Report on the Butterflies coLtECTEf) by Mr. J. A. 

 Allex ox THE Yellowstone; Expedition of 1873. 



The twenty-eight butterflies mentioned below -were brought home 

 by the Yellowstone Expedition, sent out under the cliargeof Gen. D. 

 S. Stanley, by the Secretary of War. They were collected by Mr. 

 J. A. Allen, zoologist and botanist of the expedition, and were taken 

 at four different localities, from Heart River (about ISOO feet above 

 the sea) to the mouth of Cedar Creek on the Yellowstone (about 

 2200 feet abote the sea), between June 26 and July 20. The local- 

 ities were the following : — 



1. Heart River Crossing, Daliotah Terr., about fitly miles west of 

 the Missouri River, June 26. The collections were almost wholly 

 made in the valley of the river, near or among timber. More than 

 half of the specimens brought home, and nearly three-fourths of the 

 species were taken at this place. The butterflies not foufid here 

 ■were: — Min. silvestfis, Arg. nev'adenais, Char. Ismerid, Chrys. Sirius, 

 Chrys. Helloides, Amar. Zolicaon, the two species of Erynnis and 

 Atryt. Logan. There was a large proportion of Nyniphales and 

 Urbicolae, three-fourths of the butterflies belonging to these two fami- 

 lies. 



2. " Camp No. 8," at the crossing of Big Muddy Creek, about 

 twenty miles nortliwest of the Heart River Crossing. There was 

 very little timber here, and niost, if not all, of the butterflies were 

 taken in the open country, and represent, says Mr. Allen, the usual 

 species of the prairie. The butterflies taken there were : '— Coen. 

 Galaclina, Arg. nevadensis, Lye. Anna, Chrys. Helloides, Hesp. tes- 

 sellata and Ocytes Uncas. 



3. Near the head of Heart River, about one hundred miles west 

 of the two previous localities, July 8. The butterflies were also 

 taken on the prairie, and consisted of Bas. Dlssippe, Van. cardui, 

 Arg. nevadensis, and Chrys. Helloides. 



4. Shell Point, Yellowstone River, at the mouth of Cedar Creek, 

 ten miles above the fliouth of Glendive Creek, — landmarks which 

 will doubtless be given on the next good map of this region. Th« 



