Tryon Reakirt on Coloradian Butterflies. 151 



upon the upper half of each wing, in no place exteudingupon the wing 

 surface; forming a most excellent diagnostic. 



Palpi, white or whitish ; Expanse 1 inch. 



Hub. Rocky Mountains, Colorado Terr., (Coll. Tryon Reakirt.) 



Hesperia Kidingsii, nov. sp. 



JIab. Rocky Mountains, Colorado Terr., (Coll. Ent. Soc. Phil.) 



Female. Dark olive brown ; primaries glossed with fuscous at the 

 base and on the inner margin; a large subquadrate white spot at the 

 end of the cell; half way between this, and the apex, three small 

 spots run down from the costa; an interrupted maculate band rises 

 from the middle of the sub-median vein nearly to the outer margin, 

 the terminal spot, irregularly plano-convex, is opposite to the discal 

 one ; of the four following, the first is a truncate cone, the second ; 

 very large, and the third minute, all these are white; the fourth is 

 fuscous, and loses itself outwardly in a group of atoms of the same 

 color. 



Secondaries, have a spot within the cell, and five others between it 

 and the margin, all ochreous. 



Below, the costa of the primaries, and their inner margin are pale 

 grayish-green ; the rest of the surface olivaceous, greenish towards the 

 costa, on which the markings of above are repeated. Secondaries 

 greenish, cut with white veins; a white spot in the cell, followed by a 

 very irregularly margined baud of the same color, and nearly forming 

 a rectangle : the species between the central spot and this band, as well 

 as slightly above and below both, are olive brown ; the two interspaces 

 between the spot and the apex of the rectangle, retain the ground 

 color. Fringe whitish ; expanse 1.40 inches. 



Body black brown covered with olive brown hair; grayish brown 

 and whitish below; a collar of white hairs. 



