1919] Dickerson, Diagnoses of New Species and <> New (lenus of Lizards 475 



It is always unfortunate that a species should be described from 

 one specimen only, especially in Cnemidophorus where evolution of the 

 color pattern, both the method, and time in the developmental history 

 of the lizard, furnishes one of the strongest diagnostic characters. A series 

 of specimens from San Esteban is needed before a complete diagnosis 

 of the color pattern can be given. 



21. Cnemidophorus punctilinealis, 1 new species 



Type.— A. M. N. H. No. 5532, adult, <?. Collector C. H. Townsend, Albatross 

 Expedition, April 12, 1911. 



Paratypes. — A. M. N. H. Nos. 5526, 5535, 5533 (immature to adult, showing 

 development of color pattern), also A. M. N. H. Nos. 5528-5531, 5534, 5536-5539. 



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



Diagnosis. — A teiid lizard of medium size, the largest specimen in a collection of 

 13, measuring 335 mm. (with tail about two-thirds the total length); closely related 

 to C. melanostethus Cope. It has relatively uniform dorsal scutellation, abdominal 

 ventrals in 8 longitudinal rows, frontoparietals separate, nostril anterior to nasal 

 suture. The nasal is not in contact with the second supralabial; scales on posterior 

 neck fold scarcely exceeding largest at center of gular region, 1-2 rows very small at 

 extreme margin; 4 supraoculars; there are 7 femoral rows of enlarged scales, 3 tibial, 

 6 brachial, 2 antebrachial (with part of a third proximally), the superior antebrachial 

 row and anterior tibial row extremely large; underside of forearm has scales along 

 median line scarcely enlarged; femoral pores 20. 



The final stage in the development of the color pattern gives an arrangement, 

 from ventral scales to ventral scales, of 11 quite regular longitudinal rows of closely 

 set minute black spots (dots, 1-5 granules large), on an olivaceous background lighter 

 laterally — without trace of longitudinal lines or bands; the dots continue over the 

 dorsal surface of the extremities, and are carried forward in more irregular arrange- 

 ment and greater size over the sides of the head and the gular region, sometimes over 

 the dorsal head; the breast, undersurface of arms, and the posterior gular fold are 

 blackish in the male, often anterior gular region also black; the same linear arrange- 

 ment of dots may extend conspicuously nearly one-half the length of the tail; re- 

 mainder of ventral surfaces (except tibias and feet) light to dark bluish gray, with 

 the ventrals black-margined and a double series of black spots occupying the mid- 

 ventral caudal line; tail reddish to purplish brown distally. 



Immature with 4 equidistant longitudinal light lines dorsally, between each two 

 of which appears an irregular more or less double series of minute light spots; spots 

 and vertical bars of lighter color closely cover the sides and extend forward on sides 

 of head and gular region. By a process involving an increase in width of the irregular 

 light spots of the back until they meet the light dorsal lines, 3 series of broader than 

 long, small, pigmented bars are left. By reduction of these in size and crosswise 

 division of the lateral bars (2 rows on each side) the adult pattern of 11 longitudinal 

 rows of black dots comes into existence. 



'With reference to the adult color pattern of dots which follow one another in close series. 



