Acrobasis vaccinii, n. s.—General color and appearance of A. indiginella Zell. (nebulo Walsh) but a somewhat smaller species, with primaries usually narrower. It may be distinguished by the following differences as compared with indiginella:

Average expanse, 15 mm. Colors of a colder gray with less reddishbrown or tawny on the inner portions of primaries, and with the pale costal parts nearly pure white, so as to contrast more fully with the dark shades, and to more fully relieve the basal branch of the forked shade on inner part of first or basal line, this basal branch being also usually darker than the outer or posterior branch. The triangular costal patch from the basal line is obsolete. The transverse pale lines are less clearly defined and the terminal is nearer the posterior border of the wing, i. e., the median field is wider. The geminate discal dots are always well separated and the inner one well relieved by the white which extends around it on the darker ground and often forms an annulus. The oblique shade from apex is less clearly defined.