BUTTERFLIES OF MONTANA. 



147 



Distribution We have not seen it in the state, nor is it in any of the 

 collections we have examined. It is reported from California, Arizona 

 and Montana. 



Genus HELIOPETES Billberg, Helopetes syrichtus, Fabricius. 

 This species is reported by Edwards among the specimens collected 

 "by Cafrlrigton and Logan in 1871. 



Genus PYRGUS. 



THE CHECKERED SKIPPER, Pyrgus montivaga Reakirt, or Hesperia 

 tessellata, Scudder. Fig. 106a. 



Fig. 10GA. Pyrgus montivaga. 



Butterfly Expanse, about 1.20 inches, 30 mm. Male: Upper sur- 

 face black, the basal third and hind margin of fore wings overlaid with 

 white hairs, as also the inner, part of the hind wings. The outer two- 

 thirds of fore wings contain about thirty white spots arranged somewhat 

 in four irregular transverse rows; and five more on the costal edge. The 

 hinds wings have about eighteen spots, arranged in three rows, the spots 

 of the inner row the largest, the middle ones crescent, the outer ones 

 points. Fringes white, with black at the ends of the veins. 



Under side of fore wings yellowish white along the costa and the 

 outer margin, the spots of the upper surface repeated, but more or less 

 blended, the space between the spots brownish black. Hind wings white, 

 faintly yellowish; a spot near the base, two irregular transverse bands, 

 and a marginal row of lunules are brownish, these corresponding to the 

 spaces between the rows of white above. 



Female Darker, owing to the spots being smaller, the marginal row 

 of points sub-obsolete. Under side also darker. 



Distribution From Pennsylvania to the Gulf of Mexico, from the 

 Atlantic to the Pacific. In the state it has been taken by Barnes at 

 Aldridge (one) ; by Elrod at Flathead lake (one) and at Swan lake (one) ; 

 Wiley has many specimens in his collection from Miles City; Coubeaux 

 has collected it in the Bear Paw Mountains. Collected by Coues along 

 the northern border in 1874. 



Genus HESPEROPSIS. 

 THE LENA SKIPPER, Hesperopsis lena, Edward. 



Butterfly Expanse, male, 1.1 inches, 28 mm., female 1.15 inches, 30 

 mm. Upper side dark brown, glossy; primaries have three small white 

 spots, with traces of a fourth, in an oblique bar from costa, at four-fifths 

 the distance from base to apex; a small spot in cell near outer end; and 

 three minute spots in median and submedian interspaces, two being in 

 the latter, these about three-fifths the distance from base to hind margin. 

 Secondaries immaculate. Fringes concolored. 



