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APPENDIX. 
THE BUSH RAT. 
Neotoma floridana — Say & Ord. 
This species also occurs, and comes about the houses like the 
others, but the two do not seem to get along well together. 
THE WHITE-FOOTED OR WOOD-MOUSE. 
Hesperomys leucopus var. sonoriensis — Coues. 
A common species of general distribution in the West. 
THE MEADOW MOUSE. 
Arvicola ? 
A large species, and resembling Arvicola riparius , if not the 
same. 
THE MUSKRAT. 
Fiber zibethicus — Cuv. 
Very abundant in suitable places in Colorado. 
Family ZAPODIDzE. 
THE JUMPING MOUSE. 
Zapus i-iudsonius — Coues. 
One specimen captured near Boulder. 
Family SACCOMYID^E. 
THE KANGAROO MOUSE. 
Dipopomys ordi — Woodh. 
One specimen taken near Denver. 
Family GEOMYID^E. 
THE POCKET GOPHER. 
Geomys bursarius — Rich. 
One specimen. The species is said to be abundant on the 
plains and adjoining foot-hills. 
Family CASTORIDHS. 
THE BEAVER. 
Castor fiber var. canadensis — Coues & Yarrow. 
A group of several individuals, with specimen of large stump 
