Page 29 - Black Range Naturalist, Vol. 3, No. 1
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   represent the possibility of intergrades at this locale. Video of a snake recorded at the Gila Cliff dwellings is found at this link.
   Middle Percha drainage (west of Kingston).
 Crotalus ornatus sightings documented on the iNaturalist website. The sighting shown in the upper left is from the Middle Fork of the Gila River, not far from where the video of what Bob Barnes identified as a Northern Black-tailed Rattlesnake was taken.
The iNaturalist map of sightings for this subspecies (the subspecies which is found near the Black Range) is shown below.
Crotalus molossus molossus sightings documented on the iNaturalist website. The righthand sighting of the two shown in the upper left is in the vicinity where the video mentioned above was recorded.
Crotalus ornatus from the southeastern slopes of the Black Range, photograph by Randy Gray. July 2019
In general, it is fairly safe to assert that a Black-tailed Rattlesnake found in the Black Range will be C. ornatus.

1. ”Phylogeography of Northern Populations of the Black- Tailed Rattlesnake (Crotalus molossus Baird and Girard, 1853), With the Revalidation of C. ornatus Hallowell, 1854” by Christopher G. Anderson and Eli Greenbaum, Herpetological Monographs, 26(1):19-57. 2012
2. Campbell, J. A., and W. W. Lamar. 2004, The Venomous Reptiles of Latin America. Cornell University Press, USA.
3. Murphy, R.W., J. Fu, A. Lathrop, J. V. Feltham, and V. Kovac. 2002. “Phylogeny of the rattlesnakes (Crotalus and Sistrurus) inferred from sequences of five mitochondrial DNA genes”. Pp. 69–92 in G.W. Schuett, M. Hoggren, M.E. Douglas, and H.W. Green (Eds.), Biology of the Vipers. Eagle Mountain Publishing, USA.
4. "A Quantitative Analysis of the Ancestral Area of Rattlesnakes" by Aaron J. Place and Charles I. Abramson, Journal of Herpetology, Vol. 38, No. 1 (March 2004) pp. 152-156
  
 

    Note that sightings of both species are documented on iNaturalist for the area around the Gila Cliff Dwellings. This may represent a misidentification of the Ornate Black-tailed Rattlesnake recorded for that area, it may represent the fact that this is an area where both species are present, or it may
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