28 SYNOPSES AND DESCRIPTIONS. 
tals two (2—3). Temporals 1+2. Labials seven (7—8). Eye over third 
11), fifth and sixth 
larger, posterior very small. Submentals two pairs, hinder larger. Scales 
and fourth, fifth and sixth larger. Infralabials 10 (9 
keeled, truncate or notched at the end, in 19 rows (19—21 var. validus), 
dorsal narrow, outer broad, faintly keeled. Ventrals 140—150. Anal 
bifid. Subcaudals 64—86 pairs. 
Reddish-brown, more or less olive, with a band of light color from the 
rostral along the upper labials the first and second rows of scales on the 
flank; below this on the first row and ends of the ventrals there is a nar- 
row brown space. The light bands are usually margined with a dark line. 
Anteriorly the belly is yellowish, more or less mottled with olive, or bear- 
ing two lines of olive near the middle; posteriorly the ventrals are olive, 
with or without a narrow space of yellow in the middle. Chin, throat, and 
labials light yellow. With or without vertebral and lateral narrow lines 
of brown. In Kentucky specimens these lines are almost obsolete. Bright 
fresh ones just taken from the water have the appearance of being striped 
longitudinally, above and below, with narrow bands, the dark separated by 
lighter of about the same width, which do not form very marked contrasts, 
if we except the light stripe on the flank. South Carolina to California 
and Mexico. 
rigidus. Dorsal vittae distinct; colors dark. Southeastern United States. 
grahami. Vittae distinct; bands of yellow on the flank; a light band on 
the middle of the back; belly yellow. Texas. 
validus. Vittae obsolete; light brownish ash above; belly uniform yel- 
lowish. California to Mexico. 
TROPIDONOTUS KIRTLANDI, pl. L, fig. 3. 
REGINA KIRTLANDIL Kennicott, 1856, Pr. Ac. N. Sc., Phil., 95. 
Small. Moderately stout, tapering little to head and tail, belly broad, 
back slightly compressed; head small, sub-oval, little larger than the 
neck, depressed, crown convex, snout short, rounded; tail short, about one 
fifth of the total, tapering regularly to the tip. Eye medium, pupil round. 
Mouth-cleft deep, curved. Head-shields nine. Parietals and frontal large. 
Prefrontals broad, reaching down the side of the face. Rostral broad, 
low. Nasal divided. A loreal. One anteorbital. Postorbitals two. Tem- 
porals 14+2. Labials 6, eye over third and fourth, fifth and sixth larger. 
Infralabials 7 (7—8), fifth and sixth larger. Submentals two pairs, sub- 
equal. Scales keeled, in 19 rows, dorsal narrow, truncate, outer and caudal 
