194 ' THE BOOK OF BRITISH BUTTERFLIES. 



brood are full-fed in the spring, and produce the earlier 

 flight of butterflies. 



The larva, which, when fully grown, is about fin. in 

 length, is of the usual Lyc&na shape, with a double 

 series of dorsal humps on segments three to ten. The 

 colour is deep green. The dorsal humps all bear a 

 yellow dash, and the succession of dashes forms on each 

 side an interrupted dorsal yellow line, while a line of 

 the same colour near the edge of the lateral dilatation 

 surrounds the caterpillar, except near the anterior 

 extremity. There is besides a row of yellow dashes 

 below the spiracular dilatation and above the feet. The 

 spiracles are black, and the head is very nearly so. 

 There is, according to Mr. W. Buckler, very little 

 difference between the larva of this butterfly, Z. bellargus, 

 and that of L. corydon except that in the latter the 

 ground-colour is a yellower green, and the hairs are 

 light brown instead of black. The larvae seem to like to 

 bury themselves just below the surface of the ground, 

 where they form a rudimentary cocoon before taking the 

 pupa state. 



The pupa is without points or angles. The wing-cases 

 are long, and they and the thorax are somewhat shining, 

 but the abdomen has a roughened appearance ; the 

 surface is slightly hairy. At first the wing-cases are 

 greenish, while the rest of the body is of a browner 

 green ; afterwards the whole body takes on a brownish- 

 yellow tinge. 



The costal and hind margins of the fore-wings of the 

 imago (Figs. 219 to 221) are slightly convex. All the 

 wings are entire, and the fringe is white, with dark marks 

 at the nervures. The upper surface of the male (Fig. 220) 

 is bright sky-blue, with a fine black line separating that 

 colour from the fringe. Close to this line on the hind- 



