1922] Schmidt, Amphibians and Reptiles of Lower California 669 



The close relation of this species to P. cerroense, its nearest neighbor 

 geographically, is especially evident in the arrangement of the spines of 

 the head ; from the figure of the type of cerroense it appears that jamesi 

 has a much more truncate muzzle. The two are readily distinguishable 

 by the absence of the ventral lateral fringe in cerroense. 



As cerroense was considered intermediate between blainvillii and 

 coronation by Stejneger (1893, p. 187) and Cope (1900, p. 430), it is evi- 

 dent that the present form, with its two lateral fringes, is much more 

 nearly intermediate between them and that cerroense is to be regarded as 

 divergent from a stock similar to jamesi. Our knowledge of the distribu- 

 tion of the four Lower Californian species, blainvillii, nelsoni, jamesi, 

 and coronatum is very inadequate. It is not at all unlikely that nelsoni 

 may prove to be a third subspecies of blainvillii. P. jamesi and coronatum, 

 however, appear to be sufficiently distinct to preclude any possibility of 

 their intergradation. It would be highly interesting to know if the 

 species of Phrynosoma in Lower California really have a restricted 

 distribution, with wide areas where they are absent, as might be inferred 

 from the present information regarding them. 



Phrynosoma cerroense Stejneger 

 Phrynosoma cerroense Stejneger, 1893, p. 187; Stejneger and Barbour, 1917, p. 

 58. 

 Range. — Confined to Cedros Island, off the Pacific coast of Lower California. 



Phrynosoma coronatum (Blainville) 

 Plate LIV, Figure 1 

 Agama (Phrynosoma) coronatum Blainville, 1835, p. 284, PI. xxv, fig. 1. 

 Phrynosoma coronatum Stejneger and Barbour, 1917, p. 58. 



Range. — Southern Lower California. 



Lower Californian Records. — Cape St. Lucas, Cope, 1866a, p. 312; La Paz, 

 Yarrow, 1882, pp. 67-68; Comondu to San Quentin, Poso Grande, San Jose del 

 Cabo, San Francisquito (Sierra Laguna), and Miraflores, Van Denburgh, 1895, 

 p. 115; Santa Anita, McLain, 1899, p. 2; Santa Rosalia, San Ignacio, and Mulege, 

 Mocquard, 1899, p. 314; Todos Santos, Pescadero, Agua Caliente, Triunfo, and 

 San Pedro, Van Denburgh and Slevin, 1921a, p. 62. 



Three specimens of P. coronatum were secured by the Albatross 

 Expedition, from Miraflores (A. M. N. H. Nos. 5499, 5701) and San Jose 

 del Cabo (U. S. N. M. No. 64465). A fourth is contained in a small col- 

 lection with the general locality "La Paz" received from the Museo 

 Xacional de Mexico. 



Five specimens in the Biological Survey collection come from 

 Matancita (U. S. N. M. Nos. 37586-90). 



