Plate XXIII. 



(To be bound facing Plate XXIII.) 



Skin of larva of Celastrina argiolus (first instar) x 80. 



Skin prepared by slitting the larva along the ventral line (as well as my rough 

 technique can manage so delicate an operation) removing the interior and spread- 

 ing out the skin as well as may be and mounting in balsam. The whole skin is 

 very transparent, and the photograph, from which the plate is made, was touched 

 up, to make certain hairs appear in this reproduction. These hairs are the pair 

 immediately above the spiracle (iii), and the comparative coarseness of the result 

 is easily detected in the plate, no attempt is made to bring out more clearly any 

 other features. The plate may be compared with detailed description (p. 435). 

 Down the centre is seen the prothoracic plate and the large hairs (i) of the dorsal 

 crest, behind these those of ii, and then two lenticles (just like spiracles), one 

 above the other, then the hairs (iii), reinforced as noted above, and then the 

 spiracles, below each of these the three hairs of the lateral flange (iv, v) ; just 

 below these the margin of the upper surface of the larva. The ventral portion 

 comes out so poorly in the plate that it may be neglected, though traces of legs and 

 prolegs are visible. The skin-points come out well enough to give a good idea of 

 their number and distribution, so difficult to give in any description. 



