TEIID LIZAEDS OF THE GENUS CNEMIDOPHORUS 141 



CNEMIDOPHORUS LABIALIS Stejneger 



STRIPED RACE RUNNER 



1890. Cnemidophorus labiaUs Stejneger, Proc. U. S. Nat. INIus., vol. 12, p. 643 

 (type locality, "Cerros Island," west coast of Lower California, Mexico; 

 type specimen" U.S.N.M. No. 1559G, L. Belding, collector). — Cope, Trans. 

 Amer. Philos. Soc, vol. 17, 1892, p. 51. — Boulenger, Zool. Ilec. for 1890, vol. 

 27, " Reptilia," 1S92, p. 10. — Van Denburgh, Proc. Calif. Acad. Sci., ser. 2, 

 vol. 5, 1895, p. 128 ; vol. G, 1896, p. 345.— Cope, Ann. Rept. U. S. Nat. Mus. for 

 1898, 1900, p. 610.— Van Denbukgh, Proc. Calif. Acad. Sci., ser. 3, vol. 4, 

 1905, p. 24. — Gadow, Proc. Zool. Soc. London, 1906, p. 374. — Ditjiaes, Reptile 

 Book, 1907, p. 188. — Van Denbergh and Slevin, Proc. Calif. Acad. Sci., ser. 

 4, vol. 4, 1914, p. 145. — Ste.jneger and Barbour, Check List N. A. Ampli. and 

 Rept., 1917, p. 66. — Van Denburgh, Occas. Pap. Calif. Acad. Sci., vol. 10, 

 1922, p. 504.— Nelson, Mem. National Acad. Sci., vol. 21, 1922, p. 114.— 

 Schmidt, Bull. Amer. INlus. Nat. Hist., vol. 46, 1922, p. 074.— Stejneger and 

 Barbour, Check List N. A. Amph. and Rept., ed. 2, 1923, p. 71. 



Diagnosis. — This delicate little race runner may be clistinjzuisliecl 

 by the presence of tAvo frontoparietal plates in comparison with the 

 members of the hyperytlKtms group; and from most other species 

 of Cnemidof horns by its retention of an approximately 7-striped 

 pattern throughout life. The middorsal stripe is often forked. 

 There are no spots or reticulations on the body, but the femora 

 are prominently reticulated or .striped with white lines. The ground 

 color between the two lower lateral stripes on each side is lighter 

 and usually bright reddish brown as in daiiheiviae. The external 

 ventral j)lates are brilliant blue in color. C. labialis differs from 

 most of the T-lined specimens of fevplexus by the contact of the 

 anterior nasal with the second labial, and from variants of that 

 form (such as the type of avizonae) which possess this diagnostic 

 feature, by a low number of femoral pores, usually less than 14. 



Description. — Snout moderately pointed ; nostril anterior to nasal 

 suture; anterior nasal usuall}' in sub.stantial contact with second 

 upper labial; supraoculars 4; granules not extending forward past 

 the middle of the third supraocular, and very rarely beyond the 

 posterior border of the third supraocular; frontoparietals 2; parietals 

 3; anterior gulars moderately large, rather uniform in size; posterior 

 gulars smaller; mesoptychial scales moderate to large, largest on 

 posterior edge, growing smaller and smaller anteriorly, larger rows 

 4-6; postmesoptychial granules very fine, none on edge of posterior 

 gular fold. 



Body moderately elongate ; ventral scutes arranged in 8 longitudi- 

 nal and 30-33 transverse rows; dorsal granules moderately fine; 

 limbs not suggestive of strength, but well developed ; branchials 3-5 ; 



^ For important data pertaining to the type specimen and the type locality see the 

 footnote under the reference to the type of Verticaria 'bcldiniji, which was also described 

 from Cerros Island (p. 226). 



