1. STERNOTH RUS. 195 
a, b. 3 Q, stffd. Natal. 
e. 9, stffd. S. Africa. 
d. Ye., spir. EK. Africa. Sir J. Kirk [C 
e. 9, spir. La Digne Isd., Seychelles. Dr. A, Giinther [P.}. 
3. Sternotherus nigricans. 
Testudo nigricans, Donndorff, Zool. Beitr. iii. p. 34 (1798). 
subnigra, Daud. Rept. ii. p. 197 (1802). 
mys castanea, Schweigg. Prod. p. 45 (1814). 
subnigra, Schweigg. l. c. p. 46. 
Terrapene nigricans, Merr. Tent. p. 28 (1820). 
Kinosternon nigricans, Bell, Zool. Journ. ii. p. 805 (1825). 
Sternotherus leachianus, Bell, /. c. p. 806, pl. xv. (1825). 
castaneus, Gray, Syn. Rept. p. 38 (1881); Dum. § Bibr. ii. 
p. 401 (1835). 
subniger, Gray, l.c.. and Cat. Tort. p. 37 (1844), and Sh. 
Rept. i. p. 51 (1855), and Suppl. p. 79 (1870), 
nigricans, Dum. § Bibr. p. 899; Biancont, Spec. Zool. Mosamb. 
p. 58, pl. vil. (1851); Strauch, Chelon. Stud. p. 148 (1862) ; Peters, 
Reise n. Mossamb. iii. p. 8 (1882). 
Carapace obtusely keeled in the young, posterior margin entire ; 
second and third vertebral shields a little broader than long in the 
adult. Intergular shield large, not twice as long as broad; suture 
between the abdominal shields longer than that between the 
femorals ; the length of the outer border of the pectoral shield 
equals that of the humeral, and exceeds the length of the inner 
border of the latter shield. Head large ; snout very short; upper 
jaw neither hooked nor bicuspid; the length of the longitudinal 
suture between the frontal shields nearly equals the width of the 
interorbital space. Dark brown above, yellow, or yellow and brown, 
inferiorly ; upper surface of head without spots or vermiculation. 
Length of shell 15 centim. 
Madagascar ; Mozambique. 
a-c. Q, spir. Madagascar. Dr, A. Giinther [ P.]. 
d. Q, stffd. Madagascar, 
e. 9, skel. Madagascar. 
f. Q, stfid. ? 
Gp Hor., spir. e 
4. Sternotherus derbianus. 
Sternotherus derbianus, Gray, Cat. Tort. p. 37 (1844), and Sh. Rept. 
i. p. 52, pl. xxi. (1855); Strauch, Verth. Schildkr, p. 109 (1865) ; 
Bocage, Jorn. Sc. Lish. 1. p. 57 (1866); Gray, Suppl. Cat. Sh. Rept. 
i, p. 79 (1870); Beettg. Abh. Senck. Ges, xii. p. 409 (1881), and 
Ber. Senck. Ges. 1888, p. 16. 
Carapace keeled in the young, the keel disappearing in the adult, 
the shields of which are smooth; second and third vertebral shields 
a little longer than broad in the adult. Intergular shield not more 
than twice as long as broad ; suture between the abdominal shields 
P 
