636 - 12. BOIDE 
138. Lichanura trivirgata Cope 
San Lucan Boa 
Lichanura trivirgata Corr, Proc. Acad. Nat. Sci. Phila., 1861, p. 304 
(type locality, Cape St. Lucas, Lower California); Jan, Iconogr. 
Génér. Oph., 2e livr., 1865, pp. 69, 70; Corr, Bull. U.S. Nat. 
Mus., No. 1, 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; Bepinc, West Amer. Scientist, Vol. III, No. 
24, p. 98; Cops, 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; BouLencer, Cat. Snakes Brit. Mus., 
Vol. I, 1893, p. 129 (part); Van Denpurcu, Proc. Cal. Acad. 
Sci., Ser. 2, Vol. V, 1895, p. 137; VAN Densurcu, Proc. Am. Philos. 
Soc., Vol. XX XVII, No. 157, 1898, p. 141; Cope, Report U. S. 
Nat. Mus., for 1898, 1900, p. 723; Dirmars, Reptile Book, 1907, 
p. 211; SreynecerR & Barsour, Check List N. Amer. Amph. 
Rept., 1917, p- 73; VAN DensurcH & Stevin, Proc. Cal. Acad. 
Sci., Ser. 4, Vol. XI, 1921, p. 52; Netson, Mem. Nat. Acad. Sci., Vol. 
XVI, 1921, pp. 114, 115; Werner, Archiv fur Naturgeschichte, 
Vol. 87, 1921, 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. 1, 
pry22s 
Description.—Top of head nearly flat, covered with 
small smooth scales. 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 
