Rocky Mountains, 3 



biting under stones and dried bison's dung. They have a for- 

 midable appearance, and run actively. They belong to the 

 class Arachnides, genus Galeodes, which has been heretofore 

 observed only in warm climates; not one was known to in- 

 habit this continent.* 



About the sandstone ledges we collected a geraniumf in- 

 termediate between the crane's bill and herb robert, the 

 beautiful calochortus,- [C. elegans^ Ph.] and a few other va- 

 luable plants. 



The Platte at the foot of the mountains is twenty-five 

 yards wide, having an average depth of about three feet; its 

 water clear and cool, and its current rapid. Its descent for 

 twenty miles below cannot be less than eight feet per mile. 

 Its valley is narrow and serpentine, bounded by steep and 

 elevated hills, embosoming innumerable little lawns often of 

 a semicircular form, ornamented by the narrow margin of 

 shrubbery along the Platte. 



The narrow valley, which intervenes between the ridges 



* Genus Gaieodes, Oliv. 



1. G.paUipes. Say. Hairy; mandibles horizontal; fingers regularly ar- 

 quated; abdomen subdepressed, livid. 



Description. Body, pale yellowisb brown, hairy.yeef, paler; whitish, 

 first pair smallest, fourth pair largest, and longest; abdomen, livid, hairy, 

 subdep^es^ed; palpi, more robust than the three anterior pairs of legs, of 

 subequal diameter, but rather thicker towards the tip, more hairy than 

 the feet; pyes and tubercfe blackish; mandibles, dilated with numerous rigid 

 setoe; and with parallel setae projected over the fingers; Jiiii^ers, regularly 

 arquated, reddish brown at tip, and with a reddish brown line above and 

 beneath; within armed with many robust teeth; thorax, with a deep sinus 

 at the anterior angles. 



5. G. subulatn, hairy; mandibles, horizontal; thumb nearly rectilinear; 

 destitude of teeth. 



This species has the strongest resemblance to the preceding, both in 

 form, maguitnte, and colouring, but the superior finger of the mandibles 

 is unarmed and rectilinear, or very slightly flexuous; the inferior finger is 

 arquated, with about two robust teeth. 



f G. coespitose, sub-erect, pubescent, sparingly branched above. Ra- 

 dical leaves reniform deeply 5-7 cleft. The flower is a little larger than 

 that of G. robertianum, and similarly coloured, having whiti-h lines to- 

 wards the base of the corrolla We also saw here the Campanula decipi- 

 ens. Pers. L>simac!iia ciliala, Ph. Troximon glaucum, A", with two or 

 three belonging to genera with which we were unacquainted. 



