STNNOMA. — IDIOGEAPHIS. 25 



The larvse feed in colonies^ in a web^ on Lynosyris viscidiflora, the cocoons being also 

 formed in the common web^ after the manner of some species of the genus Hyponomeuta 

 among the Tineina. I met with them on the plains to the north-east of Mount Shasta, Cali- 

 fornia, at the beginning of September 1871 ; and the perfect insects emerged at the end of 

 October. 



RETINIA, Guen. 



Eetinia subcervinana. (Plate LXVI. fig. 1.) 



Head pale fawn-colour above; face white; palpi white, very short, the second joint 

 roughly clothed ; antennae simple. Fore wings silvery whitish, transversely lined and. blotched 

 with pale fawn-colour, giving tliem an almost reticulated appearance, with a few thinly 

 scattered fuscous scales, especially along the costa : cilia white, tipped with fuscous. Hind 

 wings pale brownish fuscous. Legs white, the first pair spotted with fuscous. 2 ? . Ex- 

 panse of wings 14 millims. 



Rouge River, June 187'2. 



In the genus Retinia, Walker^s two American species are as follows : — 



Retinia georgiana, Walk. : see Cacmcia georgiana, p. 9. 

 argyrospila, Walk. : see Caccecia argyrospila, p. 8. 



IDIOGEAPHIS, Led. 



This genus, used by Lederer (Wien. entom. Monat. no. 8. 1859, Band iii. p. 242) and 

 by Heinemann (Schmett. Deutsch. und der Schw. Band i. Heft 1, pp. 31-38) as a subgenus of 

 Tortrix, Linn., for the reception of a single species, T. centrana, H.-S., = T. inopiana, Haw., has 

 been very shortly characterized by these authors. Its affinities appear to bring it nearer to 

 the genus Cochylis, Tr., than to Tortrix, Linn. The palpi project more than the length of 

 the head beyond it; the second joint is stout and thickly clothed, the apical joint short and 

 exposed. The antennae are pubescent in the male. The fore wings — with an appressed fold, 

 covering about one third of the costa in the male — are slightly arched, the apical margin 

 rather oblique, convex, the dorsal margin also slightly convex. Vein 2 of the fore wings 

 arising from the outer third of the cell. The middle, vein of the hind wings with no long hairs 

 at the base. The inner tarsal spur decidedly longer than the outer. Anal tuft moderate. 



Separated from Cochylis by the decided costal fold in the male, but agreeing in neuration. 



IdiograpMs fulvipUcana. (Plate LXVI. figs. 2 & 3.) 



Head yellowish straw-colour : palpi not profusely clothed, extending nearly twice the 

 length of the head beyond it, pale whitish yellow above, brown or tawny at the sides beneath : 

 antennae tawny, pubescent in the male. Fore wings — with the costa arched ; apical margin 

 oblique convex ; an appressed tawny brown costal fold in the male — rather shining whitish, 

 much blotched with yellowish straw-colour; a tawny spot at the end of the cell precedes an 



E. 



