202 BULLETIN 154, UNITED STATES NATIONAL MUSEUM 



Data based on 37 specimens of rubidus, including its cotypes and 

 the type of vandenhurghi have been summarized as follows: Body, 

 48-103 mm.; tail, 128-270; total length, 180-371; length of tail 

 as percentage of total length, 67.2-75.0; width of head, 8.5-16.5; 

 width of head as percentage of body length, 11.8-17.8; hind leg, 

 33-65; length of hind leg as percentage of body length, 61.0-78.5; 

 frontoparietals 2 in 35 specimens, 3 in 1 specimen, and 4 in 1 speci- 

 men; supraocular granules extending forward to the middle of the 

 third supraocular in 30 specimens, to the posterior border of the 

 second supraocular in 6 specimens, and to the middle of the second 

 supraocular in 1 specimen. 



The j)osterior supraocular (fourth) is very small in several speci- 

 mens, including one (C.A.S. No. 56051) from Santa Margarita 

 Island and one (U.S.N.M. No. 64449) from Carmen Island. The 

 latter specimen is the type of vandenhurghi. 



Range. — Rubidus is confined to southern Lower California. Some 

 discussion concerning the range of this form is included under this 

 heading of celeHpes (p. 204). 



The available records are as follows: {Gofr'nien Island., Dickerson, 

 1919, p. 477, U.S.N.M., C.A.S. ; Comondu, Van Denburgh, 1895, p. 

 128; ConcepcioTh Bay, Van Denburgh, 1922, p. 549, C.A.S.; Danzante 

 Island, Van Denburgh, 1922, p. 549, C.A.S. ; Magdalena Island, Van 

 Denburgh, 1895, p. 128, C.A.S.; Mulege, Mocquard, 1899, p. 315: 

 Santa Margarita Island, Cope, 1892c, p. 36, U.S.N.M., C.A.S.). 



Intergrades with tessellatus have been found on Sa7i Marcos Island 

 (Van Denburgh, 1922, p. 549, C.A.S.), and more are to be expected 

 on the mainland somewhere south of here. 



Hahitat and hahits. — Nothing has been published concerning the 

 habitat and habits of this subspecies. 



A-fflnities. — Riibidus is obviously closely related to tessellatus, from 

 which it is only slightly differentiated, and with which it intergrades 

 in the northern part of its range. Judging from this approach and 

 its peripheral position it is likely that ruhidus was derived directly 

 from tessellatus in recent geological times. A detailed discussion of 

 this relationship will be found under celeripes (p. 205). 



CNEMIDOPHORUS TESSELLATUS CELERIPES (Dickerson) 



SAN JOSE ISLAND WHIPTAIL 



I!ll9. (Uicmidophorus celeripes Dickekson, Bull. Anier Mus. Nat. Hist., vol. 41, 

 p. 472 (type locality, " Sau Jose Island, Gulf of California, Mexico"; typo 

 specimen, U.S.N.M. No. 64444, O. H. Townsend, collector).— Van Denburgh. 

 Occas. Pap. Calif. Acad. Sci., vol. 10, 1922, p. 549.— Nelson, Mem. National 

 Acad. Sci., vol. 21, 1922, p. 114.— Schmidt, Bull. Amer. Mus. Nat. Hist., vol. 

 46, 1922. p. 675. — Stbjnegek and Barbour, Check I^ist N. A. Aniph. and Kept., 

 od. 2, 192.",, p. 70. 



