REVISION or SI'ECIIOS OF THE GENUS AGROTIS. 107 



Rhizagrotis albicosta Sinith. 

 1887. Smith, Proc. U. S. Nut. Miis,, x, 454, Agrotis. 



Very dark, smoky brown ; cell, except orditiary .si)ot.s and a ba.sal dasli, 

 black; costal space and ordinary spots reddish clay yellow. xVU the 

 veins more or less evidently marked. T, a. line very faintly indi- 

 cated between median and s. u\. vein, else obsolete ; t. p. line wantinjr; 

 s t. line indicated oidy by a few indefinite black marks ()pi)osite the 

 cell. Orbicidiir ronnd, small, with a i)nnctiform dark center, lleniform 

 normal, annulate with somewhat paler yellow. Secondaries pearly 

 white, with smoky outer border. Beneath, i>rimaries blackish, second- 

 aries pearly white. Thorax concolorous with i)rimaries, with a some- 

 what purplish tint. 



Expands, 32-42"""; 1.25-1. OS inches. 



IlAiu TyVT. — New Mexico, Arizona, Colorado foot-hills. 



This neatly marked species is very easily recofjnized by the obsolete 

 transverse lines and the i)early white secondaries. 



The Colorado specimens, collected by ]\Ir. Bruce, are distiiu;tly larj^^er 

 and brighter in color, the strigation less evident. The lines are all 

 traceable, liut not evident. The habitus remains the same and the 

 geneiic characters, once recognized, the specifi<! reference is certain. 



Rhizagrotis apicalis Grt. 



1880. Grt., Bull. Gool. Snrv., vi, 153, AgroiU. 



Almost uniform luteous brown, veins marked with black ; a blackish 

 shade frou) reniform along costa to apex. Transverse lines ap[)roxi- 

 male, narrow, black, even. T. a. upright. T. p. ungulate over the cell. 

 S. t. line obsolete. Ordinary spots very faintly defined, concolorous, 

 complete, normal. Two longitudinal dark lines opposite cell from t. p. 

 line to margin. Secoiularics smoky ; at base paler. Beneath powdery, 

 primaries smoky, secondaries paler. Uead and thorax concolorous with 

 l)rinuiries. 



Expands. 32"'""; 1.25 inches. 



llAunAT — Colorado, New Mexico. 



This is one of the most simply marked and most easily recognizalde 

 of our sj)ecies of '■'Agrotis,''^ but it does not seem to be one of the most 

 common. 



Group CLOANTHOIDES. 



Anterior tibia^ moderately spinose, not so heavily armed at tip. 

 Fi'ont full, rather broad, rough, granulate, hardly tuberculate. An- 

 teniiie (J simi»le, ciliate. Thorax untufted, or at most with an indefinite 

 basal tuft. The primaries are moderate, apices rectangular, slightly 

 produced ; the colors are gray and black ; transverse maculation obso- 

 lete, replaced by longitudinal strigate uiarkings. -Ordinary spots either 

 more or less contluent or obscured by the strigjB. 



