TEIID LIZARDS OF THE GEXUS CNEMIDOPHORUS 249 



occurs imtlifferentiated throughout the pcninsuhir area of Lower 

 California, it seems reasonable to conclude that it has become dis- 

 nibuted over this area subsequent to the post-Pliocene submergence. 

 Therefore, the present island races of hyperythrus may be assumed 

 to have been isohited during tlio most recent submergence (late 

 Pleistocene). 



There is some question as to the origin of j)lcfi(s. Whether it was 

 partly derived from caeruleus or entirely derived from hyperythrus 

 is uncertain, since the dorsal striping is entirely obscured in pictus 

 and since the diagnoses of both of the possible parent forms rests 

 chiefly on this character. Data secured from the records of sound- 

 ings and the geographical location with respect to each both tend 

 to favor the derivation of jylctu-s from hyperythrus. 



K\jp&r\jtVirus 



Figure 35. — Diagram of the slitdsed kelationships of the hyperytiircs 



I ; ROUP 



The writer's interpretations of the genetic relationships of the 

 forms of the hyperythrus group are expressed by the foregoing 

 diagram. 



SPECIES OF UNCERTAIN TAXONOMIC POSITION 



Onl}' one described form of C nemid'ophoi'us has not been avail- 

 able for examination, and unfortunately the published data are 

 insufficient to allow a determination of its true taxonomic position. 



CNEMmOPHORUS SACKH Wiegmann 



1S34. Ciiemidoiihonis sackii. Wiegmann, Herpetologia Mexieana, p. 28 (type 

 locality, "Mexico"; type specimen in Berlin Museum). — Gray, Cat. Liz. 

 British Mus., 1845, p. 22.— Cope, Proc. Acad. Nat. Sci. I'hila., 1866, p. 125. — 

 Peters, Monatsber. Berl. Akad. Wissensch., 1869, p. 63. — ^GtJNTHER, Zool. Rec. 

 for 1869, vol. 6, 1870, p. 111. — Sumichkast, La Naturaleza, ser. 1, vol. 6, 

 1884. p. 39.— Duces, La Naturaleza. ser. 2. vol. 2, 1S97. p. 480. 



18.56. Cnemklophorusi scxUncatits sackii Lichtenstein, Noinenclator Berol., p. 

 13, (part). 



1862. Amciva sackii Cope, Proc. Acad. Nat. Sci. Phila., p. 63. 



1874. Cncmidophanis scvlincatus sackii Bocoukt, Miss. sci. Mex. et Amer. 

 cent., vol. 3, p. 276, pi. 20c, figs. 6, 6r;-e. 



Systematic Notes. — Because of its importance, in the absence of a 



specimen, the original Latin diagnosis given for this species by 



Wiegmann (1834) may be quoted as follows: " Squamis gulae sub- 



acqualibus, parvis, oblongis; .squamis mesoptj'chii mediocribus ini- 



2306—31 17 



