Erebia palarica and Erebia stygne. 29 



or none afterwards on the west and north faces of the 

 same mountains, and I saw remarkably few butterflies on 

 the west and north of the Picos." 



There are, as I have already noted, two Picos evicts in 

 the B. M. collection ; unfortunately they have only general- 

 ized labels, but one seems to be like the low-level forms, 

 the other approaches the high-level one. 



Going sixty miles further west to Pajares, we find stygne 

 less abundant, its habitat even restricted, but common 

 enough where it occurred. The three localities I most 

 closely examined were, first, the high-level one already 

 noted (over 6000 feet), I met with no other so high ; with 

 these a definitely high-level form of evicts. Second, at the 

 Puerto and extending for a mile along the north (Asturias) 

 side of the col, but not apparently reaching very far 

 either up or down from the 4500 feet level. The aspect 

 would be N. and N.W. The third locality was nearly two 

 miles below the col on the south side (Leon) at about 

 4250 feet, a comparatively small patch of a few hundred 

 acres, with a westerly aspect. 



We took specimens at a few other localities, but not in 

 circumstances to enable us to say what might be the 

 extent of the habitat, but generally these places had an 

 easterly aspect and were at about 4500 or 5000 feet. One 

 evias of doubtful high-level type not closely associated 

 with these. These stygne from Pajares make a certain 

 approach to the hispanica form, so that it is convenient to 

 call them so, but many individuals are little if at all 

 removed from the ordinary type. 



It would be interesting to know what forms occur 

 further west in the corner of Spain to the north of 

 Portugal and in Portugal itself, but for the present this is 

 a blank. The next point is at Canales to the south of the 

 Ebro. Here stygne and evias are both modified by way 

 of approach to each other, and fly together in about equal 

 numbers. Evias probably has a low-level form here. The 

 high-level one with stygne is of the form hispanica, but 

 only a few reach typical hispanica, others still retain 

 something of ordinary evicts. The stygne is less vari- 

 able than at Pajares, is two mm. larger and averages 

 larger than the associated evicts. Forty miles east of 

 this, at Moncayo, the same form of evias is found, but we 

 saw no stygne ; possibly it does not occur there, as stygne 

 seems to fail eastwardly, evicts towards the west. 



