67 



Sphingidial and Rhopaloeeran pupae, is the connection between the 

 markings on the pupae of the Sphinges and on their caterpillars 

 and imagines respectively. Among the material at my dis[)osal 1 

 found this similarity most distinctly mai'ked in Deilephila celerio, 

 as far as general completeness goes, ihough for certain details or on 

 special parts of the body, other related forms sometimes showed 

 the similarity still better and more complete, or in a more original 

 form, as 1 ho|)e to point out in a following communication. 



Though I still lacked the occasion to extend my investigations to 

 living caterpillars in their different instars, or to the development 

 of the pupal skin beneath the last larval coat, or the imaginal 

 epidermis inside the pupa, I do not doubt a moment but these 

 transgressive stages will strengthen my conclusions as to the com|)ara- 

 bility of larval, nymphal aud imaginal colour-design, viz. that all 

 three are simply moditications of one and the same ground-plan, 

 which manifests itself clearest in the pupa. 



Groningen, April J 918. 



5* 



