92 



CALIFORNIA ACADEMY OF SCIENCES. 



DiPSOSAURUS DORSALIS (B. & G.) 



Crotaphytus dorsalis. 



(1852, Baird and Girard, Proc. Ac. Nat. Sci. Phila., p. 126.) 



Dipsosaurus dorsalis. 



1859, Baird, Proc. Ac. Nat. Sci. Phila., p. 299. 

 (1866, Cope, Proc. Ac. Nat. Sci. Phila., p. 312.) 

 (1875, Cope, Bull. U. S. Nat. Mus., No. 1, p. 48.) 

 (1880, Lockington, Am. Nat., xiv, p. 295.) 

 1883, Yarrow, Bull. U. S. Nat. Mus., No. 24, p. 54. 

 (1885, Boulenger, Cat. Lizards Brit. Mus., ii, p. 201.) 

 (1887, Cope, Bull. E. S. Nat. Mus., No. 32, p. 34.) 

 (1887, Belding, West Am. Scientist, iii, 24, p. 97.) 

 1890, Townsend, Proc. U. S. Nat. Mus., p. 144. 

 (1893, Stejneger, N. A. Fauna, No. 7, p. 164.) 



Specimens of this lizard from the "Cape Region" show 

 a tendency to have but one row of scales between the 

 rostral and nasal plates, while those from northern Lower 

 California and California more frequently have two rows. 

 The following table, based upon two hundred and thirty- 

 one specimens shows this quite plainly:'^ 



Number of scale rows between rostral and nasal 



2-2 



2-1 



1-1 



Northern specimens 



Specimens from the " Cape Eegion " 



19 

 14 



9 

 6 



13 

 170 



This appears to be the only difference, and is not con- 

 stant enough to warrant recognition by name. 



The species has been recorded from Cape San Lucas 

 (XanUis), La Paz (Belding), and San Luis Gonzales 

 Bay (Townsend), in Lower California. 



* Dr. Leonhard Stejneger kindly furnished me notes on forty of these 

 specimens, which are in the U. S. National Museum. 



