+1. SONORA 859 



z\ — Snout less depressed, rounded in profile; rostral plate 

 projecting less beyond lower jaw. 

 b. — Back with a series of transverse or dark brown bars. 



S. semiannulata. — p. 863. 

 b'. — No transverse dark bars; sides with longitudinal 

 lines made up of dark dashes on the centers of the 

 scales. 



S. episcopa. — p. 866. 



194. Sonora occipitalis (Hallowell) 



Tricolor Ground Snake 



Plate 95 



Rhinostoma occipitale Hallowell, Proc. Acad. Nat. Sci. Phila., Vol. 



VII, i8s4, p. 95 (type locality, Mojave Desert). 

 Lamprosoma occipitale Hallowell, Proc. Acad. Nat. Sci. Phila., 1856, 



p. no; Baird, U. S. Mex. Bound. Surv., Vol. II, 1859, Rept., 

 p. 21, pi. 21, fig. 1; Baird, Rep. Pac. R. R. Surv., Vol. X, Pt. Ill, 

 1859, p. 16, pi. XXXV, figs. 6, 7; Hallowell, Rep. Pac. R. R. 

 Surv., Vol. X, Pt. IV, No. I, 1859, p. 15, pi. IV, figs. 2a-c; Bo- 

 couRT, Miss. Sci. au Mex., Rept., 1883, p. 558, pi. XXXIV, fig. 6. 



Lamprosoma annulatum Baird, U. S. Mex. Bound. Surv., Vol. II, 1859, 

 Rept., p. 22 (type locality, Colorado Desert). 



Chionactis occipitalis Cope, Proc. Acad. Nat. Sci. Phila., i860, p. 241 ; 

 Cooper, Proc. Cal. Acad. Sci., Vol. XIV, 1870, p. 66; Cope, Bull. 

 U.S. Nat. Mus.,No. i, 1875, p. 35; Yarrow, Bull. U.S. Nat. Mus., 

 No. 24, 1883, p. 86; Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892, 

 p. 605; Van Denburgh, Occas. Papers Cal. Acad. Sci., V, 1897, 

 p. 160; Cope, Report U. S. Nat. Mus., for 1898, 1900, p. 94I; 

 Meek, Field Columbian Mus., Zool. Ser., Vol. VII, No. i, 1906, 

 p. 15; Richardson, Science, N. S., Vol. XXXII, No. 820, 1910, 

 p. 383- 



Chionactis occipitalis annulata Cope, Bull. U. S. Nat. Mus., No. I, 

 1875, p. 36; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 86. 



Contia occipitalis Garman, Mem. Mus. Compr. Zool., Cambr., Vol. 



VIII, No. 3, 1883, pp. 91, 164; BouLENGER, Cat. Snakes Brit. 

 Mus., Vol. II, 1894, p. 266; Brown, Proc. Acad. Nat. Sci. Phila., 

 1901, p. 68; DiTMARS, Reptile Book, 1907, p. 332. 



Contia occipitalis var. annulata Garman, Mem. Mus. Compr. Zool., 

 Cambr., Vol. VIII, No. 3, 1883, pp. 91, 164. 



