AMERICAN LEPIDOPTERA. 283 



IW. ctliela n. sp. — Expands 30 mm. Palpi and head fuscous ochreous ; au- 

 tenuie fuscous; thorax fuscous ochreous. Abdomen fuscous gray; fore wings 

 cream coh)r from base one-tliird out, with a shading of blackish scales along costa 

 at base, terminated outwardly by a rounded dentate line; beyond, a broad dark 

 gray band with veins all somewhat darker lined, this band scalloped outwardly, 

 the scalloj) being most prominent at vein 4, and the dentations marked by the 

 veins; beyond this band a cream colored line broadening towards costa, followed 

 by a broad dark gray submarginal band, which is somewhat reddish next to the 

 cream colored line; margin blackish: hind wings whitish, a little fuscous tinted 

 outwardly, with line of blackish marginal spots along outer border; beneath 

 light cream fuscous, with darker outer shadings ; hind wings whitish fuscous. 



One % Sierra Nevada, California. 



32. HYDRIOMEXA Huh. 

 Verz. .322, 1818. 



Type trifasciata Bork. 

 Kiiphi/ia lliib., Verz. 326, 1818, tyyte picatd lliib. 

 f Perizoma Hiib.. Verz. 331, 1818, type ndxquata Bork. 

 f Enfephria Hiib., Verz. 331, 1818, type flavicmctdta Hiib. 

 Chlnrodi/sta Hiib., Verz. 332, 1818, type miata L. 

 Dj/fisfroma Hiib., Verz. 333, 1818, type iruncata Hufn. 

 Harpnit/ce Steph., Cat. ii, 131, 1829, ty yte fnlvata Foi-st. 

 YpsipHes Steph., Cat. ii, 138, 1829. type trifasciata Bork. 

 Emmfihsia Ste))!!., Cat. ii. 147. 1829, type decolorata Hiib. 

 Miesia Steph., 111. iii, 1.50, 1831, type decolorata Hub. 

 I'oli/plnafiia Stej)!)., HI. iii, 227, 1831, type immanafa Haw. 

 Euthalia Steph., 111. iii, 2,r2, 1831. type miata L. 

 Thera Stei>h.. 111. iii. 271, 1831, type simnlafa Hiib. 

 I'hasi/lc Dup., Cat. Meth. 254, 1844, type malvala Eamb. 

 Ceratodalia I'ack.. Geom. Moths. 322, 1876, type giieiieata Pack. 



P:ill)i inodei'atc or loni:'; ton^nie of % developed; front with or 

 w ithoiit .■^eale tuft ; autennio flattened, often naked, shortly and finely 

 ciliate below; thorax ,vith posterior tuft more or less developed. 

 Ahdonien often tufted at end ; hind tibije with all spurs; fore wings 

 with two acce-ssory cells, 12 veins; hind wings 8 vein.s, 6 and 7 

 stemmed, 8 with cell to beyond middle. 



Tliis genus, with what I have })laced under Memleuca, C<eiiocalpi\ 

 'frip/iosit, Eiichorid and Oijpmchroa, are all grouped by Mr. Mcv- 

 rick under Htjdi-ioniena. He recognises there are very considerable 

 ditierences in structure which would easily warrant generic sejjara- 

 tion, l)ut thinks the species .<o intergrade in every structural jjoint 

 that it is impossible to draw a distinct line anvwhcre. I aurce with 

 iiim entirely, yet think it wi.ser to draw an artificial line than to 

 lump very widely variant species under one genus, which thus be- 

 comes very hirge and unwieldy, as well as discordimt. In verv few 



TK.\NS. .\M. KNT. SOC. XXIII. AUGUST. 18»() 



