2i8 The Scottish Naturalist. 



Lat. 55''4o'-57°4o'. Range in Europe. Central and northern. 

 Type. Centro-septentrional. Type in Britain. British. 



Time of Appearance — Imago. June. Larva. July - September. 

 Food-plant. Birch, &c. 



The ab. albocrenata Curtis, in which the whole centre of the wing is occu- 

 pied by a more or less broad, pale band, is not uncommon in mountain glens. 



TRUNCATA Hufn. (1769); russata Bkh. (1794). Common. 



Nemoral Ascends to 1400 feet. 

 Distribution — East. Tweed Forth Tay Dee Moray § 



Orkney o 

 West. Sohvay Clyde g West Ross g 

 Lat. 54°4o'-59°io'. Range in Europe. Central and northern ; 

 (not in Iceland). Type. Centro-septentrional. Type in 

 Britain. British. 



Time of Appearance — Imago. May- August. Larva. August- April ; 

 May, June. Food-plant. Low plants. 



IMMANATA Hw. Abundant. Nemoral. Ascends to 1500 feet. 

 Distribution — East. Tweed Forth Tay Dee Moray Suther- 

 land Orkney Zetland 

 West. Solway Clyde g . g g 

 Lat. 54°4o'-6o°2o'. Range in Europe. Central and northern ; 

 (occurs in Iceland). Type. Centro-septentrional. Type 

 in Britain. British. 



Time of Appearance — Imago. July. Larva, April -June. Food- 

 plant. Low plants. 



This and the last are exceedingly similar, but differ in the shape of the 

 front wings, and of the central band, and in the time of appearance. Both 

 species are variable, but inimanata especially; but amidst so many aberra- 

 tions, passing one into the other, it seems undesirable to distinguish any by 

 the names which have been applied to them. 



SUFFUMATA Hb. Common. Nemoral and ericetal. Ascends 

 to above 2000 feet. 



Distribution — East. Tweed Forth Tay Dee Moray goo 

 West, g Clyde g g g 



Lat. 55°3o'-57°4o'. Range in Europe. Northern and cen- 

 tral. Type. Septentriono - central. Type in Britain. 

 British. 



Time of Appearance— Imago. May. Larva. June. Food-plant. 

 Low plants. 



The ab. piceata Stph. (nearly unicolorous, fuscous brown) occurs in several 

 places. 



