91 



apical, oI)li(|iie, black line is distinct and oWvu disloratcd. 'riicru arc iisnally 

 two parallel dusky bands on the hind winijs. 



'I'lie sp(>cics ar(> distinguished from those of Felrophora by the oblonj^ 

 wings, nnusually obtuse at the apex, the hind wings, scarcely extending 

 beyond the tip of the abdomen, by the i)n)ad tuft at the end of the abdomen, 

 and the unusual style of coloration a* well as the unusual venation. 



This genus as developed in North America contains both of tiie two 

 coninioii European species and three others besides, so that this country may 

 be looked upon as the center of distribution for the northern hemisphere. 



Larra. — " Quite short, cylindrical, thick, a little moniliform, with numer- 

 ous conspicuous lines; head small and globular: living exposed on trees 

 and shrulis." 



i'uya. — "Contained between leaves." — Guenee. 



Si/7iO]ms of the Species. 



A. Fore wings with the bands edged with black, obli(pic, and wavy lines: 



Fon^ winjiN oblong ; apex rectaiigular ; bands bordered with grconi.sh H. trifaeeiala. 



Fore wings pointed ; bauds usually bordered with reddish --H. cali/uriiial<i. 



B. No black lines ; wings crossed by sciveral distinct, smoky, or white lines: 



Fore wings pointed; a marginal smoky Hue, olive-greeu, or reddish U. sordidafa. 



Fore -wings with apex rectangular, brown, with five distinct smoky bands; mar- 

 gin of wing not smoky ^- '^-fasciata. 



Fore wings black, with live conspicuous white bands i/. sj)(ci(»«a/a. 



Hydriomena trifasciata Packard. Plate 8, fig. 29. 



" Geomctra trifmdala Uork., Eur. Schni., v, 308, 1794." 



" Geometra impluriuta Den. and Schiff., Verz., 109, n. Cat." 



" Hiibu., Schm. Eur., •22:{ (post 1797)." 

 Acidalia imphniata Treits., Schm. Eur., vi, ii, 21, 1828. 

 Timpchs impluriata Steph., Nomenel. Br. Ins., 44, 1829; " Cat. ii, 1829." 

 Larcntia imphiviata Dup., Lep. France, viii (v), 424, pi. 200, tig. 3, 1830. 

 KuthuHa impliiiiaUi Stepb., 111., iii, 254, 1831. 



Ciduria intpliiriaria Boisd., Gen. Ind., 214, 1840. 

 Larentia implnriaria H.-Sch., Schm. Eur., iii, 168, 1847. 

 Hydnomena imphii-iata Stepb., Cat. Br. Lep., 19.'), 1650. 



Tpsipete.^ impluriala Guen., Phal., ii, 377, 1857. 



Tvslpetes pliiriata Guen., Phal., ii, 378, 1857. 



Ypsipihs impluviata Walk.. List Lep. Het. Br. Mus., xxiv, 1207, 1862. 



yi>8ipete»2>liiriala Walk., List Lep. Het. Br. Mus., xxiv, 1266, 1862. 



(5 i and 4 9. — Palpi long and slender; fore wings rather short and 

 broad, and aj^ex more rectangular than in any of the other species. Body 

 and wings light-gray. Fore wings light-gray, with a |)ale greenish tinge. 



