. Bulletin - United States National Museum. Science. 6 BULLETIN 17 5, UNITED STATES NATIONAL MUSEUM and parietals are paired; prefrontals two in the three forms of the deppei group (fig. 5), four in all other forms of the genus (figs. 2-4); loreal usually present in some forms, only occasionally in others; nasals paired on either side, with the external nares between them; preoculars normally 1 or 2, occasionally 3; postoculars normally 2 in deppei and lineaticollis, normally 3 or 4 in all other forms of the. Figure I.—The normal arrangement of head scales in Pituophis: A, From above; B, from
. Bulletin - United States National Museum. Science. 6 BULLETIN 17 5, UNITED STATES NATIONAL MUSEUM and parietals are paired; prefrontals two in the three forms of the deppei group (fig. 5), four in all other forms of the genus (figs. 2-4); loreal usually present in some forms, only occasionally in others; nasals paired on either side, with the external nares between them; preoculars normally 1 or 2, occasionally 3; postoculars normally 2 in deppei and lineaticollis, normally 3 or 4 in all other forms of the. Figure I.—The normal arrangement of head scales in Pituophis: A, From above; B, from the side, az, Azygos; fr, frontal; il, infralabial; in, internasal; to, loreal; na, nasal; pa, parietal; pf, prefrontal; po, post- ocular; pr, preocular; ro, rostral; si, supralabial; so, supraocular. genus, occasionally 2, 5, or 6; azygos between frontal and prefrontals always absent in some forms, present or absent in others; azygos between prefrontal and preocular on either side, or between other head scales, occasionally present; supralabials 8 or 9 normally, most often 9 in vertebralis, most often 8 in all other forms, occasionally 7 or 10; infralabials 10 to 15, usually 14 in mugitus and ruthveni, most often 11 in deppei, normally 12 or 13 in all other forms; a single men-. 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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