NORTH AMERICAN LEPIDOPTERA. 325 



O. hayesi Grt, Bull. Buff. Soc. N. Sci. i, 106, pi. 3, fig. 13, 1873. 



Head thorax and priniHries a dull luteous gray, powdery, markings of primaries 

 fuscous brown. Basal line visible, faint, single: t. a. line single, outwardly oblique 

 from costa, outwardly and roundedly exserted on the interspaces and sometimes 

 dentate in the cell; t. p. line single, outwardly curved over the cell, some- 

 what incurved in the submedian interspace, outwardly dentate on the veins. 

 Through the outer portion of the median space is a broad, distinct, upright, or 

 only slightly curved transverse shade, which rarely becomes faint enough to 

 cause a dnubt as to its presence. The ordinary spots are large and rather vague ; 

 the orbicular round, faintly pale ringed with centre of ground color of prima- 

 ries ; the reniform is more indefinite, broad, also pale ringed and with concolor- 

 ous centre; beyond the t. p. line the s. t. space is paler than ground color, the 

 veins marked with fuscous, rapidly darkening near the s. t. line and forming a 

 distinct dusky preceding shade; s. t. line powdery, irregularly dentate, nearly 

 parallel to outer margin, paler, marked principally by the dark preceding shade ; 

 terminal space of ground color or a triflie darker; a narrow, more or less inter- 

 rupted terminal tine. Fringes concolorous with primaries, with a dusky line at 

 base. Secondaries yellow, with a broad, black outer margin. Beneath j)ale 

 straw yellow, with broad black outer margin on each wing; primaries paler. 

 Abdomen rather clear luteous. Expands 1.12 — 1.25 inches ; 28 — 32 mm. 



Hab. — British Columbia, Colorado, Nevada Co., Cala. (Sept.). 



The species is readily recognized by the superficial characters 

 already pointed out. The genitalia of the % are also distinctive. 

 The harpes are elongate, the inferior margin rounded and oblique 

 towai'd tip, where they are obliquely truncate. The clasper is cor- 

 neous, from about the middle of inferior margin, dilated at middle, 

 then narrowing rather suddenly to a long acute tip. 



The species seems the least common of this group. 



O. dayi Grt., Bull. Bufl'. Soc. N. Sci. i. 105, 3, fig. 8, 1873; Bull. U. S. Gcol. and 

 Geog. Surv. iii. 116. 

 Head, thorax and primaries mixed brown and gray, the shades rather sharply 

 contrasted and not entirely constant. Primaries with basal line distinct, black, 

 followed by a narrow pale line, more or less distinct according as the specimen is 

 well or ill marked. Basal space else fuscous brown to the t. a. line. T. a. line 

 not vei'y distinct, geminate, the included space pale, very irregularly dentate 

 and angulate, its general course outwardly oblique. The black edging to the 

 t. a. line is fragmentary and partly on each side of the pale central space. T. p. 

 line geminate, brown or black, the included space pale ; very strongly exserted 

 over the cell and there even ; somewhat incurved in submedian interspace and 

 there somewhat irregular. Between the ordinary spots the median space is 

 darker, the broad shade thus inaugurated narrowing suddenly below vein 2. 

 In bright specimens the inferior part of median space and the upper part to the 

 orbicular is ashen gray, in dark si)ecimens it is obscure fuscous brown and all 

 intermediate shades occur. The claviform is distinct and usually pale, variable 

 in size, as the median si)ace is broader or narrower. Orbicular round, moderate 

 in size, black ringed, followed by a pale ring, the centre brown or fuscous. Eeui- 

 form moderate, normally shaped, distinct, with a narrow black margin, followed 



