164 



BRITISH BUTTERFLIES. 



tinged distinctly with buff ; distinct blackish patches at the 

 base of the median interspaces on the upper surface of the 

 forewings . . . . . . . . . . . . . . . . juba. 



5. A rather small species ; markings on the under surf ace of the 



forewings, below the middle median nervure, generally well- 

 defined, at least above ; hindwings with a scarcely perceptible 

 fulness to the outer margin next the inner border ; band of 

 undersurface of same wings moderately broad, often broken ; 

 inner area of same surface slightly paler than the rest, but 

 scarcely tinged with buff, faint, dusky patches at the base of 

 the median interspaces or the upper surface of forewings ; or, 

 usually, these parts are no darker than the surrounding field . nevada. 

 6. Mesial band of the undersurface of hindwing bent at an 

 angle of 45° or 50° ; spots of this band generally vivid, 

 approaching the outer margin of the wing so closely 

 in the interspace beyond the cell as to be removed 

 from it by less than their own width . . . . . . Colorado. 



6. Mesial band of the undersurface of the hindwings bent 

 at a right angle, or a little less than a right angle, the 

 spots generally not very vivid, separated from the 

 outer margin in the interspace beyond the cell by at 

 least their own width, and ordinarily by much more 

 than that . . . . . . . . . . . . . . 7. 



7. Spots in the interspace beyond the cell generally smaller than 

 the others which make up the mesial band of the under- 

 surface of the hindwings, giving the band an irregular ap- 

 pearance ; spots of the lower portion of the band generally 

 confluent; the V-shaped spot, traversing the cell near its 

 extremity, very seldom crossing the median nervure to the 

 medio-submedian interspace, and not enlarged there ; basal 

 half of fringe on the hindwings, as seen beneath, generally 

 not at all, or very inconspicuously, interrupted with dusky at 

 the nervure tips . . . . . . . . . . . . . . Manitoba. 



7. Spots of the mesial band on the undersurface of the hindwings 

 pretty uniform in size, those of the interspaces beyond the 

 cell seldom any smaller than the others, so the band has a 

 more regular appearance than in P. manitoba ; spots of the 

 lower portion of the band distinctly marked, sometimes even 

 independent ; the V-shaped spot traversing the cell near its 

 extremity always crossing the median nervure to the medio- 

 submedian interspace and enlarged there ; basal half of fringe 

 on the hindwings as seen beneath, generally conspicuously 

 interrupted with blackish at the nervure tips . . . . . . comma. 



Table to determine the males or the Nearctic forms of U. comma : drawn 



FROM THE ABDOMINAL APPENDAGES. 



1. Hook and lateral arms of upper organ separated by a deep cleft, 

 about half the length of the horizontal portion of the organ ; 

 hook slender, as viewed from above ; clasps not extending 

 nearly so far back as the upper organ 



1. Hook and lateral arms of upper organ separated by a slight 

 cleft, not quarter the length of the horizontal portion of the 

 organ ; hook very stout as viewed from above, clasps extend- 

 ing almost or quite as far back as the upper organ 



2. Hook and lateral arms nearly parallel, and but slightly 

 separated 



3. Clasps, when viewed exteriorly, with two conspicuous superior 

 apical teeth. . 



3. Clasps with but one conspicuous apical tooth 



4. Apical tooth of clasp equally separated from each other 

 from base to summit ; clasp itself much broader at 

 base than elsewhere, about twice as long as broad . . 



6. Apical teeth of clasp very closely approximated, often appearing 



at first sight as if single ; anterior inner edge of apical tooth 

 but little produced as a slightly and bluntly toothed lamina ; 



2. 



3. 



nevada. 



f sylvanoides 

 1 (Columbia). 



d. 



