. Bulletin - United States National Museum. Science. 142 BULLETIN 177, UNITED STATES NATIONAL MUSEUM paired median series of rather rectangular, somewhat enlarged scales on the snout from the rostral to the juncture of the supraorbital semicircles, which are closely in contact with each other but with a few small scales interpolated here and there between them and be- tween the paired median series on the snout also; occipital as large as ear opening, triangular in shape, very prominent, with a somewhat smaller but equally noticeable preoccipital in contact with the supra- orbital semicircles
. Bulletin - United States National Museum. Science. 142 BULLETIN 177, UNITED STATES NATIONAL MUSEUM paired median series of rather rectangular, somewhat enlarged scales on the snout from the rostral to the juncture of the supraorbital semicircles, which are closely in contact with each other but with a few small scales interpolated here and there between them and be- tween the paired median series on the snout also; occipital as large as ear opening, triangular in shape, very prominent, with a somewhat smaller but equally noticeable preoccipital in contact with the supra- orbital semicircles and completely filling the area between them and the occipital: the extreme outer points of the occipital narrowly in contact with the posterior part of the supraorbital semicircles: supraocular disk composed of seven or eight polygonal smooth Figure46.—Variations in head shields of i s''.e populatic: from San Michel da Nord,HakL \. Nos. 74451, "445.:. "444;. 7447 ",,": incompletely separated from the semicircles by a row of granular scales; one comparatively large shield bordering the inner anterior edge of the first superciliary and surrounded by the supraocular granules: canthus rostralis only moderately developed, the four en- larged scales that distinguish it having a comparatively low median ridge not projecting over the loreal region: superciliary ridge indis- tinctly continuous with the scales of the canthus rostralis, composed of one very elongate and sharply keeled scale followed by a double series of small but differentiated tubercular scales, the anterior of which are separated from the supraocular disk by about four or five rows of granules; loreal rows four: scales of the subocular semicircle. 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 State
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