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The perfect insect is out in June and July. 
The caterpillar is brownish-black with yellow hairs and 
black tufts or tussocks on the fifth, sixth, seventh, and 
eighth segments, with white hairs on each side, and a 
larger tuft or tussock of black on the twelfth. 
The date of the appearance of the caterpillar is found 
in September and in May. 
The caterpillar feeds on different common plants. 
OKGYIA CCENOSA. 
Plate XII. Figure 5. 
This insect measures from one inch and a half to rather 
more than one inch and three quarters in expanse. 
Male: fore wings white, clouded with pale brown. 
Hind wings white, slightly clouded with brown. The 
antennas are thickly pectinated. 
Female : fore wings pure glossy white. Hind wings 
pure glossy white. 
Localities for this species are Burwell Fen, Whittle- 
sea Mere, Bidston Marsh near Birkenhead, and Altcar 
near Liverpool. 
The situations where it is found are the fens. 
The perfect insect appears in July and August. 
The caterpillar is black but covered with yellow hairs, 
and with three yellow tufts on the back, between two 
long black ones. 
The date of the appearance of the caterpillar is in May. 
It feeds on the reed (Arundo phragmitis ), on the 
prickly twig-rush (Cladium mariscus ), also, it is said, 
on the flowering-rush (Butomus umbellatus). 
