( xxxvi ) 



:ill wiugs. And their horse-shoe form on the hind wings is 

 often completed into a circle by a white or bluish line. In 

 some specimens they are reduced to one or two on the hind 

 wing only. The blue of hind wing of S is often restricted as 

 in ty[)ical anjus, but oftener advances up to vein 7. The var. 

 hypochiona is perha})s the nearest to this form. It goes a 

 good way to bridging over the differences between argus, 

 lyculas and zeph>ji'us, iuid in some degree argyrognomoii, 

 {argus, Esp.) also. It resembles the latter in the extension of 

 the blue of the hind wing of the c? and in the completed ocelli 

 of the 9 hind wing ; but the colour of the underside and of the 

 fringes of the ? are characteristic of argues, apai-t from the wide 

 border and other obvious characters. The other butterfly is 

 a form of Erehia stygne. This differs from the type chiefly 

 in size, having an expanse of 51 m.m. S and 55 m.m. 9 > 

 comparable witli rather large specimens (exhibited) from the 

 Alps measuring 44 $ and 45 ? , and the measurements given 

 by Buhl 38-42 m.m., Kane 1-25-1-60 in. = 31-40 m.m., 

 Lang l-20-l'60 in. = 30-40 m.m. They are characterised by 

 having the "rusty band" very large, bright and well defined. 

 The males usually have four, often five spots on upper wing;^, 

 and the females almost always five pupilled spots, but occa- 

 sionally with a sixtli. The underside of the hind wing of the 

 males is very deep black, and of both sexes the ground colour 

 is l)lack, and the broad rusty band extends a good deal nearer 

 the ])ase than in typical stijgne. Stygne is a wide-spread 

 species, but I do not know that it has previously been 

 recorded from Spain. The var. pyrexia ica seems to hail from 

 the French slope of" the Pyrenees, and is a variety with the 

 rusty bands and eyespots reduced, instead of increased as 

 in the form before us. I propose to name this form var. 

 bejarensis from its habitat, the Sierra de Bejar, where it flies 

 on a slope amidst Cytistis 2)ergans, at a height of about 5000 

 to 5500 feet, during the fii'st half of July. This might easily 

 have been described as a distinct species, in the good old 

 times, when the wing markings so protean in this genus were 

 relied on. The less variable S appendages, however, show it 

 to be really stygne. Staudinger's last edition by the way still 

 sticks to these good old ideas and makes le/ebvrei a var. of 



