312 Mr. G. A. Boulenger on the Genus Pseudoxyrhopus. 
the Coronellines and next to Lcimprophis , which is regarded 
by Gunther as related to the Lycodonts, a view which I share ; 
Gunther, on the contrary, was inclined to place it u with the 
larger and more-developed Colubers.” But the remarkable 
dentition of the lower jaw does not appear to have been 
noticed by either author, an omission which accounts also 
for the fact that other species of the same genus have been 
described under the generic names of Xenodon (Peters), 
Liophis (Gunther), and Coronella (Boulenger). This man- 
dibular dentition points to affinity with the Lycodonts, near 
which I would place Pseudoxyrhopus in the system, with the 
following definition : — 
Maxillary teeth 16 to 18, the two posterior strongly 
enlarged and separated from the preceding by an interspace ; 
anterior mandibular teeth much larger than the posterior and 
increasing in size to the fifth, sixth, Qr eighth. Head 
scarcely distinct from neck; eye small, with round pupil. 
Body cylindrical ; scales smooth, without pits, in 17 to 25 
rows. Tail rather short ; subcaudals all or part in two rows. 
Figure showing the dentition of : — A. P. microps ; B. P. quinque - 
lineatus ; C. P. imerince . 
Five species are known, which differ in the following 
characters 
A. Scales in 25 rows; frontal as broad as 
long; rostral just -visible from above; 
two labials entering the eye; ventrals 
207-225; subcaudals 45 P. micrcps , Gthr. 
