. Bulletin - United States National Museum. Science. â 146 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. Remarks.âTwo species occur on the Mexican Border: One (Sig- raodon Jiispidus) ranges west from the Atlantic and Gulf coasts to the western waters of the Colorado Basin, but does not reach the Pacific Coast Tract, though its range crosses four differentiation tracts, and it has become differentiated into a corresponding number of excellent subspecies. The other species (S. minimus) is restricted to the Elevated Central Tract, which separates the two desert tracts and is known only from the bou
. Bulletin - United States National Museum. Science. â 146 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. Remarks.âTwo species occur on the Mexican Border: One (Sig- raodon Jiispidus) ranges west from the Atlantic and Gulf coasts to the western waters of the Colorado Basin, but does not reach the Pacific Coast Tract, though its range crosses four differentiation tracts, and it has become differentiated into a corresponding number of excellent subspecies. The other species (S. minimus) is restricted to the Elevated Central Tract, which separates the two desert tracts and is known only from the boundary Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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