214 



NORTH AMERICAN FAUNA. 

 List of specimens of Thamnophis vagrans. 



[No. 7. 



U. s. 



Nat. 

 jVIils. 

 No. 



18699 

 18700 



18701 

 18702 

 18703 

 18704 



1S705 



1S706 

 18707 



Locality. 



Silver Creek, Nev 



Ash Meadows, Nev 



do 



North Fork, Kern River, Calif. . . 



do ... 



Soda Springs, North Fork, Kern 



River, Calif. 

 Whitney Creek, Calif 



Owens River, Calif. 

 Lone Pine, Calif 



Alti- 

 tude. 



Feet. 



7, 000 



8, 500 

 6,000 



D 



ate. 



Nov. 



8, 1800 



Mar, 



3, 1891 



Mar. 



4, 1891 



Sept. 



12, L891 



Sept. 



10, 1801 



Aug. 



15, 1891 



Sept. 



5, 1891 



July 



20, 1891 



June 



11,1891 



Collector. 



Bailey 

 Palmer 

 ...do . 

 ...do . 



Nelson 

 Bailey 



...do .. 



Nelson 

 Palmer 



Remark 



Thamnophis parietalis (Say). 



A single specimen (No. 18715) from Horse Corral Meadows, Fresno 

 County, Calif., collected by Dr. A. K. Fisher, August 10, 1891, having 

 nineteen scale rows, seven supralabials, and one preocular, lias been 

 referred to the present form in spite of the fact that the superior spots 

 along the dorsal stripe are not fused into a solid black band. I have, 

 however, before me a specimen from San Francisco (No. 893), referred 

 to Th. parietalis by Cope, which in this respect agrees with the present 

 specimen, but the dorsal is broader. On the other hand our speci- 

 men presents many points of resemblance to so-called Th. leptoeephala, 

 but I am unable to distinguish specimens of the latter with the above 

 scale formula from specimens of the Th. sirtalis group. I have failed 

 so far to distinguish any specific difference between Th. sirtalis and 

 leptoeephala, and am inclined to think that the latter is made up of 

 similarly degenerate specimens belonging to different species or forms. 



Family Crotalid^e. 



Crotalus tigris Kenn. 



The ' tiger-rattler,' of which the expedition has brought home quite 

 a series, is one of the rarest species in collections. Discovered during 

 the survey of the boundary between the United States and Mexico, 

 and described by Kennicott, the habitat of the species was given in 

 general terms as " Deserts of Gila and Colorado," but I can find no 

 evidence of specimens recorded from anywhere except from the Sierra del 

 Pozo Verde,* in Arizona. A specimen was afterwards collected by Dr. 

 Irwin at Fort Buchanan, Ariz., and recorded by Dr. Yarrow in his 



* The name is written both Sierra del Pozo Verde and Sierra Verde in the Rept. 

 U.S. and Mex. Bound. Surv. (cf. vol.i, pt. i, p. 121 and pt. n, p. 70). This range is 

 situated on the boundary between Arizona and Sonora, nearly due south of Babo- 

 quivari Peak, and about 50 miles northwest of Nogales. A spring known as ' Agua 

 del Pozo Verde (Green Well)' is situated at the foot of the western slope near the 

 southern end of the range. 



