NORTH AMERICAN LKPr])OPTERA. 339 



The uniform powdery fuscous color is distinctiv^e, the markings 

 while all present are not prominent. 



The harpes of male are moderate, somewhat curved, the lower 

 margin curving obliquely to an acutely rounded tip, the innerside 

 fringed with spinules. The clasper is an unusually long, slender, 

 somewhat curved hook, obliquely crossing the harpe and extending 

 somewhat beyond it. The species is unique in this respect. 



It seems to be rare. 



O. hoiiiogena Grote, Bull. Geog. and Geol. Surv. iii, 800. 



Head, thorax and primaries pale, somevvhat yellowish gray. Primaries with 

 basal space evenly pale, powdery. Basal line single, black, distinct. T. a. line 

 broad, black, single, even, oblique, with a slight outward curve. T. p. line nar- 

 row, single, rather evenly curved over the reniform, with small outward teeth 

 on the veins below that point. Median space darker than the remainder of the 

 wing. Claviform marked by a small, irregular black patch on the t. a line. 

 Orbicular rather small, round, pale, edged with black scales. Eeniform large, 

 of the usual shape, pale, but not discolorous, narrowly and incompletely edged 

 with black scales. A darker, diffuse, and irregular median shade between the 

 ordinary spots and somewhat inwardly oblique, unusually close to the t. a. line. 

 S. t. space whitish powdered beyond t. p. line darkening to the s. t. line, which 

 is very distinctly defined by this dark shade. It is very irregular and diffuse, 

 marked with white scales and not distinctly defined from the terminal space; a 

 row of fuscous terminal lunules. Fringes gray, cut with fuscous. Secondaries 

 dirty white with a faint discal lunule and a somewhat well defined smoky outer 

 band. Beneath, the primaries are smoky, paler toward inner margin, darker 

 outwardly. Secondaries very much as above, but more powdery. Head with a 

 frontal transverse dark line. Collar concolorous with basal space of primaries, 

 and with a dusky basal line. Thorax darker, more mixed with blackish scales. 

 Expands 1.25— 1.40 inches; 31—35 mm. 



Hub. — Colorado, Nevada. 



A well marked species which I have seen from Colorado only. 

 The strongly defined median space and the pale basal space limited 

 by the broad, even black t. a. line are distinctive. 



The genitalia of the male have the harpes somewhat curved, end- 

 ing in a regularly curved, oblique tip, which is well fringed with 

 spinules at innerside ; the clasper extends rather more than half way 

 across the harpe, and is gracefully curved, gradually narrowing 

 from the innerside to an acute point. 



O. ooeata Grt.. Tr. A. E. S. 1874, v, 114, Cleophmm: Bull. Buff. Soc. N. Sci. 

 1875, iii, 9 and 16. pi. 2, fig. 6, Cleophana ; id. iii, 87, Oncociiemis ; Stett. Ent. 

 Zeit. 1876. v. 37, 1.36, Oncocnemis. 



" J _ — The eyes are naked ; the frontal vestiture converges from the sides, but 

 conceals no clypeal protuberance. Tibiae unarmed, but the fore tibite have a 



