64 3. IGUANID^ 



Genus 3. Ctenosaura 



Ctenosaura Wiecmann, Isis von Oken, 1828, p. 371 (type, cycluroides) . 

 EnyaliosauTus Gray, Cat. Lizards Brit. Mus., 184-5, p. 192. 



This genus includes the large lizards or iguanas which 

 have the tail armed with strong spines. The scales of the 

 median dorsal row are much enlarged, forming a conspicuous 

 crest. The head is covered with small scales. There is a 

 very strong transverse gular fold, but no gular pouch. The 

 dorsal scales are small. Many of the caudal scales are spin- 

 ose. There is a short series of femoral pores. The digits 

 have keeled plates below. A number of species are known 

 from Central America and Mexico. One of these has been 

 reported from Nogales, Arizona. Another is common in 

 the Cape Region of Lower California. These may be dis- 

 tinguished by the following: 



Synopsis of Species 

 a. — Dorsal crest extending back to rump. 



C. multispinis. — p. 64. 



a'. — Dorsal crest on anterior portion of dorsal region only, 



C. hemilopha. — p. 66. 



4. Ctenosaura multispinis Cope 

 Black Spiny-tailed Iguana 



Cyclura aeanthura Cope, Proc. Amer. Philos. Soc, 1879, p. 261. 

 Ctenosaura multisfinis Cope, Proc. Amer. Philos. Soc, Vol. XXIII, 1885, 



p. 197 (part). 

 Ctenosaura multisfinis Cope, Proc. Amer. Philos. So., Vol. XXIII, 1885, 



p. 267 (type locality, Dondomingvillo, Oaxaca, Mexico); 



Cope, Report U. S. Nat. Mus. for 1898, 1900, p. 240; Ditmars, 



Reptile Book, 1907, p. 107; Stejnecer & Barbour, Check Lijt 



N. Amer. .'^mph. Rept., 1917, p. 44. 



