158 THE BUTTERFLY VIVARIUM. 



neath, and of a soft velvety green above, with a 

 narrow yellow stripe down the centre of the back, 

 and no black markings whatever. It is more 

 injurious to cabbages than even the Caterpillar of 

 F. Brassicce, as it feeds upon the young internal 

 leaves of the heart, and has been thence termed by 

 the French the Ver du coeur. 



There is a variety of this species, by some called 

 Fieris Metra, which is smaller still, and having the 

 white of the upper side more dusky, and the buff on 

 the underside of the hind-wings very much deeper 

 in colour ; indeed, almost brown. In other respects, 

 with exception of a supposed greater degree of slen- 

 derness in the form of the wings, it does not differ 

 in appearance from Fieris Rapce. The Caterpillar 

 has not yet been observed. 



Another species, Fieris Napi, is still more dis- 

 tinct than F. Fapce, its popular name, the " Green- 

 veined White," indicating one of its main distinc- 

 tions from either of the preceding species ; with 

 this very remarkable difference, it very closely re- 

 sembles F. Fapce, but the beautiful bright green 

 mottlings, on either side of each of the veins on the 

 under surface of the hind-wings, forms an all-suffi- 

 cient distinction. The Caterpillar may be distin- 

 guished from that of F. Fapce, which it closely 



