98 LKI'IDOPTERA. 



North America it appears to have been taken in the mountains 

 of Colorado, and in Labrador. 



3. M. rivata, llidi. — Expanse 1 to J^ inch. Fore winj^s 

 white with a broad smokj'-Wack or bhjck-brown central band, 

 tbl lowed by a Ijroad Ijaud of the white ground colour; base 

 and hind mari^in smoky-grey. Hind wings white with the 

 hind margin broadly mottled with grey. 



Antenna' of the male simple, almost naked, light brown; 

 palpi minute, not concealing the tongue ; eyes bronzy-black ; 

 face and head black-brown dusted with pale brown ; thorax 

 whitish-brown, dusted and spotted with black ; abdomen 

 white, similarly dusted; anal tuft ochreous. Fore wings 

 broad, eosta gently arched ; apex l)luntly angulated ; hind 

 margin crenulated and softly curved ; dorsal margin nearly 

 straight, ciliated ; ground colour white ; basal blotch pale 

 grey-brown edged by a slender purple-brown stripe, beyond 

 wliich is a narrow smoky-brown shade ; first line rather up- 

 right, curved and a little indented ; second also tolerably 

 upright, sinuous, and forming one large blunt angle outward 

 above the middle ; both black and forming the margins of a 

 conspicuous brown-black or bluish-black central band in 

 which is the still blacker discal spot, and above it often 

 a little white dusting toward the eosta ; following this 

 band is a broad parallel stripe of the ground colour, con- 

 spicuously snowy-white, sometimes faintly intersected by 

 minute brown and grey cloudy dots ; hind marginal space 

 occujued by a broad band of grey clouds, looped lines, 

 and shades, intersected by the subterminal line, placed in 

 crescents, and pure white ; in this marginal band a darker 

 cloud above the middle is margined above by a whiter shade 

 which runs into the apex of the wing ; cilia pale purplish- 

 brown intersected with darker and spotted with white. Jlind 

 wings rounded, crenulated behind, white; central spot a 

 black dot ; immediately following it are three slender, in- 

 distinct, smoky-grey lines, all shaded off inwardly ; along the 



