20 BULLETIN 15 4, UNITED STATES NATIONAL MUSEUM 



Tlic fullest accounts of the habits of these lizards are given below 

 under te.sseUatuH, sexVaicatux, and 'pevylexus. 



SUBDIVISIONS OF THE GENUS CNEMIDOPHORUS 



The 25 forms of CnemkloiJhoms recognized here fall naturally 

 into five groups. It seems impossible to prepare a simple, usable 

 synopsis for the determination of every specimen, since the ampli- 

 tude of variation exhibited by certain phases within the several 

 groups is found to overlap. Yet, it is believed that every species 

 may be correctly placed by the following key if a representative 

 series is available. It wdll be noted that young specimens are needed 

 for use in separating the tessellatus group from the dcpp'd and 

 sexlineatus groups. 



KEV TO THE GHOrPS OF CNE.MIDOI'IIOUUS 



1. Parietals normally three; nostril usually anterior to nasal suture 2. 



Parietals normally Ave; nostril usually in the siituro ])et\veen the nasnl 



plates LEMNISCATUS GROUP, p. 30. 



(Central America and South America.) 



2. Frontoparietal plates normally two 3. 



Frontoparietal phite norma.ly one HYPERYTHRUS GROUP, p. 220. 



(Southern California and Lower California.) 



3. Sides of young completely striped, and spots, if present, confined to the 



dark interspaces 4. 



Sides of young not completely striped, but with fcsscUatioiis. cross-l)ars 



or spots TESSELLATUS GROUP, p. 14G. 



(Western United States, northern Mexico, and l^nwci' California.) 



4. Sui>raoculars normally four SEXLINEATUS GROUP, p. 7G. 



(United States, Mexico, and Guatemala.) 

 Supraoculars normally three DEPPII GROUP, p. 5G. 



A consideration of the origin and relationships of these groups is 

 reserved for the general discussion at the end of this work (pp. 

 251-260). 



FORMS WRONGLY ASSIGNED TO CNEMIDOPHORUS 



Numerous forms have been assigned to Cneviidophorus that should 

 now be regarded as members of other genera. The following list 

 gives the particulars concerning these reports, and for the sake of 

 completeness and in the hope that it may prove useful to future 

 workers, it is included here. 



