HEATH BUTTERFLY. 47 



side the wings are of a rusty grey or ochre-colour, brown at the base. 

 The hind wings are 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; this 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 further 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 markings are paler and less distinct. 



The figures are from specimens in my own collection. 



