28. COLUBER 683 
150. Coluber aurigulus (Cope) 
Cape San Lucas Racer 
Drymobius aurigulus Cope, Proc. Acad. Nat. Sci. Phila., 1861, p. jor 
(type locality, Cape St. Lucas, Lower California). 
Bascanium aurigulum Corer, Bull. U. S. Nat. Mus., No. 1, 1875, pp. 
40, 92; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, pp. 113, 
191; Cope, Bull. U. S. Nat. Mus., No. 32, 1887, p. 71; BELDING, 
West Amer. Scientist, Vol. III, No. 24, 1887, p. 99. 
Coluber flagelliformis var. aurigulus Garman, Mem. Mus. Compr. Zool., 
Cambr., Vol. VIII, No. 3, 1883, pp. 44, 148; Garman, Bull. Essex 
Inst., Vol. XVI, No. 1, 1884, p. 26. 
Bascanion laterale aurigulum Cope, Proc. U. S. Nat. Mus., Vol. XIV, 
1892, p. 629. 
Bascanion aurigulum Van DensBuracH, Proc. Cal. Acad. Sci., Ser. 2, 
Vol. 5, 1895, p. 149. 
Zamenis aurigulus Cope, Report U. S. Nat. Mus., for 1898, 1900, p. 
810, fig. 179; TeErRRon, Mem. y Rev. Soc. Cient. Antonio Alzate, 
Vol. 39, 1921, p. 164. 
Coluber aurigulus SrEJNEGER & Barsour, Check List N. Amer. Amph. 
Rept., 1917, p. 78; Van DensBurcu & Stevin, Proc. Cal. Acad. 
Sci., Ser. 4, Vol. XI, 1921, p. 52; Netson, Mem. Nat. Acad. Sci., 
Vol. XVI, 1921, pp. 114, IIS. 
Description —Head long, with flattened top and narrow, 
rounded snout. Rostral rather large, about as high as 
broad, hollowed below, and bounded behind by internasal, 
anterior nasal, and first labial plates. Plates on top of head 
are a pair of internasals, a much larger pair of prefrontals, 
supraocular and part of preocular of each side, a long frontal 
very narrow posteriorly, and a pair of very large parietals. 
Anterior and posterior nasals distinct. Loreal large and elon- 
gate. Preoculars three, the upper largest. Postoculars 
two. Temporals two followed by two, or 1+2. Suprala- 
bials eight, fourth and fifth reaching eye, seventh and eighth 
largest. Infralabials ten, fifth largest, first pair meeting 
on median line. Genials in two pairs, posterior longer. 
Scales on body smooth, in 17 rows. Anal plate divided. 
