ic6 LEPIDOPTERA. 



almost parallel with the hind margin ; no other markings, but 

 sometimes a faint dusting of smoky-black or brown-black 

 scales on the basal half of the wings ; extreme hind margin 

 edged with faint pale brown lunules ; cilia bone-white with 

 minute dusky clouds. Hind wings extremely pale smoky- 

 grey or dusky-white, the smoky shading lying between the 

 nervures and being most pronounced toward the hind margin ; 

 cilia white. Female stouter, fore wings slightly narrower and 

 more blunt at the apex ; hind wings a little darker, otherwise 

 similar. 



Underside of the fore wings whitish-brown, clouded with 

 smoky shading beyond the middle, but with the nervures 

 yellowish-white and dorsal margin white. Hind wings 

 white ; costal region faintly dusted with pale brown ; nervures 

 just tinged with brown. Body and legs brownish- white. 



In the collection of Mr. F. J. Haubuiy is a specimen 

 having the first line shown by four black dots arranged 

 perpendicularly, and the second by a complete row from 

 costal to dorsal margin. 



On the wing in June and the beginning of July. 



IjARVA and pupa apparently unknown. 



I have no personal knowledge of the habits of this species, 

 and regret to find myself unable to obtain any as to its 

 more recent discovery. Dr. F, D. Wheeler, however, who, 

 when at Cambridge, had opportunities of learning something 

 of its early history, says: "First discovered at Yaxley in 

 1844 and taken in some numbers in 1848 and 1849. Mr. 

 Brown says that the local collectors took it at the end of 

 June flying in the early daylight, about 3 to 4 a.m., over 

 ground from which the reeds had been cut. Mr. Bond took 

 a few at sugar. It continued to be taken till the draining of 

 the Mere in 1851. The fen was rapidly drained, the surface 

 burnt and ploughed up." But Dr. Knaggs writes: "This 

 species was not taken in Yaxley Fen, but in some drier 

 ground near it. The captor used to pretend that he took it 



