876 Mr. F. Merrifield and Mr. E. 13. Poultoii cm 



tion, resemble the dcn^k yellow-green (I h). The purplish- 

 brown is increased in extent as is the green of the corre- 

 sponding form (1 h), the dark dorsal band becoming a 

 specially prominent feature Avhich contrasts strongly 

 with the appearance presented by the light grey pupae 

 (2 «)._ 



I will now apply the arrangement suggested above to 

 the results of ]\Ir. Merrifield's experiment. The pupse were 

 compared on May 2nd, 1899. Three of the 14 larvse died 

 Avithout pupating. Of the remaining 11, 6 had been 

 placed in tlie cylinders furnished with dark sticks ; 5 

 of these pupated on the dark sticks. In comparing 

 these summer pupae and putting each in its place in the 

 scale of colour, great assistance was derived from Mr. 

 Merrifield's descriptions made in 1898, when more of the 

 pupae were alive and those which were dead had changed 

 less extensively. 



All the pupae attached to dark sticks were clearly grey 

 forms (1), except one (probably dead), which was inter- 

 mediate between yellow-green and grey, having a bone- 

 coloured ground with many of the markings, especially 

 upon the wings, greenish instead of brown. Of the remain- 

 ing 4 pupa3, 1 had emerged in 1898, and was intermediate 

 between dark and light grey (2 a, h) or a lightish dark 

 grey (2 h) ; 1, still alive, was also a (2 a, h) ; 2, dead, were 

 certainly grey, and probably dao'k grey (2 h). 



The sixth pupa was dead and much discoloured, but from 

 Mr. Merrifield's description in 1898, it had evidently been 

 a yello'iv-grcen form (1 a) or (1 h) : '• The larva had 

 imperfectly attached itself to a dark stick and had then, 

 before pupating, fallen on the earth which, being moist, 

 was of a dark colour. It had there formed a yellow-green 

 pupa, somewhat misshapen." 



Of the 5 placed in light surroundings, 4 were attached 

 to shaved wliite sticks. 



Two were dead, but both were evidently yellow-green, 

 one probably a light and the other a dark form of this 

 degree, (1 a) and (1 li). 



Two had emerged, but both had been yellow-green and 

 one certainly a liqht form (1 a'), the other probably dark 

 (!&).•■ 



The fifth pupa, attached to the white muslin top, had 

 also emerged. This pupa was an exceptiiHi, being a distinct 

 light grey form (2 a). 



