ART. 12 REVISION OF LIZARDS OF GENUS CTENOSAURA BAILEY 47 



or almost as large as orbit; transverse gular fold prominent; dorsa] 

 scales almost granular on nape, becoming larger posteriorly until about 

 the mid-region of the back, where they are larger than the ventrals, 

 being rhomboidal in shape, obtusely keeled, and slightly carinated, 

 more so in the sacral region. Lateral scales smaller than either dor- 

 sals or ventrals. Upper surface of hind limbs with medium-sized 

 spinous scales. Tail shorter than head and body, slightly constricted 

 at insertion, and somewhat depressed, except near distal, where it 

 is cylindrical; its upper surface with whorls of very large subequal 

 spines, directed upward and backward, alternating with series of 

 small, flat scales, inconspicuous at first glance, but becoming more 

 conspicuous posteriorly until near the mid-tail, where they become 

 very conspicuous; lower surface of tail with smaller, pointed, keeled 

 scales, the number of transverse series not being the same as on the 

 upper surface except on the distal half of the organ. Dorsal nuchal 

 crest, beginning just back of the head on the nape, is indicated by 35 

 to 60 slightly raised median dorsal scales, which extend usually about 

 one-third of the way down the back and then gradually merge with 

 the general dorsal scales. In no instance does the dorsal crest extend 

 completely to the sacrum. Digits shortened. With hind limb 

 extended the longest digit reaches to the anterior insertion of the 

 fore limb; femoral pores, 5-5, 6-6, to 8-8. 

 Measurements. — 



Brit. Mus., 



type. No. 1, 



M. 



Mm. 



Length of head 35 24 



Length of body. 120 66 



Lengthoftail _ 150 88 



Total length 285 178 



Width of head over orbits__ 25 (?) 



Coloration. — Boulenger in his original description figures this species 

 in colors and gave the following description taken from a living 

 specimen, the type. 



Blackish olive above, with a large patch of vermilion-red on each side of the 

 body, and variegations of the same color on the sides of the head and neck; low^er 

 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. 



Werner's type specimen of Ctenosaura (Cachryx) annectens, an adult 

 male in the museum in Hamburg, Germany, although preserved in 

 alcohol for several years ^^ and without its epidermis, exhibits a 

 distinct reddish tinge about the head, neck, and shoulders. 



" Described in 1911, but probably in alcohol many years previous. 



