NORTH AMERICAN LEPIDOPTKRA. 345 



seems to be vei-y broad at base, suddenly narrowed to a rather slen- 

 der, somewhat curved process ; the whole bearing an odd resemblance 

 to a butter scoop. 



O. aqualis Grt., Papilio 1880, i, 33, Oncooiemis. 



" 5 . — Eyes naked ; fore libise with a claw. Related to chaiKJleri, but stouter. 

 Fore wings bluish white, gray over blackish; all the lines obliterate; subter- 

 miiial line wanting. The gray concolorous stigmata with difficulty perceived ; 

 all three present ; veins obsoletely marked ; a distinct series of black interspaceal 

 terminal lines or .streaks. Hind wings soiled, slightly iridescent, fringes whitisli, 

 interlined. Collar light gray, dusky behind, narrowly lined in front; head 

 blackish. Beneath paler, discal spots present; hind wings whitish, irrorate, 

 with a dotted exterior line feebly marked. Expanse 38 mm. 



" Hab. — California. 



" This Californian form differs by the black interspaceal dashes 

 not being interru{)ted by a transverse pale shade which only shows 

 in chimd/eri, where it cuts the dashes, but in var. (?) riparia broadens 

 into a whitish, diffuse, s. t. line." 



O. oblita Grt., Bull. Surv. iii, 117. 



"Fore tibiae with a short claw; fore wings hoary gray, with pale brown shades 

 on disc across the reniform and on submedian interspace. Lines obliterate. 

 Orbicular elongate, with fine white annulus. Reniform dark, narrow and lunate 

 above, below joined to a white patch on median vein, bordered with dark scales 

 above and stretching backward so that the whole spot is L-shaped. Claviforin 

 curved, very long, reaching to the t. p. line, bordered with white, wide and 

 prominent. T. p. line barely indicated by a gray shade, produced opposite the 

 cell, curved inwardly below the median vein ; subterminal line composed of 

 blackish spots in a whitish intervenular shade situated very near the margin. 

 Hind wings pale fuscous with white fringes. Thorax and head gray, being com- 

 posed of black and white scales. Abdomen pale fuscous; fore wings pointed at 

 apices, with .straight costal margin. Wings hoary beneath. Expanse 30 mil. 



" Hab. — Nevada ; from Dr. J. S. Bailey. In color and ornamen- 

 tation this species resembles the genera Morrisonia and Adinotia. 

 In its present position it comes nearest to 0. chandler!.." 



Group GRACILLIMA. 



The two species which are rather arbitrarily separated under this 

 title agree in pale gray color, obsolete median lines, very long clavi- 

 form, fused ordinary spots and very prominent subterminal shade. 

 As compared with the other species the primaries have the apices 

 somewhat produced and the species seem slighter ; they are closely 

 allied to the species of the chandleri group, differing at a glance by 

 the prominent s. t. shade as well as the somewhat produced wings. 



TE.\NS. AM. ENT. SOC. XVI. (44) AUGUST, 1889. 



