1G0 THE BUTTERFLY VIVARIUM. 



the broad orange mark at the points of the fore- 

 wings, might be mistaken for the male of Pieris 

 Napi. But then the form of the wings is much 

 rounder, and the green mottling of the under sur- 

 face of the hind-wings is much more scattered over 

 the whole wing, and not confined to the edges of the 

 veins, as in P. Napi ; while in the male the beautiful 

 orange mark is an all-sufficient distinction. Then 

 there is the pretty little "Wood White," Leptoria 

 Candida ; much smaller than any other of our White 

 Butterflies, and with much narrower though more 

 rounded wings. It is of a soft creamy white both 

 on the upper and under surface, except at the tips 

 of the anterior wings, which are ornamented with 

 a soft roundish blotch of deep blackish-brown, quite 

 different in form to the similarly-situated markings 

 in the genus Pieris, the blotch being rounded con- 

 vexly towards the body, while those of all the 

 species of Pieris are concave in their internal out- 

 line. 



There is yet another kind of White Butterfly, 

 which, like the last two, is also of a distinct genus, 

 though so similar in general aspect, till closely 

 examined. It is a rare insect in this country, known 

 as the Black-veined White (Aporia Cratcegi). It 

 may be easily distinguished by the semi-transparent 



