SYNNOMA. — 1 DIOGE APHIS . 
25 
The larvfe feed in colonies, in a web, on Lynosyris viscicUflora, the cocoons being also 
formed in the common web, after the manner of some species of the genus Hyponomeuta 
among the Tincina. I met with them on the plains to the north-east of INIount Shasta, Cali- 
fornia, at the beginning of September 1871 ; and the perfect insects emerged at the end of 
October. 
RETINIA, Gum. 
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 them 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. 3 ? . Ex- 
panse of wings 14 millims. 
Rouge River, June 1872. 
In the genns Retinia, Walker's two American species are as follows : — 
Retinia yeorgiana, Walk. : see Cacoecia georgiana, p. 9. 
argxjrosinla, Walk. ; see Cacoecia argyrospila, p. 8. 
IDIOGRAPHIS, 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. inopimia, Haw., has 
been very shortly characterized by these authors. Its affinities appear to bring it nearer to 
the genus Cochylis, Tr., than to Toririx, 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 antennse are pubescent in the male. The fore wings — with an appressed fold, 
covering about one thii'd of the costa in the male — are slightly arched, the apical mai'gin 
rather oblique, convex, the dorsal margin also slightly convex. Vein 2 of the fo7'e ivings 
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 fulviplicana. (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 ; aj)ical margin 
oblique convex ; an appi'essed 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 
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