BOARMID.^—BISTON. 127 



fined to woods and districts with plenty of scattered trees, 

 and in such suitable places to be found almost everywhere in 

 the South, East and West of England, and more rarely in 

 the Midlands ; more frequently in Cheshire, Lancashire and 

 Yorkshire, Westmoreland, and Cumberland ; probably also 

 throughout Wales, since I find it recorded in North Wales 

 and Glamorganshire, and have taken it very uncommonly in 

 Pembrokeshire. In Scotland there appears to be but a 

 single record — from Thornhill near Dumfries ; in Ireland it 

 is very rare, two specimens have certainly been obtained in 

 the County Wicklow ; and Mr. Kane adds Mallow, Cork. 

 Abroad it is found throughout Central Europe, Northern 

 Italy and Southern and Eastern Russia. 



3. B. betularius, L. — Expanse If to 2J inches. Very 

 robust ; body and wings white, all abundantly dusted (or 

 peppered) all over with black, usually having black transverse 

 lines on the fore wings, and the costa spotted with black. 



Antennee pectinated with stout ciliated teeth to three- 

 fourths their length, thence simple, brown-black, back of the 

 shaft white ; palpi short, porrected, but much concealed by 

 the erect hair-scales of the face, black ; lower portion of the 

 face brown-black ; upper portion and head white, rough, the 

 raised scales disposed in two tufts, divided by a channel 

 between the antenna3 ; collar white, faintly barred with black 

 dotting, but edged at the back with black ; thorax densely 

 covered with raised, loose, soft scales, white dusted with 

 black, and the slight tufts at the back tipped with black ; 

 abdomen moderately thick but tapering, greyish-white, much 

 dotted with black ; lateral and anal tufts more blackened. 

 Fore wings long, the costal region especially lengthened ; 

 costa arched toward the tip and faintly so throughout ; apex 

 decidedly rounded ; hind margin very oblique, unusually long 

 and hardly rounded ; anal angle distinct though obtuse ; 

 dorsal margin ciliated, almost straight ; colour white, 

 abundantly dusted with black (as though peppered, whence 



