700 13. COLVBRIDSE 



middle portion of Lower California. Mr. Slevin secured 

 one at the spring of San Bartolo in the Cape Region. 



Habits. Mocquard states: "Ce serpent vit dans les 

 buissons, sur lesquels il se tient ordinairement perche et se 

 meut avec une grande agilite." 



Our specimen was found on the sand in the arroyo at 

 San Bartolo. 



156. Elaphe chlorosoma (Giinther) 

 Mexican Green Snake 



Coluber Morosoma GONTHER, Biologia Centrali-Americana, Kept., 1894, 



p. 115, pi. 41 (type locality, Atoyak and Amula in Guerrero 



and San Ramon in Jalisco, Mexico). 

 ELa-fhe Morosoma STONE, Proc. Acad. Nat. Sci. Phila., 1811, p. 231; 



STEJNECER & BARBOUR, Check List N. Amer. Amph. Rept, 1917, 



p. 82. 



Description. Head long, distinct from neck, with some- 

 what flattened top, and elongate snout. Body, rather 

 slender, a little compressed laterally. Tail tapering, rather 

 short. Rostral large, much broader than high, recurved 

 but little above, 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, a frontal 

 usually in contact with preocular and much broader anteriorly 

 than behind, a pair of supraoculars very narrow anteriorly, 

 and a pair of large parietals. Anterior and posterior nasals 

 distinct. True loreal single, elongate, without subloreal. 

 Preoculars one. Postoculars two. Temporals small and 

 numerous, about three in the first row. Supralabials eight 

 or nine, seventh largest, fifth and sixth or fourth and fifth, 

 reaching eye. Inferior labials eleven, fifth and sixth largest, 

 first pair meeting on median line. Genials in two pairs, the 

 posterior longer but very narrow. Scales on body rather small, 

 short, smooth, with two apical pits; in 33 rows, those of the 



