174 Explanation of Plates. 



beyond the zone, but with oblique 

 opening reaching down to that point, 

 and in the case of PL eversmanni the 

 preparation happens to show a con- 

 siderable exsertion of the eversible 

 membrane; this accident is very rare 

 in preparations of Plebeiid appendages. 

 These figures and those on the two 

 following and other plates illustrate 

 the large area between the aedeagus 

 and clasps, as referred to under PL 

 XXVI. 



Plate XXVIII. Fig. 1. Aedeagus of PI. aegon, X 40. 



Fig. 2. Aedeagus of PL argyrognomon, X 40. 



Fig. 3. Aedeagus with dorsal armature, etc., 

 of PL argyrognomon, X 45. These 

 demonstrate the oblique opening of 

 the aedeagus beginning at the zone, 

 and that this external portion is less 

 chitinised than the inner piece, and is 

 of pointed dagger form. 



Plate XXIX. Fig. 1. Aedeagus of Aricia idas, X 40. 



Fig. 2. Aedeagus of Albulina pheretes, X 40. 



Fig. 3. Aedeagus of Aricia medon, x 40. 



Fig. 4. Appendages of Aricia donzelii, X 20. 

 These show the long slender, pointed 

 end of the aedeagus, with oblique 

 opening beginning at the zone ; in 

 Aricia and Albulina the genitalia do 

 not support generic differentiation from 

 Plebeius. 



Plate XXX. Fig. 1. Male appendages (except clasps) of P 

 icarus, x 30. 



Fig. 2. Aedeagus of P. eros, X 40. 



Fig. 3. Aedeagus of A. coridon, X 40. 



Fig. 4. Aedeagus of Aricia isaurica, X 40. In 

 Fig. 3 there is some eversion of the 

 eversible membrane. Fig. 4, isaurica, is 

 not a typical Aricia, a group to which it 

 appears otherwise to belong. 



