I50 



CALIFORNIA ACADEMY OF SCIENCES. 



PiTUOPHIS VERTEBRALIS (Blainv.) 



Coluber vertehralis. 



1835, Blainville, Nouv. Ann. Mus., iv, p. 293, pi. 27, fig. 2-2b. 

 (1853, Baird and Girard, Cat. N. A. Reptiles, 1, Serpents, p. 152.) 



Pituophis vertebralis. 



1854, Dumeril et Bibron, Erpetologie Generale, vii, p. 238. 

 1888, Bocourt, Miss. Sci. an Mex., Reptiles, lie Hvr., p. 672, pi. 

 xlvii, figs. 1-ld. 



PityopMs hoematois. 



1860, Cope, Proc. Ac. Nat. Sci. Phila., p. 342. 



Pityophis melanoleucus vertebralis. 



" 1863, Jan, Elenco, sist. degli Ofidi, p. 59." 



" , Jan, Iconogr. gener. Oph., 22e livr., pi. 1, fig. 3." 



Pityophis vertebralis. 



(1875, Cope, Bull. U. S. Nat. Mus., No. 1, pp. 39, 92.) 

 1883, Yarrow, Bull. U. S. Nat. Mus., No. 24, p. 107. 

 (1884, Garman, Bull. Essex Inst, xvi, p. 27.) 

 (1887, Cope, Bull. U. S. Nat. Mus., No. 32, p. 72.) 

 (1887, Belding, West Am. Scientist, iii, 24, p. 98.) 

 (1892, Cope, Proc. U. S. Nat. Mus., 1891, p. 642.) 



PityopMs catenifer. 



(1883, Garman, Mem. Mus. Compr. Zool. Cambr., viii, 3, pp. 52, 

 150 [part].) 



Professor Cope's description (Proc. Ac Phila., i860, 

 p. 342) gives a good idea of this species. Many of the 

 scales of the red dorsal blotches have blackish centers, 

 varying in extent in different specimens. The anterior 

 urosteges are frequently undivided. The following table 

 shows the variability of the scale characters. The speci- 

 mens mentioned in it are all from San Jose del Cabo. 



Scale 



Smooth 

 scale 

 rows . 



Pre- 



Preoc- 



Postoc- 



Supra- 



Infra- 



Gastro- 



Uro- 



rows. 



frontals . 



ulars. 



ulars . 



labials. 



labials. 



steges. 



steges 



35 



12 



4 



2-2 



3-3 



8-9 



13-13 



239 



64 



35 



8-10 



4 



2-2 



3-3 



9-9 



12-12 



243 



67 



33 



13 



4 



2-2 



3-3 



9-9 



12-12 



234 



65 



34 



11 



4 



2-2 



.3-3 



9-9 



1.3-13 



251 



60 



35 



10 



4 



2-2 



3-3 



9-10 



13-13 



245 



61 



35 



10-14 



4 



2-2 



3-3 



9-9 



12-12 



233 



63 



35 



11 



2 



1-1 



3-3 



10-9 



12-12 



243 



62 



