butterflies were obtained July 18 and 20, among the page brush of 

 the river valley, and consisted of Min. silvestris. Bus. Weidemeyeri, 

 Char. Ismeria, Lye. Anna, Col. Philodice, Amar. Zolicaon, the two 

 species of Erynnis, .ind Atryt. Logan. 



NYMPHALES. 



1. Satyr us Ridingsii Edw. A single male, rubbed, but not 

 torn, was taken in the river valley, at Heart River Ci'ossing, June 2f). 



2. Minois silvestris (Edw.). Sixteen specimens (lid", 5 9) 

 were taken on the banks of the Yellowstone River, in the sage brush, 

 July 18 and 20. About half the males were in fair condition; 

 the other half were rather rubbed and frayed; most of the females 

 were pretty fresh, but two of them were a good deal torn. Probably 

 the butterfly appears early in July. 



3. Coenonympha Galaetina (Boisd.) Morr. This species 

 was taken at Heart River Crossing, in the river valley, June 26, and 

 on the open prairie, at the crossing of the Big Muddy, June 28. The 

 males (six) were fresh or very nearly fresh; and the females (four- 

 teen) were all fresh, though some were a little torn, perhaps in cap- 

 ture. The butterfly probably appears toward the end of the month. 



4. Basilarchia Disippe (God.) Scudd. This butterfly was 

 only taken on Heart River; a male, fresh and very dark, like Flor- 

 idan specimens, was taken at the crossing in the river valley, June 

 26; and a female, very badlj' rubbed , and of the ordinary color of 

 northern specimens, near the head of the river, on the prairie, July 8. 



5. Basilarchia Weidemeyeri (Edw.) Grote. Three speci- 

 mens of this beautiful insect were taken; two males, one of theui per- 

 fect, the other pretty fresh, Avere found near timber at Heart River 

 Crossing, in the river valley, June 26; the third, a female and ragged, 

 was taken in the sage brush of the river valley, near the encamp- 

 ments on the Yellowstone, July 18. Its periods resemble, therefore, 

 those of B. Arfhemis. 



6. Vanessa cardui (Linn.) Ochs. Two males were taken, 

 one fresh, the other very badly frayed; the former on the banks of 

 the Yellowstone, July 18; the latter at Heart River Crossing, June 

 26; the latter had probably hibernated, and the former was an early 

 individual of the first brood. 



7. Argynnis nevadensis Edw. Two males and a female of 

 this butterfly, fresh, were taken on the open prairie at the crossing of 



