28. COLUBER 683 



150. Coluber aurigulus (Cope) 

 CAPE SAN LUCAS RACER 



Drymobius aurigulus COPE, Proc. Acad. Nat. Sci. Phila., 1861, p. 301 



(type locality, Cape St. Lucas, Lower California). 

 Bascanium aurigulum COPE, Bull. U. S. Nat. Mus., No. I, 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. HI, No. 24, 1887, p. 99. 

 Coluber fagelliformis var. aurigulus CARMAN, Mem. Mus. Compr. Zool., 



Cambr., Vol. VIII, No. 3, 1883, pp. 44, 148; CARMAN, Bull. Essex 



Inst., Vol. XVI, No. i, 1884, p. 16. 

 Bascanion laterale aurigulum COPE, Proc. U. S. Nat. Mus., Vol. XIV, 



1892, p. 629. 

 Bascanion aurigulum VAN DENBURGH, 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; TERRON, Mem. y Rev. Soc. Cient. Antonio Alzate, 



Vol. 39, 1921, p. 164. 

 Coluber aurigulus STEJNECER & BARBOUR, Check List N. Amer. Amph. 



Rept., 1917, p. 78; VAN DENBURGH & SLEVIN, Proc. Cal. Acad. 



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



Vol. XVI, 1921, pp. 114, 115. 



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 1 7 rows. Anal plate divided. 



