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narrower ones, the upper margin black or brownish-black, 

 lower margin brownish-black, outer margin also brownish 

 black in a wide patch. Hind wings white, or yellowish 

 white, with a broad border on the outer margin of black or 

 brownish-black, and two streaks of the same across, the 

 upper one sometimes merged in the darker colour of the 

 base, but black about the inner corner, more or less en- 

 croaching on the white portion; the outer edge white or 

 yellowish- white. 



Female: fore wings dull yellowish rusty brown; cen- 

 tral spot dark brown. Hind wings dull yellowish rusty 

 brown; the edge paler. 



Localities for this species are Stockton near York, 

 Buttercram.be Moor, Perry Wood near Faversham, Edin- 

 burgh, Torwood, Pitlochrie, Stowmarket, Durham, Guild- 

 ford, Worthing, Scarborough, Pembury, Lower Guiting, 

 Newcastle-on-Tyne, Holy well, Black Park, Huddersfield, 

 Darlington, Lewes, Bristol, Lyndhurst, Birkenhead, Man- 

 chester, Brighton. 



The situations where it is found are fir woods and plan- 

 tations, where it generally flies about the higher parts of 

 the trees in the day-time, and is rather difficult to capture. 



The perfect insect appears in May and June. 



The caterpillar is green with a white line along the 

 back, a yellowish-white one below it, and a yellow one on 

 the sides. 



The date of the appearance of the caterpillar is in 

 August and September. 



It feeds on the fir. 



The chrysalis occurs under the ground. 



This species flies in the day-time. 



