566 REPORT OF NATIONAL MUSEUM, 1898. 



CNEMIDOPHORUS Wagler. 



Cnemidophorus Waglek, part, Syst. Aini>b., 1830, p, 154. — Wiegmann, Herpt. 

 Mex., 1834, p. 9. — Dumeril and Bibron, Erp. Gen., V, 1839, p. 123.— Gray, 

 Cat. Liz., 1845, p. 20.— Bocourt, Miss. Sci. Mex., Kept., 1874, p. 269.— 

 BouLENGEU, Cat. Liz., II, 1885, p. 360. 



Ameiva riTZiX(;ER, Nene Class. Rept., 1826, p. 21. 



Teriicaria Cope, Proc. Amer. Phil. Soc, XI, 1869, p. 158. 



Scaly portion of tongue cordate behind and not retractile. Tail 

 rounded. Teeth longitudinally compressed. Head shields large, reg- 

 ular; ventrals large; parietals and frontoparietals distinct; supercil- 

 iaiics segmental. A collar fold. Femoral pores present, in the center 

 of a rosette of scales. 



This genus embra(;es many species of the Neotropical realm, exclu- 

 sive of the West Indian region, where it is replaced by Ameica. Five 

 species enter the Nearctic realm, and all but one of these are restricted 

 to the Sonoran region. This one, C. sexlineatus Liiinteus, ranges the 

 entire Nearctic, excepting the Hudsonian and Alleghenian districts, 

 and the northern parts of the Central and Californian. 



Osteology. — For characters of the skeleton 1 have three individuals 

 of the G. tessellatus from my own, and one of the G. sexlineatus from the 

 national collection. The alveolar portion of the premaxillary is promi- 

 nent, and is marked off from that of the maxillary bone by a shallow 

 emargination on each side. The superior spine is long, and the palatal 

 border is deeply emargiuate to receive the narrow anterior production 

 of the vomers. The nasals are distinct and rather elongate, although 

 encroached on in front by the enlarged nostrils. The frontal is single 

 and is rather narrow. The parietal is without pineal foramen in the 

 adult. The ])arieto(iuadrate arch is well elevated, and is braced below 

 by the small paroccipital. The supraoccipital is in close contact with 

 the parietal by its middle portion, and it is distinct from the exoccipital 

 by suture. The prefrontal does not extend above the orbit; the lach- 

 rymal is smaller, but rather large, and forms a suture with the jugal. 

 The postfront;\l is wanting, being fused with the i^ostorbital. The 

 latter is produced downward and has a longer suture with the supra- 

 temi)oral than with the narrow jugal. The quadrate has an external 

 conch only. The vomers are elongate and are in contact throughout, 

 but each is swollen on the middle line so that they are divided by a 

 groove along their common suture. The narial fissure is long and nar- 

 row, and is contracted anteriorly, and then enlarged foramen like at 

 the anterior extiemity. The vomerine branch of the palatines is longer 

 than the maxillary branch; the pterygoid branch is not very wide, and 

 the palatine foramen is of moderate size. The ectopterygoid is rather 

 wide and has an anterior suture with the palatine bone as well as with 

 the maxillary; it is deflected posteriorly. Pterygoid moderately 

 expanded anteriorly and contracting gradually; the posterior portion 

 but slightly grooved, and attached to the basipterygoid process by its 



