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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, 
Buttercrambe Moor, Perry Wood near Faversham, Edin¬ 
burgh, Torwood, Pitlochrie, Stowmarket, Durham, Guild¬ 
ford, Worthing, Scarborough, Pembury, Lower Guiting, 
Newcastle-on-Tyne, Holywell, 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. 
