ART. 12 EEVISIOlSr OF LIZARDS OF GENUS CTENOSAUKA BAILEY 19 



Measurements. — 



Length of head 



Length of body 



Length of tail 



Total length 



Width of head over orbits. 



The following paragraphs are taken from Van Denburgh: 



Coloration. — The top and sides of the head are dull pea green. The back, 

 sides, and hind limbs are pale straw color, heavily washed with pale olive, and 

 spotted and reticulated with seal brown and black. There are five black 

 blotches on the vertebral line, separated by areas paler than the general tint. 

 The first of these black markings is very small; the second is broader than long; 

 the third and fourth are very large and faintly continuous with the blackish 

 brown of the ventral surface; the fifth is almost confined to the enlarged .medial 

 scales. There are two longitudinal black blotches on the side of the neck and 

 two corresponding lines on the temple. The chin, gular region, chest, and fore 

 limbs are blackish brown. The tail has a ground color of straw yellow clouded 

 with olive, but is dull pea green on the spines, and barred with seal brown 

 terminally. 



The youngest individuals (58 to 76 mm. from snout to vent) are bright terre- 

 verde green above, except on the tail, which has broad rings of dark olive sepa- 

 rated by narrow ones of broccoli brown. There are very faint indications of 

 dark vertebral bars. The lower parts are yellowish white, tinged with green. 

 As the animals increase in size the green gradually disappears and the dark 

 markings increase in size and number until adult coloration is assumed. 



A living specimen was colored as follows: The back and sides are grayish, 

 mottled with black. Three transverse black bands across the shoulders. The 

 upper surfaces of the fore limbs are black, spotted with gray; of the hind limbs, 

 gray mottled with black. The gular region is black, bordered with graJ^ The 

 ventral surface between the fore limbs is black. The belly is grayish. The tail 

 in all specimens is ringed with alternate wide banks of brown and yellow. 



Remarks. — This large lizard is very common in many parts of the cape region 

 of Lower California, Mexico, where it lives either among rocks or trees. It ordi- 

 narily lives upon vegetable food, but it may eat crabs when its usual food is 

 scanty. It is locally known as the iguana and is eaten by the natives. Its 

 spiny tail is used by it as a means of defense. 



Mr. J. R. Slevin,^^ of the California Academy of Science, says of 

 this species: 



It is fairly abundant where found and inhabits the large granite bowlders in 

 company v/ith Uta thalassina. Where bowlders are not plentiful these iguanas 

 resort to trees. At San Bartolo they were seen only among the granite bowlders, 

 which abound in that vicinity, but at San Pedro and Agua Caliente they were 

 found in the trees; none were observed on the ground. They seem to live 



'3 Occ. Papers of Calif. Acad, of Sci., No. 10, pp. 67-71, 1922. 



