308 LORD WALSINGHAM ON [Feb. 15, 



Head pale fawn-colour, the face somewhat paler. Palpi fawn- 

 colour at the sides and beneath, paler above. Antennae annulated 

 with whitish and fuscous. 



Fore wings with tlie costa arched, the apex not falcate, together 

 with their ciUa pale fawn-colour, more or less suffused or sprinkled 

 with purplish, having a purplish fuscous diffused streak running 

 from before the middle to the apex, dividing the apical half of the 

 wing into two nearly equal parts. There are two purplish fuscous 

 spots on the dorsal margin, the first at the rather conspicuous angle 

 near the base, the second scarcely beyond the middle. The cilia at the 

 anal angle are very long, giving the whole wing a falcate appearance. 



Hind wings pale fulvous grey, the cilia somewhat paler. 



Abdomen above pale cinereous, beneath (together with the legs) 

 whitish. 



760. Expanse 20 millim. 



I have two specimens of this species — one reared from a cocoon 

 found on the trunk of an evergreen oak. May 18, near San Francisco, 

 the other from a cocoon found on June 14, on a leaf of Helianthus 

 lolanderi (Gray), in Mendocino county, California. The first 

 emerged on May 31, the second on June 27, 1871. It is allied to 

 Cerostoma parenthesella, Linn, {costella, Fabr.), Wocke, 1641. 



Cerostoma stjbltjcella, sp. nov. (Plate XXXV. fig. 9.) 



Capite albo ; antennis albo et fusco annulatis ; thorace cuneum 

 album gerente ; a lis anticis costa arcuata, apice subfalcato, 

 suhfulvo-cervinis, ciliis et patagiis unicoloribus ; posticis cum 

 ciliis cinereo-albidis, margine paulo adumbrato. 



Head white ; palpi white above, fawn-colour at the sides and 

 beneath. Antennaj animlated with white and fuscous. Thorax with 

 a white wedge-shaped mark pointing backwards from the head. 



Fore wings with the costa slightly arched, the apex subfalcate, 

 fawn-colo\ir with a slight tawny gloss ; the patagia and cilia are of 

 the same colour. The hind wings and their cilia are dirty whitish, 

 slightly tinged with cinereous along their margins and at the base 

 of the cilia. 



Expanse 15-17 miUim. 



Three males, two females. 



Mendocino and Lake cotinties, June 10 to 17, and Shasta county, 

 Cahfornia, July 19, 1871. 



This species belongs to the same group as C. sylvella (Linn.), C. 

 alpella (Schiff.), and C. lucella (Fab.). It is most nearly alhed to 

 the latter, differing from it in the white wedge-shaped thoracic 

 mark, in the darker fawn-colour of the fore wings, which are also 

 of a more uniform width, not attenuated towards the base as in the 

 European species, and in the much paler hind wings. 



Cerostoma dentiferella, sp. nov. (Plate XXXV. fig. 10.) 



Capite, thorace et palpis (supra) stramineo-albidis ; antennis 

 annulatis ; patagiis dilute castaneis. Alis anticis a basi ad 

 apicem jmr^iurascen/i-brunneo suffusis ; costce basi, margine 



