218 INSECUTOR INSCITI^ MENSTRUUS 



Expanse, male, 27 mm. ; female, 30 mm. 

 Habitat. — Popocatepetl Park, Mexico. 

 Type.— Cat. No. 25642, U. S. Nat. Mus. 



Hydriomena mainaria, new species. 



Male. — Palpi fuscous fringed above with white. Head, col- 

 lar, and thorax fuscous ; some white on f rons ; neck white ; 

 white mottling on patagia. Abdomen whitish buff, dorsally 

 suffused with brownish gray. Fore wings fuscous, the veins 

 irrorated with black, also the cell and inner margin ; faint 

 traces of a postmedial curved line, and a dentate subterminal 

 line ; basal half of cilia brownish at base, darker outwardly, the 

 outer half whitish divided by a gray line. Hind wings white 

 slightly suffused with brownish gray ; a very faint double post- 

 medial line, the most distinctive character of this inconspicuous 

 species ; a darker narrow terminal shade ; cilia white. Fore 

 wings below silvery white suffused with brownish gray from 

 above cell and vein 2 to costa; the veins dark; a fine, straight, 

 postmedial line from costa to vein 2 ; a subterminal fuscous 

 shade, wide on costa, then narrower to vein 2 ; a terminal 

 fuscous line; cilia whitish tipped with fuscous. Hind wings 

 below silvery white with a few avellaneous irrorations and 

 terminal line. 



Expanse, 26 mm. 



Habitat. — Popocatepetl Park, Mexico. 



Type.— Cat. No. 25643, U. S. Nat. Mus. 



Date of puhlication, December 28, 1922. 



