90 



two dusky lines. Beneath,. dusky on basal two-thirds; discal dots distinct, 

 outer one-third Luteous; pale, with the pale zigzag line on costal half, and on 



hind wing two distinct, dusky lines. 



Length of body, 0.40; leniflli of fore wing, 0.45; expanse of wings, 

 1.00 inch. 



Brunswick, Me. (Packard); Portland, Me. (Morse, Mus. Coinp. Zool.). 



Easily known by the narrow, dark, mesial hand, Mack and very narrow 

 on inner edge, and the pale, zigzag line re-appearing beneath; also, on fore 

 wing, a black streak near apex, and a smaller apical black dot. It is closely 

 related to the European Thera juniperata. 



HYDRIOMENA Hiibner. Plate 1, fig. 6. 



Sydriomena Hiibu. (in part), Vera., 322, 1818. 



Acidalia Tic-its. (in part), Schm. Ear., vi (ii), 5, 1828. 



Vpsipetes Steph., Nomencl. Br. Ins., 44, 1829; "Cat,, ii, 138, 1829." 



Larentia I >np. (iu part), L<-p. France, viii (v), 358, 1830. 



Euthalia Steph. (in part), 111., iii, 252, 1831. 



Cidaria Boisd. (in part). Gen. et Index, 212, 1840. 



Larentia B.-Sch. (in part), Schm. Eur., iii, 141, 1847. 



Hydriomena Stepb., Cat. Br. Lep., 195, 1850. 



Ypsipetes Gneu., Pbal., ii, 376, 1859. 



Walk., List Lep. Br. Mus., xxiv, 1266, 1862. 



\ 



<? and 9. — Head rather larger and a little wider and fuller between the 

 eyes than in Petrophora. Palpi long and porrect, pointed, beak-like ; the 

 hairs close; the entire appendage rather stouter than in Petrophora, and fully 

 as long. Antennae, of male ciliated. Fore wings rather longer and often 

 narrower, with the apex not subfalcate, as usual in Petrophora and other 

 genera of the subfamily, but the apex is obtuse ; outer edge oblique, as in 

 Petrophora ; hind wings shorter than in Petrophora, and much more pro- 

 duced toward the apex. Venation: two large, equal, subcostal cells; the 

 subcostal venules very short, shorter than in any other genus except Thera ; 

 the second subcostal venule co-originating with the fifth on the other side of 

 the main vein. The discal venules well marked; the posterior bent. Abdo- 

 men rather stout, ending in a broad tuft of hairs, rather shorter than in Petro- 

 phora. The hind legs with the tarsi as long as the tibiae. In coloration, this 

 genus differs decidedly from Petrophora by the greenish hues, often turning 

 dull red, and the broad smoky bands alternating with the grayish and green- 

 ish 1 Is, which are bounded by black lines, and are irregular, wavy. The 



