ART. 12 EEVISION OF LIZARDS OF GENUS CTENOSAUEA BAILEY 



31 



fourth row bordering on the row of median caudal spines; the subse- 

 quent whorls of spinous scales, up to half the length of the tail, are 

 separated from each other by two rows of small scales. The distal 

 half of the tail appears spinous throughout, the smaller scales becom- 

 ing larger and gradually pass into the spinous type. The median 

 caudal spines appear to be "set into" the other scales, so to speak; 

 the margins of the adjacent scales lapping over the edges of the 

 median row. The toes are very long, especially those of the hind 

 feet; the claws are long and sharp. Femoral pores, right side 6, left 

 side 5. 



Measurements. — 



U.S.N.M. 

 F., para- 

 type No. 

 18970 



Length of head 



Length of body 



Length of tail 



Total length 



Width of head over orbits 



Mm. 



40 

 155 

 330 

 525 



23 



Coloration. — The general color of this species is olive green, lightly 

 washed with vermilion and reticulated with brown and black. The 

 flanks are heavily washed with vermilion. There are eight black 

 blotches on the vertebral line, separated by areas paler than the gen- 

 eral tint. All of the blotched markings are small and are more pro- 

 nounced on the lobes making up the dorsal crest. Laterally they are 

 represented by small blackish brown spots, but as they encircle the 

 body they become conspicuous black bands. The transverse gular 

 fold is heavily marked with black. There is a conspicuous black 

 blotch bordering on the dorso-caudal margin of the tympanum. The 

 tail is ringed with alternate wide bands of brown and yellow. 



Remarlcs. — A half-grown female. Cat. No. 18970, U.S.N.M. (same 

 data as above), agrees with the type in all specific characters, but 

 varies slightly in one or two minor details. The first and second 

 whorls of spinous scales on the tail are separated from each other by 

 four rows of small flat scales ; the second, third, and fourth by five 

 rows; the fourth, fifth, and sixth by four rows; the sixth, seventh, and 

 eighth by three well-defined rows and a partial fourth row ; the eighth, 

 ninth, and tenth by three distinct rows: the remainder of the tail 

 exactly as the type. The femoral pores as 7-7. Dorsal spines 75. 



Three specimens in the British Museum of Natural History, labeled 

 from Tres Marias, Nayarit, vary slightly in the precise number and 

 arrangement of the caudal scales, but agree with the type in all 

 specific characters. They are designated as paratypes. 



