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LETTER OF TRANSMITTAL. 



Office op U. S. Geological and 

 GEoaBAPiiicAL Survey of the Territories, 



Washington, D. C, Novemlter 1, 1876. 

 Sib: I transmit liercwith a monogrnpli of the family Zajmd'uiie for pub- 

 lication 08 one of tiie series of articles on the Rodcntia of North America, 

 now in course of preparation by Mr. J. A. Allen and myself 



The present article, like others of the series, is based upon the material 

 contained in the National Museum, Smithsonian Institution, including s])cci- 

 mcns collected by yourself or under your direction. It is republished-, with 

 much modification, from the Bulletin of the Survey, second- series, No. 5, 

 pp. 253-262. 



I am, Sir, &c., 



ELLIOTT COUES, 

 Asut. Surg. U. 8. A.y Secretary of the Survry. 

 Pr.f. F. V. Hayden, 



United States Geologist-in-charge. 



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