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PEOCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 73 



central spinous row often appearing as only slightly carinated scales. 

 The conspicuousness of the intervening whorls of flat scales will 

 readily separate it from its near relatives: erytJiromelas, and defensor; 

 the short dorsal crest spines separate it from quin quecarinata. 

 Material examined. — 



CTENOSAURA ERYTHROMELAS Boulenger 



Plates 28, 29 



Ctenosaura erythromelas Boulenger, 1886, Proc. Zool. Soc. London, p. 241, pi 

 23. — GuNTHER, 1890, Biol. Cent. Amer., Rept. and Batr., p. 59. 



Cachryx erythromelas Cope, 1887, Bull. 32, U. S. Nat. Mus., p. 43. 



Ctenosaura {Cachryx) annectens Werner, 1911, Jahrbuch Hamburg. Wissensch.. 

 Anst.,Pt. 2, p. 25. 



Type. — Brit. Mus. Nat. Hist. No. 1, male. 



Type locality. — "Mexico." No exact locality known. 



Diagnosis. — A slight indication of a dorso-nuchal crest. Scales on 

 posterior part of back a little larger than ventrals, rhomboidal, indis- 

 tinctly keeled. Upper surface of hind limbs with medium-sized spi- 

 nous scales. Tail shorter than head and body, its upper surface with 

 whorls of very large subequal spines, dii'ected upward and back- 

 ward, alternating with series of very small flat basal scales, the series 

 of small flat scales hardly noticeable at first glance, but becoming 

 more conspicuous posteriorly until near the mid-tail, where they are 

 very conspicuous. 



Distribution. — No exact locality is known for this species. The 

 type was purchased alive in Liverpool, England. The dealer did not 

 know whence it came. In 1905 Pohl sent several zoological speci- 

 mens from "Mexico" to the Naturhistorischen Museums in Ham- 

 burg. Among the number was a specimen of this species, hence the 

 type locality "Mexico." 



Description. — Brit. Mus. Nat. Hist. No. 1, male, type. Head normal 

 in length, covered with medium-sized scales, which in the adults are 

 slightly rugose and convex. Muzzle only slightly decurved; loreal 

 region slightly concave; supraoculars small, being separated from 

 each other by three rows of scales; parietal scales smaller than those 

 on top of muzzle; nostrils large, on canthus rostralis; supralabials, 8; 

 sublabials, 9; rostral and mental of equal width; ear opening as large 



