het'ween lepidopterous larvee and their surroundings. 353 



colour. The two others were uot so dark and bore brown 

 points and patches, which tended to fuse at their edges 

 with the dark greyish ground-colour. 



J. The three similar larvm vnth hlack tivigs. — Only one 

 larva was alive, and this was rather darker than the darkest 

 of the set just described (I), having a dull blackish ground- 

 colour. One dead larva had a very black ground-colour 

 with brown dorsal points and distinct although small white 

 patches. It is probable that some slight effect was 

 produced by the black twigs just before hybernation 

 began. 



K. The four lightest and most distinctly sjiotted larvae, 

 ivith hro^on twigs. — Three larvae were alive. The smallest 

 one possessed the blackest ground-colour and the whitest 

 patches of any in the whole series (III). The other two 

 closely resembled the two lighter larvae in I. 



IV. THE QUERCIFOLIA LARV^ UPON GREEN LEAVES AND 

 SHOOTS OF THE HAWTHORN. 



L, M. There was no distinction between the two lots. 

 The larvae, as before hybernation, presented a great range 

 of variation, but the ground-colour was upon the whole 

 greyish. The lightest individual was rather lighter than 

 the darkest of those upon lichen before hybernation (II), 

 while the next in order was about the same as the darkest 

 of II. Four others were rather less light, while a fifth was 

 a distinctly dark form. Hence the set was upon the 

 whole intermediate between I and II and distinctly 

 lighter than III. 



April 2Hth. The length of all those larvae which had 

 ceased to feed preparatory to a change of skin was about 

 56*0 mm. A few days later the cast skins were examined, 

 and were seen to possess the white markings as well as the 

 dark ground-colour. Hence these characters are in part, 

 if not entirely, cuticular in position. 



Third General Comparison of the LARv.t: made 

 AFTER Hybernation, May 7th. 



I. the QUERCIFOLIA LARV.E WITH BLACK TWIGS BEFORE 

 HYBERNATION. 



A. The 3 chequered larvx with Mack twigs. — Two larvae 

 were dark, and 1 black chequered with white markings, 

 which were larger than those of any other larvae in I, but 



