PIERIS DAPLIDICE. 55 



might, however, be easily mistaken, and probably some- 

 times is, for either one of the smaller Whites or the 

 female Orange-Tip, which last it closely resembles in its 

 markings. 



The eggs of this much-coveted butterfly will be found 

 if anywhere on one of the two species of Mignonette 

 indigenous to Britain (Reseda lutea and R. luteold), and 

 possibly on Flixweed (Sisynibrium Sophia) and other 

 cruciferous plants. They are laid about the beginning 

 of May for the first brood, and again in August or 

 September. The larvae therefore would be found in 

 May and June, and also in September ; the pupae about 

 July, and also from September till April; while the 

 imago should be on the wing almost any time from April 

 or May till September with the other Whites, the winter 

 being passed of course in the chrysalis state. 



The larva (Fig. 40). which is from lin. to i^in. in 

 length, is of a pale bluish colour, with four yellow 

 stripes, two being dorsal and two lateral, one of the 

 latter along each of the spiracular regions ; the ventral 

 surface is somewhat greenish. The caterpillar is covered 

 with black warts and dots of various sizes, from which 

 proceed black hairs ; the segments, which are fairly distinct, 

 are subdivided into six sections. 



The pupa (Fig. 41) is greyish, marked with black spots, 

 and having a couple of dark streaks on the wing-cases. 

 It is rather robust and somewhat prominently keeled. 



All the wings of the imago (Figs. 37 to 39) are 

 simple, the tip of the fore-wings is rather blunt and the 

 costal margin very slightly concave, the hind-margin of 

 the hind-wings is straight. The ground-colour is white, 

 with a very slight tinge of cream ; on the upper surface 

 the fore-wings are tipped with a broad blackish patch 

 containing four white spots, and between this patch and 



