Explanation of Plate X. 



Illustrating Dr. T. A. Cliapman's exhibits, etc., referred to iu the 

 Proceedings, pp. xxiii — xxv. 



Fig. 1. Pupal wing-case of Aporia cratsegi. The hollow at apex is 

 the result of an accidental fracture, a portion being lost. 



2. Wing of imago, removed from beneath 1. Being semifluid 



it is enlarged and distorted (both photos are to same 

 scale). The pale markings here correspond to dark parts 

 of 1. There is really no difference in colour, but the 

 parts beneath the black of the pupa are more delicate 

 and transparent. 



3. Porthetria dispar, third pair of larval legs, the left one 



damaged at last larval moult. 



4. Porthetria dispar, legs of imago corresponding to 3. 



