1919] Dickerson, Diagnoses of New Species and a New Genus of Lizards 465 



formation of posterior spine; dorsals small, larger in mid-dorsal region especially 

 anteriorly, rows in head length near median line 28, 15 mm. distant from median 

 line, 37; number of ventral scale rows from gular fold to anus, 143 (average in 15 

 specimens) ; scales around thickest part of tail, 72 (average in 15 specimens) ; femoral 

 pores not variable, averaging 17. General color light yellowish to light reddish brown, 

 with irregular blotching and mottling of dark over all dorsal and lateral surfaces, 

 giving a piebald appearance. 



Measurements of the Type. — Total length, 547 mm.; head and body to anus, 

 250; tail length, 297; tip of muzzle to posterior margin of ear, 58, to gular fold, 84; 

 head width, 58; hind leg, 155; foot, 70; base of 5th to end of 4th toe, 54. 



6. Callisaurus carmenensis, new species 



Type.— A. M. N. H. No. 5388, d" . Collector, C. H. Townsend, Albatross Ex- 

 pedition, April 2, 1911. 



Paratype — A. M. N. H. No. 5389, 9 . 



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



Diagnosis. — A small Callisaurus rather closely related to C. plasticus, new 

 species, but with finer scutellation throughout, especially noticeable in dorsals, 

 scales forming denticulated margin of gular fold, on chest posterior to gular fold, 

 inferior shoulder patches of enlarged scales, and tibials; femoral pores variable, 

 averaging 14. Blue lateroventral area very small changing to purplish brown 

 posteriorly; black lateroventral bands obscure, short and narrow, parallel, somewhat 

 curved; tail black-spotted below only. 



Measurements of the Type. — Head and body to anus, 62 mm.; tail length, 58 + 

 ( reproduced) ; tip of muzzle to posterior margin of ear, 16, to gular fold, 21; head 

 width, 13; hind leg, 62; hind foot, 30; base of 5th to end of 4th toe, 26. 



7. Callisaurus inusitatus, 1 new species 



Type.— A. M. N. H. No. 5324, <J. Collector, C. H. Townsend, Albatross Expedi- 

 tion, April 13, 1911. 



Paratypes.— A. M. N. H. Nos. 5317-5337, 5339-5341, 5344-5346, 5397. 



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



Synonyms. — Callisaurus draconoides ventralis (part), Cope, 1898 (1900), Rept. 

 U. S. Nat. Mus., p. 273; Callisaurus ventralis ventralis (part), Stejneger and Bar- 

 bour, 1917, Check List, p. 47. 



Diagnosis. — Size large, adults often exceeding 200 mm. total length. Hind 

 leg equal to or longer than distance from snout to anus, reaching beyond muzzle 

 when stretched forward along body; femoral pores, 18 (average of 29 specimens). 

 Black lateral bands, 2; very oblique forward, long but variable in width, irregular 

 in outline; usually obscurely marked, united inferiorly along the margin of the blue 

 area, producing between them a conspicuous U-shaped blue spot below the lateral 

 fold. Blue lateroventral area prominent and extending nearly to groin. Ventral 

 tail white with 6-9 black crossbands; dorsal caudal surface brown with markings 

 brown not black. 



With reference to the union inferiorly of the black lateroventral bands, unknown in any other 

 species of Callisaurus or in Holbrookia. 



