60 SYNOPSES AND DESCRIPTIONS. 
Postmaxillary teeth larger, separated by an interspace; 
rostral trihedral, sharp-angled HETERODON. 
Postmaxillary teeth longer, smooth; 
rostral swollen, rounded CEMOPHORA. 
eye large, pupil round XENODON. 
eye small, pupil subelliptical HyYPsIGLENA. 
TACHYMENIS. 
Wiegmann, 1834. 
Moderately stout to slender; belly broad, rounded; head distinct from 
the neck, narrow in front; tail moderate, tapering. Eye moderate, pupil 
round or subcircular. Posterior maxillary teeth longer, grooved; anterior 
equal or slightly longer than those immediately following. Loreal present 
or united with other shields. Crown-shields nine. Internasals somewhat 
narrow in front. Oculars 1—2. Scales smooth, in 17 to 21 rows. Anal 
bifid. 
Labials seven; scales in 19 series; 
longitudinal bands, continued on the head lineata. 
ending at the back of the head — imperialis. 
vermilion, shading through orange to the golden beneath 
lateritia. 
a dark band with white borders on each side of the neck 
proterops. 
Labials eight; scales in 21 (19—21) rows; 
a white band on each side of the anterior part of the trunk 
Jissidens. 
brown, with an indistinct dorsal streak 
bipunctata. 
head and neck brown; behind this a yellowish neck band of about 
four scales in width melanocephala. 
Several of these species ean hardly be regarded as firmly established. 
The descriptions are insufficient for comparison. 
TACHYMENIS LINEATA. 
Tomopon LinzAtus Duméril & Bibron, 1854, Erp. Gén. VII, 936, pl. 78. 
Head distinet from the neck; tail near one fourth of the total. Posterior 
upper maxillary teeth longer, grooved. Crown-shields normal. Rostral 
