fOL. xii 



PROCEEDINGS OF THE NATIONAL MUSEUM. 475 



By this course tolerably compact groups are formed, all easily united 

 under one generic term, and all confusing or exceptional material is ex- 

 cluded. By the order of groups adopted, the species follow naturally 

 the species classed as Orthoses, and as naturally lead to Perigrapha 

 though, perhaps, the opposite method of cataloguing would be more 

 natural. 



The species belonging to group furfurata agree not only in wing 

 form but in the genital structure. The harpes are broad, suddenly bent 

 and narrowed near the tip, which is somewhat dilated, lappet-like, and 

 fringed with spinules. The angle formed by the bend is usually pro- 

 duced or acute. The species referable to this group are separable as 

 follows: 

 Vestiture entirely hairy. 



Luteous, irrorate with blackish ; no median shade furfurata 



Vestiture, with scales intermixed. 



Dark red brown fkrbrunnea 



More reddish; heavily black marked, orbicular distinct peredia 



Dark mouse gray ; all the maculation obsolete, orbicular wanting uniformis 



There is little danger of mistaking these species, and further distinc- 

 tions here seem unnecessary. 



Group rufula contains species less closely allied in genital structure 

 than those of the preceding group, but resembling each other so closely 

 in habitus that their relationship is obvious. It joins naturally to the 

 preceding as the table shows. 



Vestiture flattened hair, front not evenly clothed. 



Median lines narrow, dark, barely visible COLUMBIA 



Vestiture hairy. 



Median lines very distinct, pale, even ; t. a. very oblique. 



Rather deep luteous gray modifica 



Very pale yellow consopita 



Median Hues interrupted, punctiform rufula 



Columbia is at once distinct by the vestiture ; it has also an incon- 

 spicuous tuft on abdomen, and reverts to the Mamestra type. 



Modifica and consopita are probably races of one species. The macu- 

 lation is alike, and only the difference in ground color separates them. 

 As no male of consopita is available for examination, a final conclusion 

 can not be reached. 



Rufula is easily recognized. Mr. Grote has named perforata, what 

 is probably a color variety of this species, and which is again referred 

 to hereafter. 



Group oviduca contains but two species 5 the type of the group, and 

 utabensis, readily distinguishable as follows : 

 S. t. line subobsolete, pectinations of male antennae short. 



Reniform inferiorly black filled UTAHENSIS 



S. t. line very distinct, pale; pectinations of male antennas longer oviduca 



Though there is no remarkable agreement in genital structure among 

 the species in the two last preceding and the following groups, yet it 

 is worthy of note that there is everywhere, though not in each species, 



