40. THAMNOPHIS 8+9 



191. Thamnophis marcianus (Baird & Girard) 



Marcv's Garter-Snake 



Plate 93 



Eutainia marciana Baird & Girard, Cat. N. Amer. Rept., Pt. I, 1853, 

 p. 36 (type locality, "Red River, Arkansas" = near Cache 

 Creek, Ok'ahoma). 



Eiitania marciana Baird, U. S. Mex. Bound. Surv., Vol. II, Rept., 

 1859, p. 17; Cope, Bull. U. S. Nat. Mus., No. i, 1875, P- 4'; Yar- 

 row, Bull. U. S. Nat. Mus., No. 24, 1883, p. 118 (part). 



Eutania nigrolateralis Brown, Proc. Acad. Nat. Sci. Phila., 1889, p. 

 421 (type locality, Tucson, Arizona). 



Tropidonotus ordinatus var. marcianus Boulenger, Cat. Snakes Brit. 

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



Eutania elegans marciana Cope, Report U. S. Nat. Mus., 1898 (1900), 

 p. 1044; Brown, Proc. Acad. Nat. Sci. Phila., 1901, p. 24; Bailey, 

 N. Amer. Fauna, No. 25, 1905, pp. 28, 48; Ditmars, Reptile Book, 

 1907, p. 229, pis. LXVI, figs. 2, 7, LXX, fig. 2. 



Thamnophis marciana Ruthven, Bull. Am. Mus. Nat. Hist., Vol. XXIII, 

 1907, p. 589. 



Thamnophis marcianus Ruthven, Bull. U. S. Nat. Mus., No. 61, 1908, 

 p. 58; Van Denburgh, Proc. Cal. Acad. Sci., Ser. 4, Vol. Ill, 

 1912, p. 154; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., 

 Ser. 4, Vol. Ill, 1913, p. 420; Grinnell & Camp, Univ. Cal. Publ. 

 Zool., Vol. 17, No. 10, 1917, p. 179; Stejneger & Barbour, Check 

 List N. Amer. Amph. Rept., 191 7, p. loi; Van Denburgh & 

 Slevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. VIII, No. 6, 1918, p. 261, 

 pi. 14. 



Descriftion. — Head distinct from neck, flat-topped, 

 with narrow, rounded snout, and temporal regions some- 

 times swollen. Eye moderate. Rostral large, bounded be- 

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

 Plates on top of head: a pair of internasals, a pair of pre- 

 frontals, a frontal, supraocular of each side, and a pair of 

 parletals. Anterior and posterior nasals distinct. One loreal. 

 One or rarely two preoculars. Three or four postoculars. 

 Temporals normally one followed by two or three, some- 

 times 2+3. Eight, (rarely seven) superior and 10 (rarely 



