268 T.EPIDOPTERA. 



is !t sloiuliT ohscui'i' transverse dark brown line. l)linitly and 

 sfjiiarely iuiii'iilated in tlie middle: beyond it sometimes an 

 even more obscure sniokv transverse band, broken by 

 wliitisli (.•liiiids near tlie hind niaru'i". wliicli is edited by a 

 slendei' brown line: cilia pale brown. Female usually lartjer, 

 and with the body .stouter, but very similar. 



Underside of the fore wint^s pale smoky -brown to the 

 second line, which is conspicuously reproduced, but even 

 and sijuan-ly anLCulated ; outside it the surface is broadly 

 stri|)ed witii pale ochrecuis : a stri|) "f the same colour runs 

 alonL? the cost a. and a browner shadiiii;' aloUL' the hind 

 margin. Hind wind's ]iale yellow, dusted with brown ; cen- 

 tral s]iot brown : the central anyulated smoky-brown line 

 more distinct and r.'ither indented : alouL;- the hind margin is 

 a cloudy brown shade. liody and legs yellowish-brown. 



N'ariable, as above shown, in a remarkable degree: indeed 

 it is hardly practicaiile to give more than an outline of its 

 various forms, some of them of general occurrence, others 

 forming local races. In the branch of ordinarj- variation in 

 which the central portion of the fore wings is white, this 

 often extends outside the second line, when this line, and a 

 duplicate inside it, and often a parallel dn]jlieate of the first, 

 become lufist delicately and gracefully visible as slender 

 o-rey threads, angulated and lociped ; when the white is 

 nune'led with brown they become clouded and shaded; as 

 the bri)wn becomes intensitied they are obscured, and dis- 

 appear in the ilark brown and black-banded forms: also 

 usually in those which are fawn-colour or ochreous brown. 

 Much the same may be said with regard to a I'icli shading of 

 tawny-yellow or red-brown which is conspicuous outside the 

 central band in those forms in which the band contains any 

 white, but becomes obscured or disappears in the darker 

 varieties, or in some of the black-banded is greatly restricted, 

 and sometimes replaced by rijjpled lines of white. In a very 

 line series of forms, doui)tless a local race, found on the 

 higher parts of the hills of the Isle of Arran, the fore wings 



