466 Bulletin American Museum of Natural History [Vol. XLI 



Measurements of the Type. — Length of head and body to anus, 93 mm.; tail 

 length, 109; tip of muzzle to posterior margin of ear, 19, to denticulated gular fold, 

 27; head width, 15; hind leg, 80; hind foot, 37; base of 5th to end of 4th toe, 32. 



I have what seems to be this species (female specimen only) also 

 from Guaymas, Sonora, Mexico, in the W. W. Brown collection loaned 

 for study by the Museum of Comparative Zoology. C. inusitatus may 

 possibly intergrade with C. ventraJis ventralis (Hallowell) somewhere in 

 Sonora. 



8. Callisaurus plasticus, 1 new species 



Type.— A. M. N. H. No. 5349, &. Collector, C. H. Townsend, Albatross 

 Expedition, April 1, 1911. 



Paratypes.— A. M. N. H. Nos. 5308-5316, San Josa Island, Nos. 5346^5348, 

 5350, Aqua Verde Bay, Nos. 5357-5368, Mulege, Nos. 5351-5356, Concepcion Bay 

 (south end), Nos. 5381-5387, San Francisquito Bay, Lower California. 



Type Locality. — Aqua Verde Bay, Lower California, Mexico. 



Synonym. — Callisaurus draconoides Blainville (part), Cope, 1898 (1900), Rept. 

 U. S. Nat. Mus., p. 269. 



Diagnosis. — Total length of adult seldom exceeding 170 mm. Hind leg in male 

 about equal to length from snout to anus, extending considerably beyond the muzzle 

 when stretched forward along body. Tail much longer than distance from snout to 

 anus. Number of femoral pores highly variable, 13-19, averaging 15 (39 specimens). 

 An irregular broad band of blue below the lateral fold from just posterior to axilla 

 nearly to the groin; in this two black bands, straight, oblique forward, extending 

 some distance on to the dorsolateral surface, narrowed where they cross the lateral 

 fold and more or less broadened and rounded at their inferior ends (shape of bands 

 extremely variable, the second may have extension toward groin) ; dorsal caudal 

 surface in male without black bands. 



Measurements of the Type. — Total length, 159 mm.; head and body to 

 anus, 64; tail length, 95; tip of muzzle to posterior margin of ear, 16, to gular fold, 

 21; head width, 12.5; hind leg, 63; hind foot, 31; base of 5th to end of 4th toe, 25. 



This species very possibly, in fact probably, intergrades with Calli- 

 saurus ventralis ventralis (Hallowell) north of the middle of the length of 

 the Gulf side of the peninsula. I have no specimens, however, from 

 localities where anything more than great variability in the southern 

 species is shown. Heretofore, Callisaurus plasticus, new species, has 

 been confused with Callisaurus draconoides Blainville. Cope's descrip- 

 tion is mainly from a specimen of the former, his drawings from a 

 specimen of the latter. C. draconoides Blainville is limited to the Cape 

 Region. 



■From plasticus, " fit for molding," with reference to the variable character of the species, especially 

 conspicuous in the shape of the black lateroventral bands. 



