CNEPHA SID.S—A BLA lUA . 253 



Underside of the fore wings dark smoky brown, with a 

 paler hind margin. Hind wings smoky yellowish-white. 



^'ariable in shades of colour of the fore wings, and in the 

 presence or absence of markings ; in the Shetland Isles the 

 colour of the fore wings varies through every shade of brown 

 and red-brown to black. 



On the wing in Juh' and August, and, in the far north, 

 even in September. 



Larva uudescribed and not certainly known. The few 

 hints given as to its habits by authors do not agree, but 

 there is little doubt that it feeds on low-growing plants, or 

 grass. 



Abundant on chalk hills, pastures, and in the north on 

 mountains : even to be found in the suburbs of London, and 

 fairly common in grassy places throughout the British Isles 

 to Shetland. Abroad it is widely distributed through 

 Central and Northern Europe, North Italj-, the mountains 

 of Dalmatia, South-east Russia, North-east Siberia, Iceland 

 and Lapland, and in North America, in Labrador. 



2. A. argentana, C/mrl- ; gouana, Gn. — Expanse 

 1 inch (25 mm.). Fore wings shining silvery white, without 

 markings. 



Antenna* notched, light brown, the notches whiter; palpi 

 dirty white ; head and thorax silvery-white ; abdomen 

 yellowish-white. Fore wings long, rather narrow ; apex 

 bluntly pointed, the median nervure thickened ; uniformly 

 bright silvery-white to the cilia, and without any trace of 

 markings. Hind wings ample ; silvery yellowish-white, 

 with cilia of the same tint. Female a little smaller and with 

 a thicker body, otherwise similar. 



Underside of the fore wings leaden black ; cilia white. 

 Hind wings leaden brownish-white. 



On the wing at the end of June and in Julv. 



Lahva aqd food totally unknown. 



