the full groivn larva of Lycaena eupJiemus. 329 



black mark and figure the larva as without it, though 

 this was contrary, apparently, if not really, to his principle 

 of never drawing anything that he did not actually see. 



The larva is given to " hunching," i. e. contracting and 

 thickening, so that being about 15 mm. when extended, 

 at rest it is often only 12 mm. and nearly 5 mm. in diameter 

 especially in the abdominal segments, which are thickest at 

 all times, but especially when " hunched." 



The colour is now very pale, so that it is difficult to 

 say that it is really pink, such colour as there is being 

 really due to the now well-separated, stellate points or 

 bases of abortive hairs (many being probably lenticles) 

 well seen in photograph of skins of larvae in Trans. Ent. 

 Soc, 1919. These prevent the larva having the appearance 

 of a very deHcate skin, showing fat bodies, etc., as in 

 L. alcon; but the conspicuousness of the dorsal vessels 

 and its pulsations suggest that the delicacy and trans- 

 parency of the skin is essentially as in L. alcon. The 

 subdorsal eminences on 2nd, 3rd, 4th, 5th, and 6th abdo- 

 minal segments are less marked than in the hibernating 

 stage, owing to the general enlargement and stretching 

 of the skin, the transverse section being now nearly circular 

 instead of (seen dorsally) with a dorsal flatness apart from 

 the eminences. The most notable change in the pro- 

 portions of the larva is, that the first abdominal segment, 

 instead of being small and weak, is much like the others, 

 though with a Mttle imagination it may be held to look 

 just appreciably narrower. Here and there are stumps of 

 the long hairs that the ants bit off in the early autumn 

 days. 



June 19th. — The larva has stationed itself at the top 

 of the side of the nest. It was supposed to be not quite 

 full grown, but it may be so and resting for pupation. 

 The black mark on abl. 7 makes one not too hopeful of 

 this being successfully accomphshed. 



June 20th. — In same position ; no enlargement of thoracic 

 segments. 



June 21st. — Thoracic segments distinctly swollen. The 

 larva was resting horizontally on the side of the nest near 

 the top, and the ants have been more about it than normally ; 

 since yesterday they have put black material about the 

 spiracular regions of the upperside. This would not wash 

 off with water — another handicap to its due pupation. 



June 22nd. — L. eujphemus is found this morning to have 



