94 LÉPIDOPTÉROLOGIE COMPARÉE 



guishing marks are to be found in the colour and ocellation of 

 the under-side of the hind wings. " 



And briefly his conclusions are : — 



1. Northern Form : 



Upper sïde : colour varying, but usually a ferruginous tint; the 

 female always of a pamphiliis tint; ocellation obscure. 

 Under side : ocellation obsolescent, or absent altogether. 



2. Middle Form : 



Upper side : colour varying from tint almost as dark as Form 3 

 to that of pamphilus. Ocellation : spots, small and surrounded 

 by an ochreous, not a fulvous ring. 



Under side : basai area greenish to ashy; hirsute, five distinct 

 but small ocellated spots, with pale ochreous rings. 



3. Southern Form : 



Upper side : colour dark brown ; females only slightly paler. 

 Ocellated spots well marked, and surrounded with fulvous ring. 



Under side : uniform brown tint, transverse band well deve- 

 loped, and black constituent of ocellated spots large. 



DISTRIBUTION 



I. NORTHERN FORM 



A) Cœnonympha tiphon, Rott., in Scotland and the Isles. 

 Var. laidion, Bkh. 



In the characteristic laidion the tendency of coloration on the 

 upper side of the wings is from pale ochreous to whitish; in some 

 extrême examples the hoary marginal white invading the greater 

 part of the wing area. Often, also, the wings are devoid of ocel- 



