. Bulletin - United States National Museum. Science. FiQ. lampropeltia pyrrhomelaena. about 2 x nat. Showing an extra labial in each series. A study of the whole genus indicates most strongly that the primitive scale formula is 23-21-19. This and its simple derivative, 21-23-21-19, is characteristic of those forms of the two most wide- spread and diversified groups (triangulum and getulus) which show, in other structural features, the most primitive condition. Higher and lower for- mulae in the genus Lampropeltis are be- lieved to indicate spe- cialization, or depar- ture from the original
. Bulletin - United States National Museum. Science. FiQ. lampropeltia pyrrhomelaena. about 2 x nat. Showing an extra labial in each series. A study of the whole genus indicates most strongly that the primitive scale formula is 23-21-19. This and its simple derivative, 21-23-21-19, is characteristic of those forms of the two most wide- spread and diversified groups (triangulum and getulus) which show, in other structural features, the most primitive condition. Higher and lower for- mulae in the genus Lampropeltis are be- lieved to indicate spe- cialization, or depar- ture from the original stock of the genus. Variation in labials.—-Both upper and lower labial series are remarkably constant throughout the genus. The supralabials are normally seven (fig. 3), but in very rare instances this number is reduced to six by a fusion of the sixth with the fifth. Variation to eight occurs occasionally in many forms and in a few (calligaster, pyrrhomelae- na) it is rather common. In all cases the presence of eight supralabials is due to the interpolation 4, 5, and 6), or to the. Fig. 6.—Lampropeltis calligaster (Univ. Mich. no. 44973). li X NAT. SIZE. Showing position of the added labial in each 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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