MORPHOLOGY OF VENOMOUS SNAKES 9 
a peculiar tubercular carination and distinguishes this species from a very closely 
allied Scolecophis atrocinctus. Size rather small. It inhabits a rocky, moun- 
tainous region. ‘Three species are known. 
Genus TANTILLA Baird and Girard. 
Tantilla Baird and Girard, Cat. N. Amer. Rep., Pt. I, Serp., 1853, 131. 
Homalocranium Duméril and Bibron, Mém. Acad. Sci., 1853, XXIII, 490. 
Posterior maxillary tooth grooved. Head depressed and continuous with necks 
No loreal. Eyes below medium size. Body subcylindrical, tail short. Scales 
smooth. Subcaudal divided. Most of the species belonging to the genus are small, 
have a pale brown body and a black head, and lead a secretive or burrowing life. 
They inhabit especially the Central American, Mexican, and South American 
districts and the southern portions of the United States. About 16 species com- 
prise this genus. From the hygienic standpoint the Tantilla are non-dangerous 
poisonous snakes. 23 species are described by Boulenger. 
Tantilla coronata Baird and Girard. 
A yellow or white ring at base of head. Yellow ring followed by a broader ring 
of black. South Carolina, Florida, and westward to Mississippi. 
Tantilla eiseni Stejneger. 
Yellow ring followed in rear by black dots. California. 
Tantilla nigriceps Kennicot. 
No yellow ring at base of head. Texas, New Mexico. 
Tantilla gracilis Baird and Girard. 
Coloration like preceding species, but six supralabial plates instead of seven. 
Missouri to Texas. 
Genus MANOLEPIS Cope. 
Manolepis Cope, Proc. Amer. Phil. Soc., 1885, 76.— Boulenger, Cat. Brit. Mus. III, 1896, 120. 
Maxillary teeth equal anteriorly to grooved teeth, which are enlarged; anterior 
mandibular teeth longer than posterior. Head distinct from neck. Pupil vertical. 
Scales smooth, pitless. Anal and subcaudal undivided. There are discrepancies 
in the descriptions of different authors. 
Manolepis putnamii 1 Jan. 
Anterior maxillary and mandibular teeth longer than median. Pupil round, 
Body cylindrical, stout; neck but little constricted; muzzle protruded beyond labial 
margin, oblique, truncate in profile; head acuminate and oval. 
Genus CONOPHIS Peters. 
An elongated, grooved tooth separated from others by an interspace. This 
genus is rather an isolated American variety, and it is quite similar to and probably 
allied to the African genus Rhamphiophis Peters. Both genera have decurved 
muzzle and claw-like rostral plate, designed for scooping a cavity in the soil by a 
downward movement. Three species are recorded, all Mexican. 
Genus CONIOPHANES Hallowell. 
di ng oa Cope, Bull. U. S. Nat. Mus., 1887, 55.— Boulenger, Cat. Brit. Mus., Snakes, III, 
955 . 
Posterior maxillary teeth elongate and grooved. Pupil round. Loreal present. 
Scales smooth and pitless. Anal and subcaudal divided. Typical species are 
brown or red, with black stripes and delicate and handsome tints. Nine species 
described, with one exception confined to Central America and Mexico. 
Coniophanes imperialis Baird. 
Erythrolamprus imperialis Boulenger, Cat. Brit. Mus., Snakes, III, 1896, 206. 
Scales in nineteen rows. Sides dark; a median dorsal band of varying width; 
ventral red. According to the number of labials it is divided into two subspecies. 
1In many respects this may be an Aglyphodont colubrine belonging to Dromicus putnamii Cope. 
