19191 Dickerson, Diagnoses of New Species and a New Genus of Lizards All 



23. Cnemidophorus vandenburghi, 1 new species 



Type.— A. M. N. H. No. 5521. Collector, C. H. Townsend, Albatross Expedi- 

 tion, April 2, 1911. 



Type Locality. — Carmen Island, Gulf of California, Mexico. 



Diagnosis. — A small species related to Cnemidophorusrubidus (Cope) and Cnemi- 

 dophorus celeripes, new species. Nasal not in contact with the second supraocular; 

 posterior of the 4 supraoculars extremely small; all of the collar scales small except 

 6-10 at the middle, 2 or 3 of which may exceed the central anterior gulars. Brachials, 

 5-6, antebrachials, 3 (exterior row conspicuously broad), scales on underside of fore- 

 arm posterior aspect somewhat enlarged; femorals, 6-7, tibials, 3; femoral pores, 21. 



Head brown, not conspicuously spotted, gular region yellow, cross-banded with 

 black and bright blue. Olivaceous dorsally, with 4 longitudinal light stripes between 

 the temporal angles (alternating with longitudinal series of black and olive spots or 

 bars), 6 longitudinal light stripes, counting the one stretching from postauricular area 

 to groin on each side; median space between the two mid-dorsal light stripes twice as 

 broad as the other spaces ; black spots very irregular in shape, not opposite each other 

 in the dorsal rows, and the whole effect of the pattern one of confused and crowded 

 elements (in contrast with rubidus and celeripes); black lateral markings more 

 nearly opposite than the dorsal, more regular in size and shape; pattern reduced on 

 nape and rump. Bright blue ventrally on breast and abdomen without spots or 

 stripes, also bright blue laterally on head, body, extremities, and tail; no spots or 

 stripes on ventral surfaces of extremities and tail; dorsal caudal surface red distally 

 and ventral surface red for the whole length. 



Measurements of the Type. — Total length, 217 mm.; head and body to anus, 

 65; tail length, 152; tip of muzzle to gular fold, 24.5, to anterior ear, 17, posterior 

 ear, 19, to posterior margin of interparietal, 17.5, to axilla, 31 ; head width at posterior 

 orbital angles, 10, anterior orbital angles, 7; hind leg, 42; 4th toe to base of 5th, 21.5. 



'Named for Dr. John Van Denburgh, of the California Academy of Siences, whose name is 

 more elosly connected with the herpelology work in Lower California than that of any other 

 herpetologist. 



