Phyktic Parallelism in Metamorphic Species. 423 



This is the same marking as is shown by the 

 fourth stage of the German form, only in this case 

 individuals quite destitute of black do not occur. 

 In many specimens indeed black forms the ground 

 colour, the green only appearing in certain spots 

 (Figs. 71 to 75) ; in others the green predominates, 

 and these two extremes are connected by innu- 

 merable intermediate forms, so that this stage 

 must be regarded as the most variable of all. 



The sixth stage of the Genoese and the fifth of 

 the German form have already been compared 

 together. The results may be thus tabulated : 



A. German form. 



STAGE I. 9 days. 

 Black ; constant. 

 STAGE II. 8 days. 



Black, with orange-yellow 



lateral stripe ; variable. 

 STAGE III. 5 days (in some 

 cases as much as 16 days). 

 Black, with yellow ; very 



variable. 



STAGE IV. 16 days (in some 

 cases only 5 days). 

 Bright green and black, 



mixed ; very variable. 

 STAGE V. 6 days (frequently 

 longer). 

 Dark green, with or without 



black bands ; variable. 

 STAGE VI. Pupation. 



B. Genoese form. 

 9 days. 



Black ; constant. 



1 1 days. 



Black ; constant 



1 2 days. 



Black, with orange-yellow 

 lateral stripes; constant. 

 6 days. 



Black, with bright yellowish 



lateral stripe; constant. 

 6 days. . 



Bright green, small traces 

 of black ; variable. 

 1 8 days. 



Bright green, without any 



black ; constant. 

 STAGE VI I. I'uputiun. 



