared worth 

 record when I had the rare opportunity of observing them. 



Prevention and Remedy. — Excepting where the attack occurs to 

 very young trees or in nurseries, where, as noted at p. 116, the plants 

 are so small that they quite fail under attack, there seems to be little 

 need of taking measures against this infestation. 



* The above figure is mainly copied from that given at Plate xxxii. fig. 4, c, of 

 ' Larvi>? of British Butterflies and Moths,' but with comparison with my own 

 specimen. The smaller figure is copied from 4, b, of the same plate, and indicates 

 the appearance of the tubercles behind the head seen from above. 



