514 ZOOLOGY— BATE AC HI ANS AND REPTILES. 



A curious fact in regard to the distribution of the lizards is that, while 

 in 1872 Crotaphytus ivislizenii was found to be very abundant in Utah and 

 Nevada, C. collaris being extremely scarce ; in 1873 in Colorado, New Mexico, 

 and Arizona, the latter was the characteristic Saurian of the localities men- 

 tioned, C. ivislisenii being seldom seen. 



The Phrijnosoma, or "Horned Toads", were very numerous ; and some 

 of the specimens of P. douglassii collected exhibit exaggerated examples of 

 specific markings, very different from the more northern forms. Among 

 those secured are two fine examples of P. planiceps, so called by Hallowell 

 many years ago, but since that time lost sight of. 



A very beautiful lizard, new to science and the fauna, was discovered 

 through the exertion of Mr. II. W. Henshaw in Southern Arizona, to which 

 Professor Cope has assigned the name Sceloporus jarrovii, and which proba- 

 bly belongs exclusively to the Sonoran fauna; and two other new species 

 belonging to the same family have also been discovered. 



The Batrachia are well represented in the collection ; many species 

 having been obtained, as well as some new to science. The occurrence of 

 Cliorophilus triseriatus, at Pagosa, in Colorado, is interesting ; this being the 

 first time it has been discovered so far west. 



The observations of this year, it may be mentioned, fully confirm those 

 of Dr. Elliott Cones, U. S. A., to whom American Herpetologists are greatly 

 indebted for his interesting researches in this region, and to whom we owe 

 our sincere thanks for the very interesting and valuable chapter which 

 follows this report, the result of personal observation while stationed in 

 Arizona, and which is given for the reason that a lengthened stay in a por- 

 tion of the Territory visited by this expedition enabled him to furnish biog- 

 raphies of the species observed by our collectors, who, in their rapid 

 marches, could do but little besides collecting specimens. This chapter 

 enumerates some species not observed by the expedition. 



In 1874, owing to the fact that two special Natural History parties 

 were organized to operate in most favorable localities for Herpetological 

 work, a very large collection was made of interest and value. In addition 

 to these parties, the services of Mr. C. E. Aiken as collector were made 



