180 BULLETIN 38, UNITED STATES NATIONAL MUSEUM. 



Alblpeimis is like insignata in eveimess of color aud general a])pear- 

 ance, and lias been confused with it. It is, however, smaller, and the 

 secondaries are white in the male, dusky in the female. 



tipectanda amA imllipennis h^eiXQ t]iQ> secondaries white in both sexes. 

 The former is a rather small, narrow winged form with very neat, 

 sharply defined maculation, resembling albipennis. The latter has pale 

 fuscous primaries with complete but very illy defined maculation ; it 

 is one of the characterless species which are with difficulty referred to 

 an appropriate group, and which there may be difficulty in recogniziug. 



Basalis, solitaria, and nostra difler from all the i^receding by longer 

 wings with the apices of primaries more evident. 



Basalis is a pale red brown, with the basal space gray ; the ordinary 

 spots are large and pale in color. 



Soiitaria is of much the same color, but the basal space is not pale, 

 and the ordinary spots are small and yellow ; the transverse lines gray. 



The remaining species have an evident black dash at base of prima- 

 ries. 



Ochrogaster varies from yellow to bright red brown ; the transverse 

 lines obsolete ; the i)rimaries are long and narrow, subequal, and thus 

 distiutjt from the remaining members of the series. 



Two color divisions are indicated in the balance of the species; the 

 first of various shades of brown, the costa usually paler ; the second 

 ash or darker gray, with somewhat longer primaries, apices more dis- 

 tinctly marked. 



Idahoensis is dull fuscous brown, the costal region gray ; ordinary 

 spots also gray, distinct; orbicular oblique, oblong, open superiorly. 



Fnrtivus is very like the preceding, but the orbicular is V-shaped, 

 and there is a series of distinct sagittate spots preceding the.s. t. line. 



Westermani is allied, but is more sordid in appearance ; the ordinary 

 spots not so well defined, orbicular rounded, but incompletely outlined 

 superiorly. In addition the costa is strongly convex where in idahoen- 

 sis it is straight. 



Obeliscoides has the transverse lines distinct, the costal region and 

 ordinary spots whitish ; reniforni unusually large, contrasting ; orbicular 

 complete; s. t. line narrow, paler, rather even, costa arched. 



Infellx is larger, has the costal region yellow, ferruginous, or gray j 

 orbicular round, complete; reniform not unusually large; s. t. line de- 

 fined only by the difference in color between s. t. and terminal spaces, 

 preceded by a series of sagittate bhick spots ; costa not arched. This is 

 a distressingly variable species, becoming dull black in some speci- 

 mens, without obvious maculation save the outlines of the ordinary 

 spots, and then likely to be confused with iJoMoralis, from which, how- 

 ever, it is, I believe, distinct. Other specimens become lilac shaded and 

 then resemble perexcellens. 



Islandica is also allied t« oheliscoides, but separable by the concolor- 

 ous costal region and ordmary spots. The basal space is paler. 



