374 DR. H. GADOW OX EVOLUTIOX [Mar. 20, 



Cnemidophorus labialis Stejneger. 



Based upon five specimens from Ceclros Island, Lowei" California. 



Distinguished from all the other Cneviido2)hori 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 postei-ior supraocular is 

 bi'oken up into two or three smaller scales ; a condition wliich may 

 be an individual abnoi'mality, but which also is shown in the figures 

 of C. sericeiis and semifasciatus . The collar, to judge fi'om the 

 figure, is composed of decidedly small scales, only those of the 

 middle being somewhat lai-ger ; all the scales, however, form the 

 posteiior sharp mai-gin of the collar, there being no granules. 

 The posterior sui'face of the forearm is covei'ed with gi-anules, 

 about three rows of which ai-e slightly enlai-ged. Femoral rows 5, 

 or only 4. Pores 12 to 13. Only two large pi-eanal plates, the 

 usual postei'ior pair being fused into one broad plate. Total 

 length 55 mm. 



" Colour above dark bi'own, 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-g,vo\v^, 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 enlai-ged granules on the forearm point to 

 C, deppei and to C sexlhieatus, 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 descri2itions of species 

 of Cnemidophorus. 



C. sexlineatus Linne, Syst. Nat. xii. 1766, p. 364. 



DsppEi-GrowT^. 



C. guttaUis Wiegm. Herpetolog. Mexicana, 1834, p. 29. 



= microlepidopus Cope, Proc. Am. Phil. Soc. xvii. 1877, 

 p. 93. 



= u'iiicolor Cope, ibid. 

 C. deppei Wiegm. Herp, Mexic. 1834, p. 28. 



= decemlineatus Hallowell, Proc. Ac. Philad. 1860, p. 482. 



= Uneatissimus Cope, Pi^oc. Am. Phil. Soc. 1877, p. 94. 



= alfaronis Cope, Proc. Ac. Philad. 1894, p. 199. 

 C. immutabilis Cope, Proc. Am. Phil. Soc. 1877, p. 93. 



= C. guUatas var. striata Gadow, Proc. Roy. Soc. 1903, 

 p. 155. 



