844 13. COLUBRIDZ 
Eutenia elegans couchii Core, 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 Densurcu, Proc. Cal. Acad. Sci., Ser. 2, 
Vol. V, 1896, p. 1008; Van Densurou, Occas. Papers Cal. Acad. 
Sci., Vol. V, 1897, p. 212 (part); McLain, Critical Notes, 1899, 
p- 12 (part); GrinneLtL & GRINNELL, Throop Inst. Bull., No. 
XXXV, 1907, p. 49; GRINNELL, Univ. Cal. Publ. Zool., Vol. 5, 
No. 1, 1908, p. 167; Ruruven, Bull., U. S. Nat. Mus., No. 61, 
1908, p. 133 (part); Van Densurcu, Proc. Cal. Acad. Sci., Ser. 4, 
Vol. III, 1912, pp. 149, 150, 151, 152; Hurrer, First Ann. Rep. 
Laguna Marine Lab., 1912, p. 67; Arsarr, Univ. Cal. Publ. Zool., 
Vol. 12, No. 3, 1913, p- 43; STEJNEGER & Barsour, Check List 
N. Amer. Amph. Rept., 1917, p. 101 (part). 
Tropidonotus digueti Mocquarp, 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 Grinnevt & Camp, Univ. Cal. Publ. 
Zool., Vol. 17, No. 10, 1917, p. 181 (part); Van Densurcu & 
Stevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. VIII, 1918, p. 256, pl. 
13; Cowxgs, Journ. Entomol. & Zool., Pomona College, Vol. XII, 
No. 3, 1920, p. 66; StepHENS, Trans. San Diego Soc. Nat. Hist., 
Vol. III, No. 4, 1921, p. 63; Van Denpurcu & Stevin, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. XI, 1921, p. 52; Netson, 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 prefrontals, 
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 11) inferior 
labials, sixth in each series largest, fourth and fifth superior 
