50 HEATH BUTTERFLY. 



permanent varieties seeming, as in the case of some other species, 

 to belong to particular localities. 



One described under the name of 'Polydama,' measures about 

 an inch and a half in the extent of its wings; the fore wings 

 arc of a yellow broAvn colour, with two obscure eyes. The 

 hind wings arc brown, but with the inner edge broadly 

 marked with dull white or pale buff, and there is a small 

 obscure eyelet near the hind angle. 



Another, described by the specific name of 'Typhon,' of the 

 same size as the previous named ones, is described as follows: 

 — On the upper side the wings are of a rusty grey or ochre- 

 colour; brown at the base. The hind wings arc generally 

 darker, and without any distinct eyes. Underneath, the fore 

 wings are dusky at the base, followed by an irregular whitish 

 stripe, and the outer part greenish ash-colour, with from two 

 to five small eyes, occasionally obsolete. The hind wings are 

 greenish brown at the base, with an irregular interrupted bar, 

 (this interruption forming the ground of the formerly supposed 

 specific difference,) beyond the middle of the wing, and generally 

 with about six small eyes, but their number is very variable; 

 tliis bar is followed by a shade of greenish brown. 



The female has the wings paler, and more tinged with ochre, 

 with a large pale blot on each. The bar is succeeded by an 

 ochre shade. 



Mr. Westwood remarks on these different varieties, or supposed 

 species, that in Davus all the markings are complete, distinct, 

 and unclouded; in Polydama they are somewhat paler and less 

 defined; and in Typhon the broad band is divided into two 

 irregular marks, while in farther varieties some of the marks 

 disappear altogether, and all are fainter. Also that Davus has 

 the little rings always more or less defined on the upper side, 

 and is of a dull brown colour with a slight inclination to grey, 

 the darker parts inclining to olive green. Typhon and Polydama 

 have the little rings very slight, and in some instances altogether 

 wanting on the upper side, while also the ground colour is 

 somewhat paler, and inclining to tawny, and on the under side 

 all the markhigs are paler and less distinct. 



