492 13. COLUBRIDZ 
course, that it was a perfectly harmless snake, its sudden 
aggressiveness combined with its horrid appearance nearly 
secured its release before I could overcome my instinctive 
repugnance. 
180. Thamnophis sirtalis parietalis (Say) 
PrarRiE GARTER SNAKE 
Coluber parietalis, Say, Long’s Exped. Rocky Mts., Vol. I, 1823, p. 186 
(type locality, West side of the Missouri River three miles 
above the mouth of Boyer’s River). 
Eutaenia parietalis Corr, Ann. Rep. U.S. Geol. Surv. Terrs., 1871 (1872), 
p- 468. 
Eutaenia ornata Yarrow, Surv. W. tooth Merid., Vol. V, 1875, p. 553. 
Thamnophis parietalis VAN Densurcu, Occas. Papers Cal. Acad. Sci., 
Vol. V, 1897, p. 200 (part); Ertis & Henperson, Univ. Colorado 
Studies, Vol. X, No. 2, 1913, p. 86, pl. IV, fig. 19; Ertis & Hen- 
pERSON, Univ. Colorado Bull., Vol. XV, No. 6, 1915, p. 261. 
Eutaenia sirtalis parietalis Tayuor, Ann. Rep. Nebr. State Board Agric. 
for 1891, 1892, p. 325; Cope, Report U. S. Nat. Mus. for 1898, 
1900, p. 1077 (part); Branson, Kansas Univ. Sci. Bull., Vol. H, 
No. 13, 1904, p. 366, fig. 5; Dirmars, Reptile Book, 1907, p. 237, 
pl. LX XII, fig. 1 (part). 
Thamnophis sirtalis parietalis RurHven, Bull. U. S. Nat. Mus. No. 61, 
1908, p. 166 (part); Cockerett, Univ. Colorado Studies, Vol. 
VII, No. 2, 1910, p. 131; VAN DensurcH & Stevin, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. 5, No. 4, 1915, p. 108; SreyNecER & Bar- 
3o0uR, Check List N. Amer. Amph. Rept., 1917, p. 103 (part); VAN 
Densurcu & Stevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 8, No. 6, 
1918, p. 190; RuTHVEN, Occas. Papers Mus. Zool. Univ. Michigan, 
No. 66, 1919, p. 3; VAN DensurcH & Stevin, Proc. Cal. Acad. 
Sci., Ser. 4, Vol. XI, 1921, p. 40. 
Description.—Head distinct from neck, flat-topped, with 
narrow, rounded snout, and temporal regions sometimes 
swollen. Eye large. Rostral plate 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. 
