PROCEEDINQS OF THE NATIONAL MUSEUM. vol.38. 



linear, angular, often partially bordered with black. Fringe yellow 

 or brown. Secondaries more or less suffused with smoky, rather 

 heavily strigate, especially at inner margin and in outer area. Trans- 

 7erse line irregular, brown, bordered outwardly with a narrow band 

 of ground color. A row of intervenular black spots on outer margin 

 near anal angle. Discal spot absent. Fringe as in primaries. Be- 

 neath paler than above, finely strigate with brown, especially heavy 

 on secondaries. Outer line of primaries evident near costa; on sec- 

 ondaries strongly marked and sharply denticulate. Discal spot of 

 fore wings white; of hind wings large, brown and conspicuous. 



Habitat. Canadian region of the Boreal life zone extending south- 

 ward along the mountain chains in both the east and the west. 

 Specific localities: Arizona; Durango, Colorado; Washington; Vic- 

 toria, British Columbia, June 13, 20; Wellington, British Columbia, 

 June 15; Arrowhead Lake, British Columbia, June 1 to 15; Miniota, 

 Manitoba, July 21 : Winnipeg, Manitoba, June 8 to 15; Indian Valley, 

 Catskill Mountains, New York, June 7, 16, July 5,28,30; Cohasset, 

 Massachusetts, June 8, 30. 



This peculiarly mottled form is distinguished from marmoratus, 

 which it most resembles superficially, by the bright yellow or yellowish 

 ground color which has sometimes a trace of olivaceous in it. The 

 basal and median areas are not completely suffused with brown as in 

 marmoratus and in consequence the inner line shows up more promi- 

 nently. In genitalic characteristics this species is allied to Colorado 

 and in this structure both species depart widely from the others of 

 the genus. The clasper is long and narrow with the basal projection 

 also long and thumb-like in shape. The uncus as differentiated from 

 the next species is straight, and the scaphiuni hook is more slender 

 and less curved. 



PERO COLORADO, new species. 



Plate L3, figs. 8 and 9; Plate Hi. fig. s. 



Expanse, 36 to ;;s nun. Head and thorax light yellowish-brown to 

 grayish-brown, the latter sometimes with scattered whitish scales: 

 abdomen creamy yellow to yellow with occasionally a grayish cast. 

 Antenna' light yellow ; a white spot at base of each and the white 

 line crossing the superior pari of the front usually diffuse. Ground 

 color grayish-white, with or without a rusty-yellow cast, and more 

 or less besprinkled with brown scales, those of the female usually 

 profuse and forming short strigations. Inner line of primaries 

 yellowish-brown to darker brown, rather narrow and nearly always 

 complete. The scallops are defined bul not particularly bold. Outer 

 line concolorous with inner, variably sinuous, though usually not 

 \cry strongly ><>. Inner area composed of the unmodified ground 



