844 13. COLUBRIDSE 



Eutania elegans couchii COPE, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 

 656; COPE, Report U. S. Nat. Mus. for 1898, 1900, p. 1042 (part). 



Tropidonotus ordinatus var. hammondii BOULENGER, Cat. Snakes Brit. 

 Mus., Vol. I, 1893, p. 210. 



Thamnophis hammondii VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, 

 Vol. V, 1896, p. 1008; VAN DENBURGH, Occas. Papers Cal. Acad. 

 Sci., Vo'. V, 1897, p. 212 (part); McLAiN, Critical Notes, 1899, 

 p. 12 (part); GRINNELL & GRINNELL, Throop Inst. Bull., No. 

 XXXV, 1907, p. 49; GRINNELL, Univ. Cal. Publ. Zool., Vol. 5, 

 No. i, 1908, p. 167; RUTHVEN, Bull., U. S. Nat. Mus., No. 61, 

 1908, p. 133 (part); VAN DENBURGH, Proc. Cal. Acad Sci., Ser. 4, 

 Vol. Ill, 1912, pp. 149, 150, 151, 152; HURTER, First Ann. Rep. 

 Laguna Marine Lab., 1912, p. 67; ATSATT, Univ. Cal. Publ. Zool., 

 Vol. 12, No. 3, 1913, p. 43; STEJNEGER & BARBOUR, Check List 

 N. Amer. Amph. Rept., 1917, p. 101 (part). 



Tropidonotus digueti MOCQUARD, Nouv. Arch, du Museum d'Hist. 

 Naturelle, Ser. IV, Vol. I, 1899, p. 327 (type localities, Mulege & 

 San Ignacio, Lower California, Mexico). 



Thamnophis ordinoides hammondii GRINNELL & CAMP, Univ. Cal. Publ. 

 Zool., Vol. 17, No. 10, 1917, p. 181 (part); VAN DENBURGH & 

 SLEVIN, Proc. Cal. Acad. Sci., Ser. 4, Vol. VIII, 1918, p. 256, pi. 

 13; COWLES, Journ. Entomol. & Zool., Pomona College, Vol. XII, 

 No. 3, 1920, p. 66; STEPHENS, Trans. San Diego Soc. Nat. Hist., 

 Vol. Ill, No. 4, 1921, p. 63; VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. XI, 1921, p. 52; NELSON, Mem. Nat. Acad. 

 Sci., Vol. XVI, 1921, pp. 114, 130. 



Description. Head distinct from neck, flat-topped, with 

 narrow, rounded snout, and temporal regions not infre- 

 quently swollen. Eye large. Rostral large, bounded behind 

 by internasal, anterior nasal, and first labial plates. Plates 

 on top of head: a pair of internasals, a pair of pref rentals, 

 a frontal, supraocular of each side, and a pair of parietals. 

 Anterior and posterior nasals distinct. One loreal. One or 

 two or three preoculars, and three (rarely four or two) post- 

 oculars. Temporals one followed by two or three. Eight 

 (rarely nine) superior and ten (rarely nine or 1 1 ) inferior 

 labials, sixth in each series largest, fourth and fifth superior 



