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Show 308 LORD WALSINGHAM ON [Feb. lo, 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 the costa arched, the apex not falcate, together with their cilia 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, M a y 18, near San Francisco, the other from a cocoon found on June 14, on a leaf of Helianthus bolanderi (Gray), in Mendocino county, California. The first emerged on May 31, the second on June 27, 1871. It is allied to Cerostoma parenthesella, Liun. (costella, Fabr.), Wocke, 1641. CEROSTOMA SUBLUCELLA, sp. nov. (Plate XXXV. fig. 9.) Capite albo; antennis albo et fusco annulatis; thorace cuneum album gerente; alis anticis costa arcuata, apice subfalcato, subfulvo-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. Antennae annulated 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-colour 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 millim. Three males, two females. Mendocino and Lake counties, June 10 to 17, and Shasta county, California, July 19, 1871. This species belongs to the same group as C, sylvella (Linn.), C. alpe/la (Schiff.), and C. luce/la (Fab.). It is most nearly allied 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 purpurascenti-brunneo suflusis; costa? basi, margine |