POLYOMMATCJS (lYCJINA) ARGIOLUS. 97 



After the first moult, it became stouter in figure, pale 

 oclireous-green in colour, and clothed with unusually 

 long, whitish, soft, silky hairs, and was very sluggish, 

 no longer differing from larvse *of the spring brood. 



When about a fortnight old, it attains the length of 

 three-sixteenths of an inch, and becomes of the usual 

 Lyccena shape, with smooth glistening skin and with 

 the colour similar to that of the young iyy buds ; in 

 about three weeks it is five-sixteenths of an inch long 

 and stout in proportion, showing a paler streak on 

 the ridges of the back, thin double slanting lines on 

 the sides, and a margin of yellowish-white along the 

 sub-spiracular region. 



In about five weeks it is full fed, and then reaches 

 the length of three-eighths of an inch, and sometimes 

 more when stretched out in crawling ; the figure some- 

 what onisciform ; the head very small and retractile 

 into the second segment beneath ; the second segment, 

 which is the longest, is but slightly convex above, the 

 others are arched on the back, the third, fourth and 

 fifth being the highest, and thence the others slope a 

 very little to the tenth. These eight segments (from the 

 third to the tenth inclusive) are crested with two ridges 

 of humps, between which lies the sunk dorsal space, 

 broad and hollow on the third and fourth, and flattened 

 and narrowing gradually to the tenth ; on these seg- 

 ments the divisions are deeply cleft through the ridges, 

 thus producing the appearance of humps ; segments 

 eleven, twelve, and thirteen are simply convex, and 

 slope towards the anal end ; the sides although sloping 

 outwards, become almost concave near the projecting 

 rounded sub-spiracular ridge, which continues round 

 the anal segment, overlapping all the short prolegs. 

 The belly is flattened. 



In colour there seem to be several varieties ; one, a 

 bright yellowish- green, with paler lines as above, the 

 head purplish-brown, but looking almost black by con- 

 trast, and with an ochreous streak above the mouth 

 and at the base of the papillse, the spiracles round and 



vol. i. 7 



