342 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



margin; the subterminal line with no black shading beyond its white 

 border except for a short distance from apex, markedly dentate and 

 sinuate, the angulations deep, the angulation between veins 5 and 6 

 reaching to the cell. Hind wing semihyaline, almost pure white 

 with little or no fuscous shading, the latter, when present, confined 

 to a narrow band along costal margin and a fine line along termen ; 

 cilia white. 



Alar expanse, 33^3 mm. 



Genitalia (figs. 2-2c) with outer margins of vinculum slightly 

 sinuate; elements of transtilla slightly narrower than those of 

 prodenialis. Slight differences in the shape of the anellus in the two 

 species are shown in figures Id and 2b. 



Female.— SimW^Y to the male except that the pectinations of the 

 antenna are shorter, the maxillary palpus is longer and the fuscous 

 shadings are nearly ah\ays pronounced on the hind wing, though 

 limited to a narrow border along the costal margin, a slight clouding 

 at apex, and a thin line along the termen. 



Alar expanse, 35-50 mm. 



Genitalia (fig. 40) essentially like those of 'prodenialis except that 

 the ductus bursae is normally stouter. 



Types.— 1\\ British Museum {dentnta) ; in United States National 

 Museum {doddalis). 



Type localities. — Clear Creek Canyon, Colo, {dentata) : Mesilla 

 Park, N. Mex. (doddalis). 



Food plants. — Opuntia {Platypuntia) spp. 



Distiihution. — ^United States : Colorado.^ Glenwood Springs (July, 

 Aug., Sept.), Foil Collins, Denver, Rocky Ford (Sept.) ; Utah., Buck- 

 skin Valley (Iron Countj', June, July), Eureka (Aug.), Dividend 

 (Aug., Sept.) : Kaiisas. Manhattan (Sept.) ; Arizona^ Mormon Lake 

 (July), Douglas (Aug., Sept.), Oracle (Sept.), Globe (Sept.), Quijo- 

 toa Mountains (Oct.), Chiricahua Mountains; New Mexico., Mesilla 

 Park (Sept.), Silver City (Sept.), Julimes (Sept., Oct.), Jemez 

 Springs (July, Aug., Sept.) ; Texas., Uvalde (Sept., Oct., Nov.), Hen- 

 rietta (Oct.), Trent (Oct.), Rock Springs, Laredo (Sept.), Shafter 

 (Sept.), x\lbany. Panhandle (Aug.). Mexico: Chihuahua City, 

 Morelia (Oct.). 



One hundred and forty specimens examined. 



Remarks. — In his description of doddalis.^ Dyar pointed out a num- 

 ber of supposed differences in genitalic and palpal structure between 

 his species and dentata. These differences are entirely imaginary. 

 There is not a structural character separating the two forms. There 

 are some slight color differences between specimens from Colorado and 

 specimens from Texas, Arizona, and New Mexico. The latter seem to 

 have a slightly denser dusting of white scales on the fore wing and 



