Explanation of Plates. 35 



Plate IV. 



As a Plate this is open to criticism, but it shows what it is desired 

 to do. Figs. 1 and 2 are E. stygne, and 3 and 4 E. evias, taken 

 by Mrs. Nicholl at the Pi cos de Europa in 1902. The two species 

 show some little approach to each other, but one at least of the 

 evias is clearly the ordinary form, and these and other specimens 

 leave it doubtful whether E. evias has here made any recognizable 

 progress into the division into a large, bright, low-level, early 

 form (evias) and a small, pale, high-level, late form (hispanica). 

 Figs. 5 and 6 are Professor Poulton's two specimens, one evias, 

 one stygne, from Pehalara. The evias (var. penalarx) is clearly a 

 high-level form, but specially varied to agree with the stygne (var. 

 penalar&) rather than quite like var. hispanica. 



Plate V. 



Sketch map of the northern half of Spain, showing habitats of Erebia 

 palarica and of E. stygne and evias and their varieties. The lines 

 connecting the stations for evias and stygne mark the progressive 

 variation of E. stygne to successively vars. hispanica (Canales), 

 penalarse (Pehalara) and bejarensis (Bejar), and of evias to vars. 

 hispanica (Canales and Albarracin) and penalarse (Pehalara). 

 Low-level (type) evias is more widespread (as the others probably 

 are also) than is indicated on the map. 



Plate VI.. 



Fig. 1. Eggs of Erebia palarica, x 10. 



2. „ „ stygne (Puerto de Pajares) x 10, both from 

 photographs by A. E. Tonge, Esq. 



3. Clasp of E. palarica x 24. 



4. ,, E. stygne x 24. 



