the Big Muddy, June 28. On July 8, at the head of Heart River, 

 also on the prairie, thirteen males were taken, most of them in a tol- 

 erably fresh condition. 



8. Argynnis Edwardsii Reak. Four males of tliis species, 

 either fresh or very nearly fresh, were taken June 26, at Heart River 

 Crossing, near the tiuiber in the valley of the river. The seasons of 

 these two species are therefore nearly identical. 



9. Phyciodes Tharos (Diury) Kirb. About thirty speci- 

 mens of this butterfly were taken at He:u-t River Crossing, June 26, 

 the two sexes in nearly equal numbei-s; fiesh, passable and badly 

 bruised individuals were divided about equally among males and 

 females. 



10. Charidryas Ismeria (Boisd.-LeC.) Scudd. Only taken 

 on the Yellowstone, among the sage brush in the valley, July 18; six 

 males and two females were captured; a single male in pretty good 

 condition, the others, as well as the females, dull, rubbed and frayed. 

 Probably, therefore, it appears in June. 



RURALES. 



11. Lycseides Anna (Edw.). This butterfly was found in 

 considerable abundance, and in nearly all the localities in which col- 

 lections were made, viz.: at Heart River Crossing, the banks of the 

 Yellowstone, and at the crossing of the Big Muddy, from June 26 to 

 July 18. At the earliest date, twenty-one males were taken, of 

 which six were fresh and bright, twelve tolerably fresh, and three 

 badly rubbed; while of the six females taken at the same time, four 

 were perfectly, and two tolerably, firesh. Two days later, one fresh 

 and one rubbed male and two rather fresh females were taken; while 

 the single female captured July 18 was badly rubbed and torn. The 

 butterfly probably made its appearance this year at or shortly after 

 the middle of June. 



12. Agriades Minnehaha nov. sp. Upper surface of male 

 dark violet; the outer margin dark brown, extending more broadly 

 on the front than on the hind wings; upper surface of male rather 

 dark brown, the basal half dusted, not very conspicuously, with blue 

 scales ; both se.xes have a small black bar crossing the cell of all the 

 wings, larger in the female than in the male; outer margin edged 

 with black, followed interiorly on the hind wings by a line of white 

 scales, upon which are seated small, blackish, interspaceal spots, sur- 



