259 



This species is easily recognized by its want of any markings on the 

 wings, except the two costal dark spots, which are usually wanting in most 

 cabinet-specimens, and by the well-marked pectinated antenn;e. It varies in 

 tint, being pure clay-ash, or with an olive-greenish tinge, with sometimes but 

 one, rarely two, costal spots, and usually none at all. 



MARM( UTERYX, gen. nor. Plate 3, fig! 3, 3a. 



Compared with certain species of Thamnonoma, such as T.argillacearia, 

 which certain species resemble, it is found to differ in the fore wings not being 

 subfalcate, the costa being straight, the apex well rounded, while the outer 

 edge of the wing is not excavated, being more or less oblique. The hind 

 wings are rounded, not angulated, and somewhat produced toward the apex. 

 The front of the head is full, bulging out much more than in Thamnonoma. 

 The palpi are short, not projecting tar beyond the front, while the male an- 

 tenna? arc not pectinated, simply ciliated. Venation : two large subcostal 

 cells; costal vein free from the subcostal; the two discal venules transverse; 

 the posterior one bent. 



In coloration, the species are remarkable for the white spots and bands 

 on the clay-colored ground -color, while the fringe is usually whitish, conspic- 

 uously checkered with brown; and beneath, the wings, especially the hinder 

 pair, are beautifully marbled with white and brown. 



Synopsis of the Species. 



Fore wiiijis much rounded, marbled above M. strigularia. 



Larger than the other two species; lore wings much pointed )/. marnwrata. 



Fore wings acute; golden-yellow M. lessellata. 



Marmopteryx strigularia Packard. Plate 9, fig. 65. 



Anisopteryx strigularia Minot!!!, Proc. Bost. Soc. Nat. Hist., xii, 170, 1869. 

 Tephrina strigularia Pack., Proc. Bost. Soc. Nat. Hist., xiii, 393, 1871. 

 Larentia ceneiformis Harvey, Bull. Buffalo Soc. Nat. Sci., pi. 11, fig. 5, 1974. 



5 J and 2 9. — Fore wings much rounded at apex; median venules 

 rather short: front of head less full and protruding than in M. marnwrata 

 from Nevada. Body and wings uniform sable ash-color, mixed with blackish 

 scales on the front of thorax, and on head and palpi. Male antenna' annu- 

 latcd above with blackish. Fore wings with three large costal white spots, 

 from the outer of which proceeds a curved broad shade, which fades away on 

 the independent venule, but may be traced as it curves around nearly to the 



