INSECTS IN THEIR PERFECT STATE. 143 



wings of the male, and on the other the dusky 

 brown ones of the female. This curious mon- 

 strosity is not very infrequent. I once had a 

 specimen myself, and have seen several in the col- 

 lection in the British Museum, and elsewhere. The 

 appearance, however, is so singular, that I had 

 great trouble in getting the drawing cut by the 

 wood-engraver as I had drawn it, the block having 

 been sent back to me when half engraved, with a 

 note stating that I had forgotten to finish one pair 

 of wings of the small Butterfly No. 6. 



A similar misapprehension occurred in an Article 

 on this family of Butterflies which I contributed to 

 the " National Magazine," illustrated with a draw- 

 ing of this curious lusus naturce. The engraver 

 was, in that instance, so convinced of a mistake, 

 that without troubling me on the subject, he ac- 

 tually set one of his draughtsmen to make both 

 the wings match, and it was so printed, before I 

 discovered the extraordinary correction to which my 

 work had been subjected. 



The Caterpillar of this species, which is one of 

 the onisciform or Wood Louse-shaped kind, is re- 

 presented at No. 7, and the little chrysalis at 

 No. 8 in the same Plate. 



It may be observed here that the male Poly- 



