306 LORD WALSINGHAM ON [Feb. 15, 



Head and palpi whitish, the latter having the tuft on the second 

 joint about the same length as the apical joint. Antennae annulated 

 with brown and whitish. 



Fore wings whitish, dusted with brownish scales, with a brown 

 triangular basal fascia tending obliquely outward from the costa, 

 where it is very wide, and reaches the base of the wing to beyond 

 the first third of the dorsal margin, where it is very narrow. Be- 

 yond this, after a conspicuous oblique fascia of the pale ground- 

 colour, is a large brown V-shaped blotch enclosing a whitish trian- 

 gular costal spot occupying about the middle of the costa ; the apical 

 margin is somewhat narrowly shaded with brown ; and the whitish 

 cilia are touched with brown, especially towards the anal angle. 



Hind wings cinereous, the fringes scarcely paler. 



Expanse 16 millim. 



May 19, near San Francisco; June 16-22, Lake county j July 1.5, 

 Shasta county, California. 



A single specimen of what I suppose to be a variety of this spe- 

 cies occurred on the coast towards the north of California in June 

 1872. In it the whitish ground-colour of the fore wings is entirely 

 suffused with brown, and the markings, although in exactly the same 

 position as in the normal form, are almost obscured. 



The species is much larger than Plutella hufnagelii, Zell., and 

 differs in its markings, but is evidently allied to it. 



Genus Cerostoma (Latreille). 



The only species, among those described by American authors, 

 which has been placed in this genus up to the present time is 

 Cerostoma brassicella (Fitch), which is the well-known cosmopolitan 

 Plutella cruciferaruin (Zell.), as pointed out by Mr. Stainton (Tin. 

 N. Amer. p. 90), also subsequently by Prof. Zeller (Verb. z.-b. 

 Ges. Wien, 18/3, p. 33), and by Mr. Chambers, Mr. Chambers, in 

 his Index to the Tiueina of the United States and Canada (Bull. 

 U.S. Geog. & Geol. Surv. vol. iv. no. 1, p. 134), omits to notice 

 that Mr. Walker (Cat. Lep. Het. B. M. xxviii. p. 546) records the 

 occurrence in Hudson's Bay of Cerostoma xylostella (Linn.) {den- 

 tella, Fabr., Staud. and Wocke Cat. 1652). I have searched for the 

 specimen in the British Museum, and am unable to find it. It is 

 not improbable that one of the allied species, hereinafter described, 

 may have been under Mr. Walker's notice. There is scarcely suffi- 

 cient evidence, in the absence of the specimen referred to, to establish 

 the occurrence of Cerostoma xylostella (Linn.) in America. 



Among the numerous Tineidee which I have received from the 

 Eastern States the genus Cerostoma has been conspicuously absent, 

 affording an additional illustration of the divergence of their Lepi- 

 dopterous fauna from those of California and Oregon. 



Cerostoma instabilella, Mann. 



I am indebted to Mr. Stainton for a specimen of this species, which 

 1 have carefully compared with nine examples taken on Mount Shasta, 



