266 LEPIDOPTERA. 



[S. sinuaua, Stqjli. The type, which is iu tiie National 

 Collection, appears to be an aberration of -S'. clirii^iantheana. 

 R. S.] 



7. S. pascuana, Hub. ; pasivana, Huh. (error). — Ex- 

 panse § to 4 inch (16-20 mm.). Fore wings rather elongate- 

 ovate, smooth and of greasy appearance, slate-grej', often 

 uni-colorous. 



Antennte grey-brown ; palpi, head, and thorax slate-grey ; 

 abdomen bi'ownish-grey, the anal tuft tinged with ochreous. 

 Fore wings very narrowly ovate and elongated ; the apex 

 and hind margin rounded ; brownish-slate colour or greasy 

 brown-grey, the markings often only just indicated on the 

 dark ground, when visible the basal blotch large, angulated 

 outwardl}' ; central band oblique, of moderate width, its 

 margins waved ; apical and hinder area gently shaded with 

 darker clouding and containing a few obscure black dots ; 

 cilia grey. Hind wings smoky brown ; cilia hardly paler. 

 Female of the same expanse of wing but the fore wings 

 a little broader, and the markings more strongly expressed. 



Underside of the fore wings uniform leaden-grey. Hind 

 wings smoky brown. 



This species seems to have a very singular local and per- 

 manent variety in which the usual brownish-slate colour is 

 replaced by yellowish-brown, either without markings or as 

 already described, but in darker yellow-brown. This form 

 seems to be confined to salt marshes, and is more particu- 

 larly plentiful in those towards the mouth of the Thames. 



On the wing from June till August. 



Larva rather stout, tapering very slightly from the 

 middle ; semi-transparent, pale greenish-grey ; spots black ; 

 head very pale brown ; dorsal and anal plates even paler, 

 and indistinct. 



May, June, and the beginning of J uly on Anthanis arvcnsis, 

 Hyjjochceris radicaia, Chrysanthemum Icucanthcvmm, Achillea 

 millefolium, and other composite flowers ; also on those of 



