18 LAUGE WHITE. 



under two inches across. The upper surface of all the wings is white, 

 the fore ones having a broad black patch following the angle of the 

 outside corner, and indented on its lower inner edge. There is a pale 

 blackish grey margin at the front of the wings, extending nearly to 

 the patch at the corner; and the whole front edge has a line of black 

 along it. Occasionally, but very rarely, the males have a black spot 

 on the fore wings; the hind wings have a black spot on the middle 

 of their front edge. Underneath, there are two black spots on the fore 

 wings, which however are independent of any generally apparent 

 corresponding markings on the upper side. The hind wings are dull 

 yellow, minutely dotted all over with black specks. There is only a 

 faint trace of the black mark on the middle of the front edge. 



The female has the outside patch larger than in the male, with its 

 inner edge more or less deeply indented. There are also two large 

 irregular round black spots on the middle of the fore wings, and 

 immediately beneath them a streak of the same running along the 

 lower edge of the wing, and attenuating towards the body. The hind 

 wings have a triangular-shaped spot on their front side in a line with 

 the spots on the fore wings. Underneath, the fore wings shew the 

 black spots plainly through, and the black patch very faintly. The 

 hind wings are of a dull greenish colour, dotted all over with very 

 minute black spots, and shewing the black triangular patch rather 

 obscurely through. 



The eggs are deposited in clusters. 



The caterpillar is greenish yellow, the segments being almost covered 

 with black tubercles of different sizes, from each side of which arise 

 white hairs, three of the larger ones forming a triangle. The head, 

 fore legs, and hind segment are also black. There is a line of green 

 down each side, and one along the back. 



The chrysalis is pale green, spotted with black, and with three 

 yellow lines. 



Varieties occur both in size and markings. A very remarkable one, 

 figured in the "Zoologist," page 471, is given in the plate. It was 

 taken in a garden in Leicester, in the year 1843. 



Some have imagined a separate species under the name of 'Pontia 

 Chariclea.' 



The engravings are from specimens in my own collection; one of 

 them the unusually small one before referred to. 



