1886.] MR. BOULENGER ON A NEW IGUANOID LIZARD. 241 



5. Description of a new Iguanoicl Lizard living in the 

 Society^s Gardens. By G. A. Botjlenger., F.Z.S. 

 [Eeceived April 6, 1886.] 

 (Plate XXIII.) 



Amongst the recent additions to the Society's living collection of 

 Reptiles is an example of Lizard of the genus Ctenosaura, which 

 the Secretary has requested me to determine. It belongs to an 

 undescribed species, which I propose to call 



Ctenosaura erythromelas, sp. n. ("Plate XXIII.) 



Body a little depressed. A slight indication of a dorso-nuchal 

 crest. Scales on posterior part of back a little larger than ventrals, 

 rhomboidal, indistinctly keeled. Upper surface of hind limbs with 

 large spinose scales. Tail shorter than head and bodj^ much de- 

 pressed, except quite at the end ; its upper surface with transverse 

 series of very large, subequal spines, directed upwards and back- 

 wards, alternating with series of very small scales ; the series of 

 small scales inconspicuous, at first glance, on the anterior half of 

 the tail ; lower surface of tail with smaller pointed keeled scales, 

 the number of transverse series heing the same as on the upper 

 surface. Eight femoral pores on each side. Blackish olive above, 

 with a large patch of vermilion-red on each side of the body, and 

 variegations of the same colour on the sides of the head and neck ; 

 lower surfaces grey, throat marbled with red ; three oblique black 

 bands on each side behind the fore limb; two black bands across 

 the humerus. Tympanum yellowish. Iris golden. 



Length from snout to vent 100 millim., head 24, tail 88. 



The locality of the single specimen, acquired by purchase of Mr. 

 W. Cioss of Liverpool on the 3rd inst., is not known. 



This new species again lessens the gap between the genera Cteno- 

 saura and Cachryx. I therefore propose to unite the two genera. 

 In connection with this subject I must draw attention to an extra- 

 ordinary statement to be found in one of Prof. Cope's latest papers \ 

 He remarks : — "This genus {Cachryx, Cope) is of the type of Cteno- 

 saura, differing only in the characters of its tail. It lacks the ter- 

 minal portion, which is in that and other genera free from spinous 

 scales. It is not in my opinion allied to Urocentron or Hoplocercus, 

 as suggested by Bocourt, genera which belong to the terrestrial 

 division of the family, or Humivagse." Mr. Cope not only omits 

 to add that 1 was the first to assign his genus to the correct jilace in 

 the system, but forgets that he is himself responsible for the error 

 now corrected, and not M. Bocourt, who simply endorsed his 

 views ; for on referring to Cope's original (and unique) account 

 of Cachryx' we read, " This genus is allied to Urocentrum and 

 Hoplurus, but diners in the possession o/ /emoral pores." 



1 Proc. Amer. Philos. Soc. 1885 (1886), p. 270. 



2 Proc. Acad. Philad. 1866, p. 124. 



