333 



outer margin. In some specimens a pale t. p. line is visible, and in one case the 

 renifonn is indicated. Secondaries white, with a yellowish tinge, immaculate. 



Expands 21-24'""'; 0.84-0.96 inch. 



fi'a&i/rt/.— Argus Mountains, April, 1891 (Death Valley Exj).) ; Western Utah,\Veidt. 



I have seen 8 specimens, of wliicli tlie one collected by Mr. Weidt 

 is in the Nenmoegen collection, the others from the U. S. National 

 Mnsenm. The species is so nearly immaculate that it is easy to describe 

 it. There is, i)erhaps, a question as to the correctness of the generic 

 reference, but the species agrees fairly well with the description of the 

 genus, and has the shape, though not the color, of the European forms. 

 The eyes are small, naked, round, and hardly retracted, though not 

 prominent ; the palpi are moderate, reaching to the middle of the front ; 

 terminal joint obtuse. Front Avith a prominent, navel-shaped protu- 

 berance. Thoracic vestiture hairy, loose, hardly divergent, forming no 

 tufts. Primaries vshort, the costal margin somewhat depressed, the apex 

 a little acute, outer margin oblique, a little convex, the fringes long. 

 The legs are short and stout, clothed with rather long and fine vesti- 

 ture, tibiic not spinose, the anterior unarmed at tip. 



Pleonectyptera finitima, n. sp. — Ground color varies from gray to fawn hrown. 

 Head and thorax immaculate. Basal line wanting. Median lines marked at their 

 inception on the costaby black triangular spots; t. a. line upright, even, consisting 

 of a hrown outer and a yellowish inner shading, the latter sometimes wanting, and 

 the entire line sometimes reduced to a few dark scales; t. p. line yellowish, with a 

 narrow, dark hrown inner shading, which is sometimes wanting and sometimes 

 punctiform; as a whole the line is evenly and not stronglj^ hisinuate and only a lit- 

 tle oblique inwardl3^ S. t. line irregular, very slightly paler, almost obsolete in 

 some cases, preceded by dots or distinct blackish shades in others. Claviform and 

 orbicular wanting. Reniform of good size, kidney shaped, black in most of the 

 specimens, in one case almost obsolete. Secondaries soiled luteous, with a reddish- 

 brown tinge, which intensifies outwardly. Beneath, reddish brown, powdery, the 

 primaries with a discal lunule more or less evident, and occasionally the mark- 

 ings of the upper side faintly rej)roduced; the secondaries sometimes have an outer 

 line and discal spot, but are as often immaculate. 



Expands 22-23''^'» ; 0.88-0.92 inch. 



Habitat. — Argus Mountains, April, 1891; Los Angeles, Cal., in October. 



Four specimens are before me, but I have seen a number of others. 

 Three of them are from the Argus Mountains. The species of Pleonec- 

 typtera are extremely variable in many cases, and this species is no ex- 

 ception. I would not be much surprised if forms entirely immaculate 

 occurred. There are several undescribed species referable to this 

 genus, and I would not have named this at present were it not desir- 

 able to make the list of species taken as comi)lete as possible. 



. AxTAPLAGA KOEBELEi Riley, n. sp.*(Fig. 46, 5). — Average expanse 22-25'""^ Ground 

 color, silvery-white ; markings ochraceous. Head Avith the ocherous scales predomi- 

 nating; frontal depression with a central conic elevation which extends well 

 beyond the rim. Thorax with a broad ochraceous median band on the collar ; brown 

 behind the collar, and with a brown discal line extending to the base; patagium 

 margined with ocherous: Primaries with the silvery-white broken only by the ordi- 



*This species is described by me in this connection, because it was included in Mr. 

 Smith's photograph. — C. V. R. 



23123— :N'o. 5 4 



