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



64553) on San Esteban Island, near Tiburon Island (A. M. N. H. No. 

 2278, U. S. N. M. Nos. 64439, 64551-2), and Lower California (A. M. N. 

 H. Nos. 5639-41, 5657-8, U. S. N. M. Nos. 64440, 64557-9). 



Specimens in the National Museum, collected by the Biological 

 Survey Expedition, are from Santa Anita (U. S. N. M. Nos. 37578-9), 

 Cape San Lucas (37580-81), and San Jose del Cabo (37582). 



Dickerson, 1919, loc. cit., has named two insular species from San 

 Esteban and Ceralvo Islands, on the basis of this material. Upon care- 

 ful examination of the types and paratypes, I am unable to maintain 

 their validity even as insular races. The difference in proportions 

 between the two new forms (loc. cit., p. 462) appears to be due to the fact 

 that several of the San Esteban specimens are more or less shrunken 

 from too strong alcohol, while the Ceralvo specimens are females, con- 

 sequently with somewhat stockier bodies. Furthermore, the records 

 now available do not indicate that all of these specimens are actually 

 from the islands to which they are ascribed by Dickerson; the localities 

 assigned above are from the department catalogue. 



The tails of the older males are nearly always more or less injured. 

 The regenerated portion is covered with sharply keeled scales, which 

 are, however, scarcely spinose and not arranged in whorls. 



The stomach of A. M. N. H. No. 5641 was entirely filled with the 

 flowers of a leguminous plant. 



Dipso-saurus dorsalis lucasensis Van Denburgh 

 Dipso-saurus dorsalis lucasensis Van Denburgh, 19206, p. 33. 



Range. — Cape region of Lower California. 



Lower Californian Records. — La Paz, Cape St. Lucas, Yarrow, 1882, p. 54; 

 San Luis Gonzales Bay, Townsend, 1890, p. 144; San Jose del Cabo, Magdalena 

 Island, Comondu to San Quentin, Miraflores, Van Denburgh, 1895, p. 92; San Ignacio 

 Mocquard, 1899, p. 301; San Pedro, Triunfo, San Bartolo, Buena Vista, Santiago, 

 Agua Caliente, Todos Santos, Van Denburgh and Slevin, 1921a, p. 56. 



Like Van Denburgh, I am unable to find any difference between 

 Cape specimens of this species and those from Arizona, except the 

 difference in the scales between rostral and nasal in which the sixteen 

 specimens collected by the Albatross Expedition agree excellently with 

 those of the California Academy of Sciences. The localities represented 

 in the collection of the Albatross Expedition are San Jose del Cabo 

 (A. M. N. H. Nos. 5552-4, 5556-7, U. S. M. N. Nos. 64543, 64547-50), 

 Miraflores (A. M. N. H. No. 5663, U. S. N. M. Nos. 64544-6), and 

 Santa Catalina Island (A. M. N. H. No. 5548). The specimen from 



