42 THE CANADIAN ENTOMOLOGIST. 



dentate in others, and in a few erose. The discal spot on primaries 

 black, much more distinct than in either Scuddcri ox pclidiic. In some 

 few specimens the spot is centered with a few yellowish scales, the spot 

 on secondaries about the same as in Scudderi. Under side of primaries 

 yellow, paler along the inner margin, thickly dusted with dark scales over 

 costal two-thirds from base to just within the line where the inner 

 margin of the black border of the upper surface shows through ; discal 

 mark faint — scarcely discernible in many specimens. Secondaries thickly 

 dusted with dark scales over the basal three-quarters, discal spot 

 prominent, dark brown ring, centre silvered or white, more or less covered 

 with roseate scales; costa and fringes, except at inner angle of primaries, 

 roseate. Antennae roseate ; club roseate below, brown above ; collar, 

 head, legs, and a spot at base of secondaries, roseate ; palpi roseate 

 above, yellow beneath ; thorax and abdomen dark above, covered with 

 yellow hairs, yellow beneath. 



Female, expanse if^ to i^ inches ; greenish-yellow or white, about 

 evenly divided. Border well marked, varying greatly in extent. In some 

 specimens, on the primaries it is broad, and entirely encloses a row of 

 spots of the ground colour ; in others, while equally broad, it is uniformly 

 dark; from these there are all gradations down to one in which the black 

 is restricted to the apical region, and to pear-shaped spots at the ends of 

 the veins. On the secondaries the border is usually well marked, and 

 extends in some almost to anal angle ; in some examples, however, it is 

 confined to the outer angle, as three or four blotches. The upper surface 

 is less dusted with dark scales than in the male, the under surface about 

 the same, the discal spots, fringes and other characters as in the male. 



Described from 15 males and 7 females — three of which are yellow, 

 three white, and one intermediate — taken in Yellowstone National Park, 

 and at Arangie, Idaho, in July. 



Mr. Bean, in Canadian Entomologist, Vol. XXII., p. 127, men- 

 tions specimens of a Colias intermediate between Scudderi and pelidne, 

 and it is probable that this is the same, but as I have none of his material, 

 and he gives no description of it, I am not certain, 



Thytnelicus Edwardsii, n. sp. 



Upper surface bright golden-yellow, fringe dark brown within, lighter 

 outwardly. Beneath primaries yellowish, except inner margin, which is 

 shaded with black ; hind wings yellow over the anal margin for one- 

 third the width of the wing, rest grayish-yellow. 



Type. — One male, taken near Denver, Colorado. 



