3. AMPHISBENA. 447 
19. Amphisbena quadrifrons. 
Cynisca quadrifrons, Gray, Cat. Sh. Rept. ii. p. 36. 
Amphisbena quadrifrons, Peters, Mon. Berl. Ac. 1862, p. 25, and 
ae p. 277, pl. —. fig. 4; Strauch, Mél. Biol. Ac. St. Petersb. xi, 
p. 412. 
Snout rounded, prominent. Rostral triangular, its point visible 
from above; nasals forming a suture, four elongate prefrontals, on 
a curved transverse line; a pair of frontals followed by a pair of 
small occipitals ; eye distinct through the ocular, which forms a 
suture with the second and third labials; two large temporals ; 
four upper labials, third largest; mental trapezoid, followed by a 
larger seven-sided chin-shield; four lower labials, second largest, 
fourth very small; a large chin-shield behind the second lower 
labial. Two hundred and twenty-six to two hundred and thirty- 
seven annuli on the body, forty-eight on the tail. Four anal seg- 
ments. Four preanal pores. 
Hereroland, §.W. Africa. 
20. Amphisbena kraussi. 
Amphisbeena kraussi, Peters, Sttzb. Ges. Nat. Fr. 1878, p. 192, and 
Mon. Berl, Ac. 1878, p, 731, pl.—. fig. 5. 
Allied to A. lewcura. Rostral higher than broad, pointed above ; 
nasals half as long as prefrontals; a very small median frontal; a 
paix of frontals, forming a point posteriorly, wedged in between two 
large postfrontals, which are followed by a pair of occipitals; a 
preocular, separating the ocular from the nasal ; three upper labials, 
third largest, followed by a very large temporal, which is the largest 
of all the head-shields; an elongate mental and two lower labials, 
the anterior of which is very large, the second very small, Six 
anal segments; eight preeanal pores. 
West Africa. 
21. Amphisbena leucura. 
- Cynisca leucura, Gray, Cat. Tort. p. 71, 
and Sh. Rept. ii. p. 36. 
Amphisbzena leucura, Dum. § Bibr. v. p. 498; Peters, Mon. Berl. 
Ae. 1879, p. 277, pl. —. fig. 5; Strauch, Mél. Biol. Ac. St. Petersb. 
xi. p. 388. 
Pramaxillary teeth 5, maxillaries 4-4, mandibulars 7-7. Snout 
rounded, prominent. Rostral small, triangular; nasal and pre- 
frontal on each side united, forming a long suture on the upper 
surface of the snout; a median pentagonal frontal, between the 
supraoculars ; a pair of postfrontals followed by a pair of occipitals; 
three large temporals; ocular a little larger than supraocular; eye 
slightly distinct; a preocular, broader than deep; three upper 
labials, third largest; mental elongate, narrow, trapezoid; two 
lower labials, first extremely large, second small; asmall chin-shield 
on each side, forming a suture with the two lower labials. Two 
