Eastern Pier idee. 331 



across the end of the cell purple-black, and a submarginal row of 

 white spots ; the hind wings as above described. 



b. Aspasia group. 

 6. Pierls offinis, Vollenhoven. 

 Pieris affinis, Voll, Mon. Pier. p. 40, pi. 5, fig. 2, $ . 

 Hab.— Macassar (Wall.); N. Celebes (Voll.). 



This insect bears such a curious resemblance to P. ithome ? , that 

 it has been always considered to be the female of a closely-allied 

 species. Owing to its having very small and smooth anal valves 

 I had always considered it to be of that sex ; but having heard 

 that Mr. Watson had found plumules on the wing, and therefore 

 pronounced it to be a male, I relaxed my specimens, and by 

 opening the valves found that he was right, and that all the spe- 

 cimens in my own and other collections are males. This being 

 the case it is evident that it has no close offinitTj whatever with P. 

 ithome, or with any other known butterfly, so that its name will be 

 a good example of " lucus a non lucendo," and will serve to recall 

 the error to which its analogical resemblance to P. ithome $ gave 

 rise. It must now come in the group of true Pieris, and is nearest 

 to P. rachel, Bd., though forming a distinct subsection. 



7. Pieris Boisduvaliana, Felder. 



Pieris Boisduvaliana, Feld. Wien. Ent. Monats. vi. p. 287 ; Voy. 

 Novara, pi. xxiv. fig. 8, $. 



Hab. — Luzon, Philippines ( ^ , ? , Wall. Coll.). 



Evidently allied to P. rachel, but very distinct; and it is 

 particularly interesting as showing an approach to the curious 

 P. affinis, which it serves to connect with this group, 



8. Pieris rachel, Boisduval. 



Pieris rachel, Bd. Sp. Gen. p. 469, ^ . 



P. IVallaceana, Feld. Voy. Novara, p. 168, ? . 



Hab.— \Na\g\oxx (Wall.); Tidore, Ceram (Voll.); Bouru (Wall.). 



These specimens agree exactly with Boisduval's description, 

 excepting only the absence of the small yellow spot on the under 

 surface of the lower wings near the outer angle, of which a trace 

 is found only in some Bouru specimens. He gives "Java" as the 



