108 BULLETIN 38, UNITED STATES NATIONAL MUSEUM. 



Tbe genitalia of the $ in the two species of wliicli they are known 

 are after one type. The harpe is moderate in length, decreasing in 

 width to the tip, where it is obliquely truncate. At the inferior margin, 

 near the base of clasper, is a short, acute semi-corneous projection. 

 The clasper is short, stout, straight, or very feebly curved at base, 

 tapering regularly and somewhat rapidly to tip. In lagena it is longer 

 than in cloanthoules. The species are easily separated. 



Lagena is at once distinguished by the usually confluent ordinary 

 spots, combined, of a bottle shape; they are always at least approxi- 

 mate, and usually confluent. Albalis is separable by the very distinct 

 strigate maculation and strongly dentate dark terminal space. 



Cloanthoidefi is but a synonym of alhaliSj based upon a cleanly marked 

 specimen. Mr. Graef has the type of cloanthoides and both the Hulst 

 and Meske collections have specimens named albalis by Mr. Grote, and 

 agreeing with his description, which are undoubtedly the same. 



SYNOPSIS OF SPECIES. 



Collar with a black line.; ordinary spots nsnally confluent, bottle shaped., .lagena. 



Collar nnliiied ; ordinary spots faintly indicated; lon<i;itndinal strij^ose nuicnlation 



very distinct ; terminal space strongly dentate cloanthoides. 



Rhizagrotis lagena Grt. 

 1875. Grt., Can. Eut., vii, 2G, Agrotis. 



Pale yellowish gray ; veins more or less marked with black ; a black, 

 indefinite basal dash ; cell somewhat dusky fuscous, the fuscous streak 

 continued to outer margin.' Terminal space somewhat darker, deeply 

 and irregularly indented on all the veins. Transverse lines all obsolete. 

 Ordinary spots distinctly present, narrowly outlined in black, annulate 

 with white: orbicular narrow, elongate, decumbent, usually reaching 

 to and connected with the upright, lunate reniform, giving the com- 

 bined spots a bottle-shaped ai)pearance. In some specimens the spots 

 are not (juite connected, but all that I have seen have them very closely 

 approximated at least. Secondaries white; a narrow dusky line at 

 margin. Beneath powdery, white; an extra discal punctiform dusky 

 line on secondaries. 



Expands 38-40"'"' ; 1.50-1.60 inches. 



Habitat. — Arizona, Montana, Utah, California, Nevada. 



A very well-marked species allied in appearance to hollcmani, belong- 

 ing to an entirely different group. A specimen of hollemani in Mr. Neu- 

 moegen's collection is labeled lagena, by Mr. Grote. The simple male 

 anteunte will always distinguish this species from the other. 



Rhizagrotis albalis Grt. 



1H78. Grt., Bull. Geol. Snrv., iv, 175, Agrotis. 



cloanthoides Grt. 

 1880. Grt., Bnll. Geol. Snrv., vi, 153, Agrotis. 



Gray, varying in shade, veins strigate with black, median lines lost. 

 A distinct black basal dash ; cell slightly dusky, hind margin narrowly 



