694 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



ordinarily regard as specific, but neither do the pupse or adults reared 

 from the two plants differ appreciably." — Fackard, I. c. 



Acrobasis tricolorella, n. s. 



i. Fore wings blackish, shaded with whitish-gray on terminal space 

 outwardly, on costal region, over the fused discal points, and on basal 

 space. A broad white band before the anterior line. Below median 

 vein, this band is edged outwardly by a dusky shade-line, and this is 

 followed by a yellow-red shade before the outwardly oblique black ante- 

 rior line. Outer line followed by a whitish shade, roundedly indented 

 below costa, followed by the blackish ground- color in terminal space, 

 and this by the whitish-gray terminal shading. A dotted, terminal, 

 black line ; fringes pale. Secondaries pale fuscous, with paler fringes. 

 Beneath, fore wings dark; hind wings shining pale fuscous. Expanse, 

 20 mil. Two male specimens collected by Mr. Charles Fish, Oldtown, 

 Me. I have not been able to examine the neuration, but the antennal 

 structure leaves no doubt of the genus. 



The genus Acrohasis is treated by Heineman as a subdivision of Mye- 

 lois. 



Pempelia Huhn. 



Fore wings 11-veined ; 4 and 5 from a short stalk. Hind wings 

 8- veined j 4 and 5 from a common stalk beyond the extremity of the cell, 

 and appearing as the continuation of the cross-vein. 

 The median vein throws off 2 and 3 5 the stalk of 4 

 and 5 runs near 3, but only touches it at a single 

 point, sweeping by it, and becoming the concave 

 cross-vein which on the upper side returns to form a 

 prolongation to vein 6. In Acrobasis ruhrifasciella, 3, 

 4, and 5 are exceedingly close at base; the cross-vein 

 vanishes centrally; here it is completely indicated. 

 Tig.s. Neuration of hind wings resembling Catastia. 



The male antennae are bent at base with a scale-ridge. The maxillary 

 palpi are concealed by the ascending labial palpi, and terminate in a tuft 

 of testaceous hair. In the female, this tuft is wanting, and the antennae 

 are simple. 



This form differs from Pempelia as defined by Heineman by the hind 

 wings being 8-veined, and in that 4 and 5 of the primaries spring from 

 a common stalk ; from Salebria also by the latter character. 



Pempelia pravella, n. s., fig. 8 (neuration). 



(J 9 . Blackish and gray, resembling Acrobasis rubrifasciella in orna- 

 mentation. Base of primaries whitish-gray ; no raised scales. Anterior 

 line blackish, diffuse, consisting of two outwardly oblique, slightly 

 waved lines, usually coalesced, but allowing sometimes the narrow gray 

 space between them to be seen. Median field gray ; two superposed 



