Plate XXTl. 



&&¥&& 





>y 



Photo. F. N. Clark, 



Comparative view of tip of the ancillary clasp in allied Plebeiid genera. 



1. Plebeius (argus) x 70. 2. Cyaniris (semiargus) x 140. 



3. Polyommatus (icarus) x 140. 4. Agriades (coridon) x 140. 



A Natural History of the British Butter Hies, etc., 1909. 



[To face p. 156.] 



