8 SYNOPSES AND DESCRIPTIONS. 
more ante and two or more postorbitals, or the eye surrounded by a ring 
of eight or ten seales. Labials nine or more, anterior commonly higher. 
Infralabials ten or more, anterior broader or subdivided. Two or three 
pairs of small submentals, decreasing in size backward. Scales small, 
smooth, number of rows varying greatly (highest noticed, 45). Ventrals 
varying in width and number (near 200). Anal entire. 
Color uniform leaden to reddish-brown, light yellowish below. 
CHARINA TRIVIRGATA, 
LICHANURA TRIVIRGATA Cope, 1861, Pr. Ac. N. Sc., Phil., 804. 
Rostral prominent, elevated, recurved, five-sided. Loreals five. Ocular 
ring of ten scales. Labials 14-15, anterior higher. Infralabials 15, ante- 
rior five longest. A short mental fissure. Scales in 40 rows, inferior a 
little larger. Total length, 25 inches; tail 4. Brownish-yellow, lighter 
below. Belly and flanks speckled with reddish-brown. Back with three 
deep, reddish-brown bands from muzzle to end of tail, median four, lateral 
five, and separating spaces three and a half scales in width. (rom descr.) 
Hab. Lower Cal. 
Possibly a variety of the preceding. 
BOAEIDAE. 
Body more or less compressed; head distinct; tail generally prehensile. 
Pupil oblong, erect. Larger teeth in front. Submental fold conspicuous. 
A spur or rudimentary limb on each side of the vent. 
Boa Linné. 
Body elongate fusiform, slightly compressed; head distinct, flattened on 
the crown, broad posteriorly, muzzle prominent; tail prehensile. Nasals 
entire or divided. Nostril lateral. Teeth smooth, larger forward. Labials 
not pitted, short, numerous. Scales covering the top of the head and the 
loreal region and surrounding the eye, small. Dorsal scales small, smooth, 
flat. Anal entire. Subcaudals simple. 
Boa IMPERATOR. 
Daudin, 1803, Hist. Rept. V, 150. 
Body robust. Muzzle truncate, outline of extremity nearly vertical. 
Scales of head, face, and temples small, rather larger than those of B. con- 
strictor. Kye surrounded by 16 to 18 scales, of which several are in 
