GREY MOUNTAIN CARPET. I9I 



In its typical form the fore wings are white, inclining to 

 greyish, with a number of brownish or dark-grey cross lines ; 

 two pairs on the central area are marked with black. Some- 

 times the wings are greatly suffused with smoky grey, and this 

 tint in examples from the Sheffield and Rotherham districts of 

 Yorkshire assunies a much darker hue, so that all the markings 

 are obscured, but the veins are blacker. 



The caterpillar is green, marked with some irregular reddish 

 blotches ; a yellowish line along the back. It feeds in August, 

 earlier or later in some seasons, on mountain ash {Pyrits 

 auaiparia\ and the moth, which rests by day on tree-trunks, is 

 out ill July and early August. The haunts of the species are 

 chiefly in hilly localities of the northern counties of England, 

 but it has also been reported from Gloucestershire (Cotswolds), 

 Somersetshire (Weston-super-Mare), and Devon (Dulverton). 

 In Wales it occurs in Merionethshire, as well as in Cardigan- 

 shire ; and in Scotland it spreads from Roxburghshire, where it 

 is locally common among mountain ash, through Clydesdale to 

 Inverness. It is widely distributed in Ireland. The range 

 abroad extends to Japan and North America. 



Grey Mountain Carpet {Enfephria ccesiatd) 



The typical greyish form, with blackish wavy cross lines and 

 dark central band, is shown on Plate 80, Fig. i $ and 2 $. 

 Figure 3 represents a specimen from Shetland in which the 

 band is sooty black (ab. annosaia, Zetterstedt = nigristriaria^ 

 Gregson). The interesting blackish suffused form from the 

 Isle of Arran (Fig. 4) leads up to a still blacker variety, occurring 

 in the same isle, and also in the Shetlands, in which the whole 

 of the fore wings is nearly as dark as the central band of Fig. 3, 

 and the hind wings are also much darkened ; such specimens 

 are referable to ab. glaciata, German Ab. prospicuata, Prout = 

 gelata, Staud., is a form with the fore wings whitish, and the 



