INTRODUCTORY NOTES. 515 



available, and his collections, as well as those of others, have added largely 

 to the number of specimens secured. 



The first party, in charge of Dr. J. T. Rothrock, operated in New 

 Mexico and Arizona, proceeding as far south as old Fort Crittenden, near 

 the Mexican boundary line ; the second, in charge of the writer, in New 

 Mexico and Colorado ; -and Mr. Aiken's work was for the most part per- 

 formed in the same regions. 



Of serpents, the most characteristic of Arizona and New Mexico were 

 found to be the different species of Crotatida?, Eutcenia cyrtopsis, E. mar- 

 ciana, E. ornata, and Heterodon nasicus. In Southern Arizona, Mr. Henshaw 

 was fortunate enough to discover a serpent for which Prof. E. D. Cope has 

 erected a new genus, calling it Cliilopoma rufipunctatmn. In Rock Creek 

 Canon, Arizona, an extremely rare turtle was secured, Cinosternum henrici, 

 LeConte, which was taken upon the hook of a fishing line. Of lizards, the 

 usual variety of species was obtained, no new ones being discovered. 



In Colorado, serpents were not so numerous, although lizards and frogs 

 abounded ; Eidcenia vagrans, P'dyopliis sayi var. ~bdlona, and Bascanium 

 flaviventre being common. At the Hot Springs, Pagosa, Colo., P. sayi var. 

 bdlona was unusually numerous ; hundreds having their dens in the holes of 

 the lime concretion formed by the water of these springs. Three individuals 

 were captured, over six feet in length. 



In the identifications of the species, and for the descriptions of new ones, 

 AVO are under great obligations to Prof. E. D. Cope, who has not only assisted 

 in this regard, but kindly criticised and revised the manuscript of this report, 

 and permitted the use of his new Check-List of North American Batrachia 

 and Reptilia, shortly to be published by the Smithsonian Institution. It will 

 be found that the nomenclature of the report is mostly the same as adopted 

 by this gentleman. We are also under obligations to Prof. S. F. Baird for 

 certain facilities afforded at the National Museum, and to Mr. Gr. Brown 

 Groode for many favors. No inconsiderable amount of assistance has also 

 been received from some of the members of the expedition in the presenta- 

 tion of specimens ; and it is a source of great pleasure to be able to note the 

 hearty cooperation and kindness of these gentlemen in assisting the zoologi- 

 cal sectian of this survey. 



