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which could not be distinguished from European examples, 
yet that a number of specimens together could be certainly 
recognized as having come from either America or Europe. 
Among the butterflies from the Yellowstone Park, the 
rarest and most interesting was Erebia haydeni, which has 
been recently figured in Edwards’ ‘ Butterflies of North 
America,’ but which, in Mr. Elwes’ opinion, probably belongs 
to the genus Cenonympha, and is most nearly allied to 
C. Nolckeni from Turkestan, whilst there is no species of 
Erebia in any part of the world to which it has any outward 
resemblance. 
Mr. Elwes further stated that Thecla spinetorum, a species 
described from California, but hardly known in any American 
collections, was also found very abundant in glades in the 
forest in the Upper Geyser basin of the Yellowstone Park. In 
the same place was taken Pieris occidentalis, which is hardly 
separable from the Alpine and Himalayan Pieris callidice; also 
a form, called oleracea, of Pieris napi, which varies in such a 
wonderful manner in North America, and has been the subject 
of an excellent monograph by Mr. W. H. Edwards in “ Papilio.” 
Mr. Elwes remarked that Chionobas uhleri, C. chryaus, 
Erebia epipsodea, Argynnis eurynome, helena, and freja were 
other Alpine forms taken in the National Park, the latter so 
nearly identical with Scandinavian specimens, that it would 
be hardly possible to separate them. He said that not less 
than forty species of butterflies were taken in the four or 
five days, or parts of days, on which the weather, and the 
wonderful scenes of interest with which the Park abounds, 
allowed collecting to be prosecuted; and as the season was 
only then beginning, he thought it probable that a diligent 
collector would reap a very rich harvest during the latter half 
of June and July. The elevation being considerable, and 
the climate very cold in winter and sunny in summer, whilst 
no cattle are allowed to graze in the Park, all the conditions 
for an abundant harvest of insects were present; and though 
the flora has much of an alpine character, yet the variety of 
herbaceous plants is very great. 
In conclusion, Mr. Elwes said that a branch line from the 
Northern Pacific Railway made the Park very easy of access, 
