( xlvi ) 



Zapater says nothing of stt/gne, which was not reported 

 from Spain, till taken last year by Mrs. Nicholls and by us. 

 We did not see evicts last year when taking stygne, var. 

 hejarensis. So that the association of the species in Spain is 

 far from universal. I may remark, by the way, that the 

 ground where hejarensis was found was very different from 

 that affording the species this year. Nevertheless, it seems 

 highly probable that this association has something to do with 

 Spanish evias being small and stygne larger. 



The homceochromatism here consists in these two Erebias, 

 so very distinct in their ordinary habitats and belonging to 

 different sections of the genus, when they occur in Spain on 

 the same ground, doing so at the same time, and making a 

 considerable approach to each other in markings and an almost 

 absolute coincidence in size. I have placed with them some 

 hejarensis for comparison. It will be noticed that it goes 

 much beyond the Canales form in the direction in which that 

 has varied. Looking at the under-sides, one would say the 

 9 hejarensis were forms of evias and not of stygne. Might 

 one suggest that, in Spaiu, evias attracted stygne and led to 

 its variation to the form before us, and by this assistance 

 enabled it to get over the intermediate ground, and to pass 

 on when dissociated again from evias to the hejarensis form ? 



I note some specimens of evias vary very much towards the 

 form, size, and colour of E. zapateri. There is no evidence 

 know^n to me of these species ever being associated (zapateri 

 is much later than evias), so that this resemblance must be 

 one entirely due to climate and locality. 



Erehia stygne in Spain will obviously repay more study ; 

 there is the curious problem of the large (high level) 

 and small (low level) forms taken last year at approximately 

 the same dates, and in adjacent localities near the Picos de 

 Europa by Mrs. Nicholls. Has association with E. evias 

 anything to do with this as yet unexplained phenomenon 1 



I propose that the present form of E. stygne be called var., 

 or at least local form, hispanica, as parallel to E. evias, var. 

 Mspanica, It is rather darker and more strongly marked 

 than the type, and has an average expanse of 48 mm., ranging 

 from 45 mm. to 51 mm. 



