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Show 374 DR. H. GAD0W ON EVOLUTION [Mar. 20, CNEMIDOPHORUS LABIALIS Stejneger. Based upon five specimens from Cedros Island, Lower California. Distinguished from all the other Cnemidophori by the nasal being n contact with the second upper labial, which latter completely separates the postnasal from the first labial. Supraoculars 4, but in the figure given by Cope the 4th or posterior supraocular is broken up into two or three smaller scales ; a condition which may be an individual abnormality, but which also is shown in the figures of C. sericeus and semifasciatus. The collar, to judge from the figure, is composed of decidedly small scales, only those of the middle being somewhat larger; all the scales, however, form the posterior sharp margin of the collar, there being no granules. The posterior surface of the forearm is covered with granules, about three rows of which are slightly enlarged. Femoral rows 5, or only 4. Pores 12 to 13. Only two large preanal plates, the usual posterior pair being fused into one broad plate. Total length 55 m m. " Colour above dark brown, with six longitudinal light lines and a median clay-coloured band of the same shade as the top of the head ; two light longitudinal lines on fore limbs and three on hind limbs; under side whitish, more or less suffused with bluish, especially on the flanks." This little species is very puzzling. The arrangement of the labials and nasals is unique. The condition of the collar is essentially that of the tessellatus-group, but recalling the gularis-group by the sharp edge without granules. However, a very similar collar is given to C. octolineatus and C. inornatus in Cope's figures. The slightly enlarged granules on the forearm point to C. deppei and to C. sexlineatus, which latter is, moreover, closely approached by the colour-pattern. The three peculiar pale stripes on the hind limb recall the equally peculiar three black stripes of C. martyris. References to the original descriptions of species of Cnemidophorus. C. sexlineatus Linne, Syst. Nat. xii. 1766, p. 364. DEPPEI- Group. C. guttatus Wiegm. Herpetolog. Mexicana, 1834, p. 29. ^microlejndopus Cope, Proc. A m . Phil. Soc. xvii. 1877, p. 93. = unicolor Cope, ibid. C. deppei Wiegm. Herp. Mexic. 1834, p. 28. = decemlineaius Hallowell, Proc. Ac. Philad. 1860, p. 482. = lineatissimus Cope, Proc. A m . Phil. Soc. 1877, p. 94. = alfaronis Cope, Proc. Ac. Philad. 1894, p. 199. C. immutabilis Cope, Proc. A m . Phil. Soc. 1877, p. 93. = C. guttatus var. striata Gadow, Proc. Roy. Soc. 1903, p. 155. |