107 



band broader than in On. Dayi ; fringes yellowish, with a dusky line, whitish 

 at tips. Beneath yellowish, with terminal black bands which, on the fore 

 wings, are not removed ^superiorly from the margin as in On. Dayi ; minute 

 discal dots. 



Expanse, 32 m. m. Habitat, Colorado Territory (No. 18, coll. 

 Theo. L. Mead). 



This beaiitiful species is very distinct from Oncocnemis Dayi in 

 the ornamentation of the primaries, which latter have more the 

 appearance of those of the European 0. diffusa (H.-S. figs. 44-45). 

 Our species at once differ by their distinctly yellow hind wings. 

 The geographical distribution of the genus is very interesting, 

 since it increases the zoological homogeneity of the present Arcto- 

 gaeal province. The ocelli are present in all our species, and the 

 maxillae long, stout, black and corneous. 



I respectfully dedicate our second species of the genus to Doctor 

 George E. Hayes, Vice-President of this Society, whose observa- 

 tions on the Geology of Buffalo, have materially increased our 

 knowledge of our locality. 



Oncocnemis Cliandleri, Orote, Plate 3, fig. 9. 



^ . — Eyes naked, strongly lashed ; all the tibiae without, all the tarsi with 

 spines ; fore tibiae with a strong claw. Fore wings gray, mixed black and 

 white, distinctly contrasted and with longitudinal black streaks, resembling 

 in this respect On. Dayi. A distinct black dash runs from the base of the 

 primaries to the long, black-margined claviform. Transverse lines indicated on 

 costal region, else obsolete. The appearance of the gray ordinary spots is 

 very peculiar ; they are fused by a common black edge and distinct shaded 

 fillings. The compound spot assumes a decumbent funnel-shape. Very evi- 

 dent longitudinal black dashes precede the white dentate subterminal iine 

 interspaceally. Fringes alternately paler and darker. In the ornamentation 

 of the primaries this species remind us of Cloantha. The terminal space is 

 dark and concolorous in On. Chaifdleri, whereas it is paler than the sub- 

 terminal in On. Dayi. Hind wings pale fuscous or smoky, with a diffusely 

 margined, wide, blackish hind border, which, in one specimen, does not con- 

 trast greatly with the rest of the wing. Beneath paler than above, with 

 terminal blackish borders and minute discal points. 



Expanse, 32 m. m. Habitat, Colorado Territory (coll. Theo. L. 

 Mead, No. 27). 



Quite distinct from the species with yellow hind wings, this 

 resembles On. Davi. rather than On. Ilavosi, in tlie oruamenta- 



