TEIID LIZAltDS OF THE GENUS CNEMIDOPHORUS 03 



Affinities. — The close relationship existin*>; between fleppil and 

 lemniscatus has been emphasized above. For reasons to be given 

 in the general discussion at the end of this work, depjnl is presumed 

 to have originated from the lemniscatibs stock somewhere in Central 

 America, thus giving rise to the group which bears its name. 



The closest modern relative of depp'il is evidently cozumehis with 

 which it is structurally identical. Both are of the same general size. 

 G. guttatus, although agreeing in scutellation and not varying greatly 

 in coloration, differs consideral)ly by its larger size, and is consid- 

 ered to be a somewhat more distant relative. The relationships of 

 cozumel'us and guttatus with deppii are discussed in detail below 

 under the affinities of those forms. 



CNEMIDOPHORUS DEPPII COZUMELUS Gadow 



BROWN-BACKED RACE-RUNNER 



1906. CncnikloithorKS deppci cozuDicIa Gadow, Proc. Zool. Soc. London, p. .316 

 (type locality. " Cozumel Island, east coast of Yucatan " peninsula. Quintana 

 Roo, Mexico; 4 co-types, B.M.N.H., 1886.4.15.17-20). 



Diagnosis. — The brown-backed race-runner may be distinguished 

 as follows: supraoculars normally 3; parietals 8; postantebrachium 

 covered with small polygones or scutes; anal spurs absent; each side 

 with 2-5 narrow, w'avy, irregular, light lines; back imicolor, with 

 an unusually wide, yellowish brown, longitudinal hand i)res(Mit; 

 ground color of sides dark reddisli l)rown, in abrui)t contrast to color 

 of dorsal band: sides and femora never with conspicuous white or 

 blue spots ; lower surfaces white or light blue. 



This subspecies is easily distinguished from other forms of 

 Cnemidophorus by these characters and is approached only by a 

 phase of deppii which sometimes appears in southern Mexico and 

 adjacent areas to the south, from which it may be se})arated by the 

 '.inusually wdde dorsal band and the unusualh' wavy, irregular, 

 stripes on the sides. 



Description. — Snout modei-ately pointed; nostril anterior to nasal 

 .suture; anterior nasal separated fioni second upper labial: supra- 

 oculars normally 3; supraocidai- granules usually not extending for- 

 ward past the posterior border of the second supraocular; fronto- 

 parietals normally 2; parietals normally 3; anterior gulars small to 

 moderate laterally, graded, and with an enlarged patch medially; 

 anterior and posterior gulars usually abruptly ditferentiated ; pos- 

 terior gulars minute; mesoptychials moderate to large, uniform, 

 or a little smaller laterally, arranged in 2-5 enlarged transverse rows ; 

 postmesoptychiaLs minute usually hid behind posterior gular fold. 



Body moderately elongate; ventrals arranged in 8 longitudinal 

 and 31-36 transverse rows; dorsal granules fine; limbs well devel- 

 oped; brachials 6-9; ant<>brachials 2-4; brachials continuous with 



