
(D.)—Notice of the Butterflies and Orthoptera, collected by Mr. George M. 
Dawson, as Naturalist of the B. N. A. Boundary Commission. 
By Samvuet H. Scupper. 
The insects recorded in this list were taken along the boundary line between 
British America and the United States, from the Lake of the Woods, in W. long. 95°, 
to the Rocky Mountains in W. long. 115°. The principal localities referred to are :— 
Dufferin, on the Red River of the North, altitude 780’ ; Souris River, (a tributary of 
the Assineboine), between long. 99° and 102°, altitude about 1600’; and Woody 
Mountain, about long. 107°, on the watershed between the Missouri River and the 
streams flowing north, the elevation of whose plains is about 2,500’. A few specimens 
were also taken at Roseau River, lying between Red River and the Lake of the Woods; 
and flowing into the former; Wood End, on the Souris River, long. 103°, altitude 
1700’; the east fork of Milk River, which crosses the line in long. 109° 30’, at an alti- 
tude of 2700’; and West Butte, the western part of the Three Buttes, in long. 111° 
30’, altitude 4,000’. The highest elevation from which specimens were brought, was 
the summit of the Rocky Mts., in long. 115°, the altitude from 7,000’ to 8,000’. 
If we compare this list of butterflies with that of the Yellowstone Expedition 
of 1873,* we shall find some interesting and striking facts, although no great number 
of species were taken by either party. The two collecting grounds, while not 
more than one or two hundred miles apart, lay mostly in different drainage areas ; 
and if we omit from the present list the species found only at Woody Mt. and west- 
ward, as being upon the summit of the water-shed between the two river basins, and 
therefore likely to impair the value of the result, we find that out of the forty-three 
species found in the two collecting grounds, only seven were taken in both. Of the 
twenty-two Nymphales, only three occurred in both regions, viz.: Vanessa cardui, 
‘Argynnis Nevadensis and Phyciodes Tharos, the first and the last species of un- 
usually wide distribution. Of the five Rurales, none of the species were taken in both 
localities. Of the seven Papilionide, two were taken in both, Eurymus Philodice and 
E. Eurytheme ; also species of a very extended ‘range. Of the nine Urbicole, two 
were brought home by both parties: Thorybes Pylades and Thanaos Persius, the for- 
mer certainly, and the latter probably, of exceptionally wide geographical distribution. 
Of the seven species occurring in both regions, only one may be said to have a range 
at all restricted, and they are mostly such species as one might find in almost any 
part of America, east of the Rocky Mts. 
The same will be noticed, though less conspicuously, on comparing the species of 
single genera; thus Cenonympha Ampelos of the Assineboine Basin is replaced by 
C. Galactina in the Yellowstone; and- Basilarchia Arthemis of the former, by B. 
Weidemeyeri of the latter. B. Disippe was taken only on the Yellowstone, but cer- 

SE 
* See Proc, Bost, Soc, Nat, His ., xvul., 86-91, 
