300 Dr. Chapman on the Rein-sheath in Plebeiid Blues. 



specialisation otherwise of these blues described in my 

 paper, and is, of course, a detail of that specialisation. I 

 am not aware that any similar structure has heretofore 

 been observed. 



Explanation of Plates LXXV-LXXIX. 



Plate LXXV. Two specimens of A. bellargus (thetis), side view, 

 the prop and rein, clothed in the sheath, 

 extended. X 10. A. E. Tonge, photo. 



Plate LXXVI. Fig. 1. Sheath of one of the specimens in last plate. 



X 30. A. E. Tonge, photo. Mr. Tonge says 



that the blurring is due to passing traffic when 



photographing. 



Fig. 2. Rein sheath of A. coridon separated (it 



separates almost too easily), x 25. (Clark.) 



Plate LXXVII. Rein of P. icarus with sheath broken into 

 upper and lower halves. X 25, and lower 

 half of sheath. X 70. 



Plate LXXVIII. Portions of broken-up sheath of A. coridon. 

 X 35 and X 100. This illustrates how the 

 scales are intertwisted and the difficulty of 

 in any way separating out a single scale. 



Plate LXXIX. Rein-sheath of A. coridon, nearest approach to 

 separate (and unbroken) scales, x 200. 



