388 GEOLOGICAL SURVEY OF THE TERRITORIES. 



aud Hyallela inermis, Smith, both of which were described in the Eeport 

 for 1873, which inhabited the above springs in great abundance. From 

 the pond mentioned between camps E and F a small crab was brought 

 home, which Prof. S. I. Smith pronounced to be a true marine form, be- 

 longing to the Astacidoce. That this is a survivor of the period, probably 

 comparatively recent, when this pond was a salt-water marsh, is sup- 

 ported by the astonishing fact that two specimens of a young Trun- 

 catella aud well-preserved fragments of an Area were found on the 

 muddy shores. It would be of great interest to know whether the 

 exuberant vegetation of the pond retains any traces of .marine plants. 



The insects were not methodically collected, and but few, chiefly my- 

 riapods, which are very abundant in the mountains, were brought home. 

 A small collection of spiders consists of ten species of Arane^ {Bras- 

 sidcE 2, Lycosa 5, Attus 1, Thomisns 2) and four species of Phalanges 

 {PhalangeinS, Gonyleptes 1). All of these species are believed by Mr. 

 E. H. Eraerton, who has examined them, to be undescribed, though in 

 part identical with forms previously collected in Colorado. A descrip- 

 tion is not attempted herewith, because the material is not at hand for 

 proper study and comparison. Further collections and observation in 

 this branch of entomology are particularly desirable from the mountain- 

 ous regions of all the Territories. 



Land and fresh-water shells comprise the largest part of the material 

 brought home. They were made a specialty ; and the fact that next to 

 nothing of this class had ever been reported from Colorado, and but lit- 

 tle was known at all of the Mollnsca of the Eocky Mountain region, was 

 deemed a sufficient excuse for what might seem too exclusive attention 

 to this department of natural history, which does not present to the 

 careless mind such striking attractions as the study of the higher ver- 

 tebrates. 



No fishes were collected, although numerous attempts were made. 

 The majority of our time was spent where they seemed to be entirely 

 absent, or so extremely scarce that, although all were interested in the 

 capture of certain species, not a trout graced our table during the 

 whole trip. 



Some snakes and frogs were secured at Hot Springs, Middle Park, 

 and a number of AmMystoma seen for the first and last time. Eeptiles 

 were taken wherever they occurred after this, also, except upon the 

 long side-trip mentioned above, where it was impracticable to preserve 

 anything greater than could be put in a pocket-bottle of alcohol. The 

 marsh between the Animas and La Plata was a fine locality for batra- 

 cbians. South of the mountains, lizards began to appear in great num- 

 bers and variety, and increased as we got farther out upon the dry 

 plains. Camp 20 furnished us our only rattlesnake, and I do not 

 remember any other camp at which we were even suspicious of their 

 presence. 



Such large suites had already been secured of the mammals and birds 

 of Colorado that it was not deemed advisable to spend time in a syste- 

 matic collection of them. Some skins were obtained, and observations 

 recorded, but little worthy of special mention. Birds were nowhere 

 seen so abundantly as in Berthoud Pass and on the Arkansas. below 

 Granite. The former locality, being easily accessible, ought, before 

 many seasons, to yield a rich ornithological harvest. 



In conclusion, I wish to express to Mr. Wm. H. Jackson, director of 

 our party, the appreciation I have of his hearty co-operation and genial 

 sympathy, through which he not only afforded me opportunities I would 

 not otherwise have had, but added immensely to my personal enjoy- 

 ment of this delightful trip. 



