12. BOIDM 



138. Lichanura trivirgata Cope 

 San Lucan Boa 



Lichanura trivirgata Cope, Proc. Acad. Nat. Sci. Phila., 1861, p. 304 

 (type locality, Cape St. Lucas, Lower California); Jan, Iconogr. 

 Gener. Oph., 2e livr., 1865, pp. 69, 70; Cope, Bull. U. S. Nat. 

 Mus., No. I, 1875, pp. 43, 93; BocouRT, Miss. Sci. au Mex., Rep- 

 tiles, 8e livr., 1882, p. 514; Yarrow, Bull. U. S. Nat. Mus., No. 

 24, 1883, p. 142; Belding, West Amer. Scientist, Vol. Ill, No. 

 24, p. 98; Cope, Bull. U. S. Nat. Mus., No. 32, 1887, p. 65; Stej- 

 NEGER, Proc. U. S. Nat. Mus., 1889, p. 98, fig. 3; Stejneger, 

 Proc. U. S. Nat. Mus., 1891, pp. 512, 514, 515; Cope, Proc. U. S. Nat. 

 Mus., 1891 (1892), p. 591; Boulenger, Cat. Snakes Brit. Mus., 

 Vol. I, 1893, p. 129 (part); Van Denburgh, Proc. Cal. Acad. 

 Sci., Ser. 2, Vol. V, 1895, p. 137; Van Denburgh, Proc. Am. Philos. 

 Soc, Vol. XXXVII, No. 157, 1898, p. 141; Cope, Report U. S. 

 Nat. Mus., for 1898, 1900, p. 723; Ditmars, Reptile Book, 1907, 

 p. 211; Stejneger & Barbour, Check List N. Amer. Amph. 

 Rept., 1917, p. 73; 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; Werner, Archiv fur Naturgeschichte, 

 Vol. 87, 1 92 1, Abt. A, Heft 7, p. 259 (part); Terron, Mem. y 

 Rev. Soc. Cient. Antonio .Alzate, Vol. 39, 1921, p. 164. 



Charina trivirgata Garman, Mem. Mus. Compr. Zool., Vol. VIII, No. 

 3, 1883, pp. 8, 131; Garman, Bull. Essex Inst., Vol. XVI, No. i, 

 p. 22. 



Description. — Top of head nearly flat, covered with 

 small smooth scaley. Snout long, high, broadly rounded, 

 with prominent, broad high, recurved rostral. Superior la- 

 bials 14 or 15, high anteriorly, but with tips sometimes cut 

 off and appearing as subloreals. Loreals usually two or 

 three. A series of scales encircle eye. Scales on body smooth, 

 in 40 or 41 rows, laterals a little larger. Gastrosteges nar- 

 row, varying in number from 240 to 241, at least. Anal 

 not divided. Urosteges in a single series of about 44. The 

 diameter of the eye is about one-third the distance from the 

 orbit to end snout. 



The color above is yellowish or brownish gray with 



