312 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



it is doubtful that the specimen in question, if identified correctly, 

 came from the present Ft. Wingate, which is located in the pinyon- 

 juniper association. On the basis of known distribution, it probably 

 originated near San Rafael, Valencia County, where Ft. Wmgate 

 formerly was located (Hoffmeister, 1951, p. 34); however, it is possible 

 that the specimen was misidentified, for it was sent alive to the 

 U.S. National Museum by R. W. wShufeldt and, seemingly, was 

 never preserved (D. M. Cochran, in Utt.). 

 Locality records : 



MCKINLEY CO.: Prewitt (UMMZ 79308); 8 mi. ESE. Prewitt (CU 5884); 

 VALENCIA CO.: 8 mi. SE. Grants (UMMZ 86633); 10.4 mi. S. Grants (CU 5591); 

 11.5 mi. SSE. Grants (CWGF); San Rafael (CWGF), 



Crotaliis molossus tnolossus Baird and Girard 



Chenoweth (1950, p. 534) first indicated that the black-tailed 

 rattlesnake might be present in the Zimi region. Previously, the 

 northernmost New Mexico record wasLaguna (LMK 3197), although 

 a smashed individual was seen on the road near Cubero, Valencia 

 County, by Charles M. Bogert (L. M. Klauber, in litt.). This 

 species may range somewhat further north. James S. Findley (pers. 

 comm.) informed me that C. molossus has been reported by other 

 observers in the Sandia Mountains, Sandoval County, and near 

 Cuba, Rio Arriba County. 



The single specimen, found during the present survey, was dead 

 on the road in Lobo Canyon at approximately 7000 feet on Mt. 

 Taylor. Its anterior color pattern is typical of C. molossus from 

 south-central New Mexico, but there are only 12 distinct dorsal 

 blotches, the entire posterior half of the body being uniform olive 

 brown. The specimen has 27 dorsal scale rows at midbody; other 

 counts cannot be ascertained because of its damaged condition. 



Locality records : 



VALENCIA CO.: 8 mi. NE. Grants (CU 5868); Laguna (LMK 3197*). 

 Crotalus viridis viridis Rafinesque x C. v. nuntius Klauber 



Prairie rattlesnakes in the Zuni region present an east-west inter- 

 grading situation similar to that of Crotaphytus collaris. Specimens 

 collected east of the Apache County, Arizona-McKinley County, 

 New Mexico, border have been considered nominate C. viridis 

 previously (Gehlbach, 1956, p. 371; Klauber, 1935, p. 85). In describ- 

 ing C. V. nuntius of the Hopi Indian country, Klauber (1935) stated 

 that easterly intergradation of it with nominate C. viridis was 

 gradual over a broad zone. He considered specimens from Gallup 

 closest to C. V. viridis in coloration but with low ventral scale counts. 



When compared with comprehensive data presented by Klauber 



