684 Bulletin American Museum of Natural History [Vol. XL VI 



The Albatross collection contains thirteen specimens of this form, 

 the following localities being represented: Cape San Lucas (A. M. N. H. 

 Nos. 5584, 6890); Miraflores (A. M. N. H. Nos. 5585, 5600-6503, U. S. 

 N. M. Nos. 64591-5); and San Bartolome Bay (U. S. N. M. No. 64590). 



The specimens range in size from 887 mm. to 1780 mm. The dorsal 

 scale formula is regularly 19-17-13, but may be 19-17-12 by the loss of 

 the median scale row posteriorly (U. S. N. M. Nos. 64590-91). There 

 does not appear to be any sex difference in the number of ventral plates 

 or subcaudals, nor in the proportionate length of the tail. In scale char- 

 acters, this series does not change the range of variation shown in the tab- 

 ulation of Van Denburgh (1921a, loc. tit.). 



Specimens in the Biological Survey collection come from San Felipe 

 Bay (U. S. N. M. No. 37549), Trinidad Valley (37551), Ojos Negros 

 (37559), and San Ignacio (37552-3). Two of these (37559 and 37552) 

 are of the dark color phase originally described as piceus. They corre- 

 spond so closely in coloration to the specimen in the Albatross collection 

 from San Bartolome Bay, and this in turn with Cope's description of C. 

 lateralis fuliginosus from Santa Margarita Island, that I am convinced 

 of their identity. 



Two specimens, U. S. N. M. Nos. 37549 and 37559, show very dis- 

 tinct light lateral lines on the anterior third of the body, indicating, I be- 

 lieve,, the relation of this form with C. tseniatus. 



Coluber lateralis (Hallowell) 



Leptophis lateralis Hallowell, 1853. p. 237. 



Coluber lateralis Stejneger and Barbour, 1917, p. 80. 



Range. — Southern and Lower California, absent from the Cape area. 



Lower Californian Records. — Santa Rosalia, Mulege, San Ignacio, Mocquard, 

 1899, p. 324. 



I refer Mocquard's records of C. taeniatus to this species, although it is 

 entirely possible that they may prove to represent a distinct peninsular 

 form or that they may be more nearly related to C. barbouri from Espiritu 

 Santo Island. 



Coluber aurigulus (Cope) 



Drymobius aurigulus Cope, 1861, p. 301. 



Coluber aurigulus Stejneger and Barbour, 1917, p. 78. 



Range. — Southern Lower California. 



Lower Californian Records. — Cape St. Lucas, Cope, 1861, p. 301; San Jose 

 del Cabo, Van Denburgh, 1895, p. 149. 



