Pity let tc /'<j/-if//7/vw in Mttamorfihic Species. 425 



green but the lateral (infra-spiracular) line which 

 was yellow in the preceding stage, and a crescent- 

 shaped streak at the base of the middle warts 

 together with a still smaller crescent at the base of 

 the upper warts (Figs. 71 and 81). These spots 

 become extended in lighter specimens and ap- 

 proximate so as to leave only narrow black bridges, 

 a third spot being added at the posterior edge of 

 the warts (Figs. 72 and 82). The three spots then 

 extend on all sides, still leaving for a long period 

 narrow black lines at the boundaries where their 

 growth has caused them to abut. In this manner 

 there frequently arises on the green ground a true 

 hieroglyphic-like marking (Figs. 85 and 86). 

 Finally the black disappears from the anterior 

 edge and diminishes on the middle line of the 

 back where it still partly remains as a T-shaped 

 figure (Figs. 73 and 74), although generally 

 replaced elsewhere by the green with the excep- 

 tion of small residues. 



One point remained for a long time inexplicable 

 to me, viz., the change of the light green into dark 

 grey-green which appeared in the last stage in 

 connection with a total change of the black mark- 

 ing. 



Supposing that new characters are actually 

 acquired only in the last stage, and that from this 

 they are transferred to the younger stages, we 

 should expect to find completely developed in the 

 last stage the same colouring and markings as 



