NORTH AMERICAN LEPIDOPTERA. 333 



niediaii, vein. S. t. Hue jmle, interrupted, irregularly sinuate and dentate, pre- 

 ceded by a series of long sagittate intersi)aceal black daslies. A row of black 

 terminal lunules S. t. space pale at t. p. line, rapidly darkening to the s. t. line. 

 The veins are paler through the darker parts of the wing and black marked 

 beyond. Secondaries white, semi transparent, with a distinct black outer border. 

 Fringes white. Beneath whitish, with smoky black outer border. Head with 

 an interantennal blackish line followed by a pale line. Collar with a black line 

 inferiorly, black tipped aud a whitish Hue below the black tip. Thorax also 

 sprinkled with black scales. Expands 1.46 inches; 36 mm. 



Hab.—Ashhy Valley, Utah. 



A single ratlier rubbed specimen without fringes to primaries in 

 Mr. Henry Edwards' collection. 



This species is closely allied to levis, the most obvious sujjerficial 

 distinction being found in the longitudinally ovate orbicular. The 

 ground color is not ochreous and there are other minor differences 

 in niaculation as can be noted by comparing the description. I 

 should scarcely, however, have described this specimen as distinct, 

 but for the decided difference in the genital sti'ucture, which in this 

 genus is so true to one type. The harpes are elongate, the inferior 

 margin curving regularly and gradually to an acute junction with 

 the supeiior margin, the inner edge of terminal margin fringed with 

 long stout spinules. This is very different from the harpes in levis; 

 the clasper, too, is different. It is even for two-thirds of its length, 

 tlieu the inner side is abruptly cut, leaving a long, slender, acutely 

 terminated spur as the continuation of the outer margin. 



The species holds an intermediate jwsition between levis aud an- 

 (/itstus. 



O. aiigiistus Harvey, Bull. Buff. Soc. N. Sci. 1875, iii, 73, pi. 3, fig. 5 ; Grt.. 

 Bull. Geog. and Geol. Surv. iii, 176. 

 Head, thorax and piimaries dark asheu or fuscous gray, powdery, varying 

 somewhat in shade. Primaries with the niaculation distinct, neatly cut. Basal 

 line present, geminate, inner line black, outer Hue fuscous, included space some- 

 what paler than ground color. T. a. line upright or slightly oblique outwardly 

 from costa. geminate, dentate, the outer Hue black, the inner fuscous, included 

 space paler. T. p. line geminate, the lines narrow, the outer indistinct, slightly 

 lunulate, outwardly curved over reuiform and then rather eveuly oblique to the 

 inner margin. Claviform present, somewhat paler than ground color, not well 

 defined, margined by a few black scales. Orbicular large, round, pale ringed, 

 centred with a iialer, more ochery fuscous. Eeniform of the usual shape, pale 

 ringed and centred as in the orbicular. The outer portion of median space is 

 somewhat darker and the mediau shade is obscured aud scarcely traceable in the 

 majority of specimens. S. t. space pale at t. p. Hue, darkening to the rather 

 broad, diffuse, pale, interrupted s. t. line, which is irregularly aud somewhat 

 prominently dentate on the veins. A few darker, irregular spots precede this 



