178 nWCEEDINGS OF THE NATIONAL MUSEUM. 



usual ill tli(^ Noctiiids, bul coinpjiratively sinallor and witli slioiter tar- 

 Kal joints, of vviii(5li tluit at base is somowliat eiilarj^cd, csj)(H',ially on the 

 forcleji's. 



Abdomen robust, eonie in the male and only a. little oxeeodinf? the 

 hind anj^le of tlie- seeondari(^H; ninc-h hi^avier and more eylindiieal in 

 the female, and (juite eonsiderably exceeding the anal angle of the 

 8eeondari(^a. No tnftings exeept the usual loose bunching at the sides 

 of tlie segments in the male. 



Primaries ratlier short and narrow, trigonate, outer margin obli(|U(', 

 aipex a little produced. Venation in both wings of tlie normal Noctuid 

 tyi)e and not in any way different from Aeronyvia. 



'V\\\a genus is w«ill distinguished from its allies, not only in the gen- 

 eral habitus but in the shortly pectinated antennae of the male. In 

 this character it resembles llarrmmenna, while totally distinct in all 

 other I'espects. 



There aie three rather unsatisfactory 8])ecies, of which spinca and 

 iupini wore described by Mr. Grote, Jind nraina is here (irst named. 



()fspine(( 1 have seen the tyi)es only; of Iupini I have had numerous 

 si)e(;imens which, while- greatly varying in certain directions, never 

 (piite reached the former type. 



^Kpinra. has a very evident angulated median shade line; the other 

 nu^dian lines are obscured and the ordinary spots are wanting or but 

 feebly indicated. 



Ijiipitii is a. much better marked species, with the median lines and 

 ordinary spots well develojjcd and the median shade line obscur(i or at 

 least not prominent. This is a somewhat variable (juaMtity, how(n'er, 

 and the sharply delined orbicular and somewhat smudgy reniform are 

 much more constant factors. Both species are Californian. 



Uraina is a smaller species, nu)re hairy in api)earance, the primaries 

 very evenly si)rinkled with white and black scales, so as to give a 

 powdery ashy gray appearanct^ in which all the markings are sunken, 

 though traceable. The species is allogetluM- slighter, especially in the 

 female, in which the abdomen is neitlu^r so long nor so clumsy. It 

 occurs in the mountainous regions of Colorado. 



The sexintl characters of the male an^ essentially those of group 

 anrivotiKi, the harpes oblong, sonuiwhat acutely rounded at the tip, the 

 clasi)er essentially a long, curved hook set on an ol)li(iuo ridge, which 

 may or may not form an inferior process. 



In tabular form the species divide as follows: 



ANALYTICAL KKY TO SI'KCIKS OK IMKItOI.ONCUK. 



Mtnliiin sh;i(l(< linr (list iiict, :iiij;ul.'ito(l, roniiinj; tlio most piomiiiuiit loaliiro of tlio 



priiniirii's; ortliiiiuy wpotH olisoh^to sjiiiua. 



MtidiiiM nIijkIo liIl«^ Hiilioidiiiati* or \v:inliii^; ordinary spots prcsnil. 



Ii(<sH powilcry ; all tlio onliiiar.v inarkiiif^s I'airly »<vult^iit; witlia vagiioyollowisli 



iinj;n liipitii. 



DtMiscly iiowdorcd, ohHCMiriiijr Uio ordinary markings; total iniproasion a bluish 

 ash gray vmina. 



