. Breviora. 14 BREVIORA No. 466 The snout color and symmetric body annuli of ruthveni make these animals easily distinguishable from the sympatric nelsoni. Similarly, the high number of annuli of celaenops and annulata are different from the usually few annuli of the ringed or saddled blairi form of alterna. In the other cases, some combination of color pattern with ventral scale number serves to diagnose members of the mexicana group. Skull Data from dorsoventral radiographs of similarly sized, adult alterna (N = 7) and mexicana (N = 12) were compared to quantify the observation of a more tri
. Breviora. 14 BREVIORA No. 466 The snout color and symmetric body annuli of ruthveni make these animals easily distinguishable from the sympatric nelsoni. Similarly, the high number of annuli of celaenops and annulata are different from the usually few annuli of the ringed or saddled blairi form of alterna. In the other cases, some combination of color pattern with ventral scale number serves to diagnose members of the mexicana group. Skull Data from dorsoventral radiographs of similarly sized, adult alterna (N = 7) and mexicana (N = 12) were compared to quantify the observation of a more triangular head shape in alterna. The premaxilla to occipital condyle length, the width of the maxilla at L. alterna H L. mexicana I I. .72 .76 80 .84 PRE- -i- POST-ORBITAL WIDTH Figure 3. The ratio of pre-orbital and post-orbital width of L. alterna and L. mexicana 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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