244 LEPIDOPTERA. 



pointed tuft in front and a cross-ridge above it ; thorax 

 with a ridge down the middle of the back ; abdomen round, 

 smooth, and devoid of crests ; fore wings broad, thick, 

 crenulated behind ; hind wings broad ; cross-bar angulated ; 

 vein 5 arising upon it close to vein 4. 

 We have but one species 



1. O. lunaris, Schiff. — Expanse 2£ to 2± inches. Very 

 robust ; thorax ridged on the back ; fore wings thick, ashy- 

 brown, darker behind ; first and second lines distinct and 

 direct ; reniform stigma black-brown. Hind wings pale 

 smoky-brown to the middle, darker beyond. 



Antennae of the male rather stout, simple, cylindrical, 

 hardly ciliated, light brown, the back portion toward the 

 base white ; palpi stout, oblique, covered with closely 

 appressed scales, brown ; apical joint long and pointed ; 

 head smoothly tufted, olive-brown, with an angulated white 

 line across the face ; thorax stout, almost massive, thickly 

 and smoothly covered with scales, but with a sharply raised 

 ridge-like edge down the middle of the back, olive-brown ; 

 fascicles brownish-yellow ; abdomen silky, pale yellow-brown, 

 stout, and rather conical ; lateral tufts rather small ; anal 

 tuft compressed and pointed. Fore wings broad and ample ; 

 costa gently arched ; apex angulated ; hind margin strongly 

 crenulated, gently rounded, and but little oblique, more so 

 toward the anal angle ; dorsal margin nearly straight ; 

 colour brownish-drab or ashy-brown to the second line, 

 beyond this umbreous; close to the base is a small black 

 spot ; first line nearly perpendicular, very even and direct, 

 brownish-white, edged on each side with dark brown, and 

 again in the dorsal portion with smoky-brown ; second line 

 rather erect but gently curved, placed far from the hind 

 margin, brownish-white faintly edged inside with umbreous, 

 very strongly so outside, and clouded with black toward the 

 costal and dorsal margins ; subterminal line excessively 

 angulated and irregular but faint, placed in the middle 



