﻿LÉPIDOPTÉROLOGIE COMPARÉE 293 



derablc depth of spacc, secmingly filled with clear fluid, which 

 looks, however, quite dark, by contrast with the whiteness of the 

 imaginai wings. 



Juiy 2jth. Eycs nearly black. 



////;' soth. Eyes and antennac nearly black, wings creamy 

 with a pink tone. 



]uly ^ist. Pupa very dark, nearly black ; underside of ab- 

 domen still brownish, wings shot blue with a black border. 



August ist. Pupa becoming whitish, first (early) at wing 

 bases, now (later) nearly ail over, due to absorption or evapo- 

 ration of fluid between the insect and the pupa case, the layer 

 of air admitted, giving a white appearance, modified a little by 

 the insect beneath. But the blue of wmgs is much less deânite 

 and obvious than it was yesterday morning when in wet contact 

 with the pupa case. 



August 2nd. A cf Lycaena alcon emerged this morning. 



The changes in the colouring of the pupa as the imago ma- 

 tures are much the same as in other Lycaenid pupae, but the 

 delicacy and transparency of the pupal skin are much greater 

 than in most other species, so that the changes are more defl- 

 nitely seen and especially the whiteness due to the entrance of 

 air between the insect and the pupal skm is only equalled in a 

 few Heterocera with délicate pupal cases. 



Some détails of the pupal skin are shown in Figures 15-20. 

 There are a good many small branched hairs; they are about 

 0.075 mm. long and divide into, usually, four diverging spicules 

 al- about half their length. They are shown m Fig. 20 ( x JOO). 

 They may be seen less magnilied in most of the other photo- 

 graphs. They occur ail over the pupa, except on the head and 

 appendages, and are most numerous near the spiracles. In 

 Fig. 15 showing the head cover, the photograph omits the dorsal 

 extension and dorsal head pièce, which are indicated in dia- 



