870 Mr. F. Merrifield luid Mr. E. P.. Poulton on 



tion, resemble the dark yellow-green (I h). The purplish- 

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

 sponding foi-ni (1 h), the dark dorsal band becoming a 

 specially prominent feature which contrasts strongly 

 with the appearance presented by the light (pry pupre 

 (2 a)._ 



1 will now apply the arrangement suggested above to 

 the results of Mr. Merrifield's experiment. The pupa were 

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

 without pupating. Of the remaining 11, 6 had beeu 

 placed in the cylinders furnished with dark sticks ; 5 

 of these pupated on the dark sticks. In comparing 

 these summer pupa3 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 

 pupje were alive and those which were dead had changed 

 less extensively. 



All the pupa^ attached to dark sticks were clearly g)-ey 

 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 pupoe, 1 had emerged in 1898, and was intermediate 

 betw^een darh 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 dark grey (2 h). 



The sixth pupa was dead and much discoloured, but from 

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

 a yellow-green, form (1 a) or (1 /)) : '^ 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 white 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 h). 



Two had emei-ged, but both had been yellaw-green and 

 one certainlv a light form (1 et), the other probably dark 

 (1 h). 



The fiftii pupa, attached to the Avhite muslin top, had 

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

 light grey form (2 a). 



