Plate XXI. 



Photo. F. N. Clark. 

 Comparative view of dorsal portion of ancillary appendages of Plebeiid genera. 



1. PLEBEIUS (ARGUS). 2. CYANIRIS (SEMIARGUS). 3. PoLYOMMATUS (iCARUS). 



4. Agriades (thetis) (all x 35). 

 A Natural History of the British Butterflies, etc., 1909. [To face p. 156.] 



