1. CINOSTERNUM. 41 
Differs from C. pensylvanicum in having the front plastral lobe 
wider, nearly closing up the shell; the bridge is also rather wider. 
Gular shield half as long as the front lobe of the plastron ; pectorals 
forming a short suture. The membrane between the fixed part 
and the hind lobe of the plastron so wide as to make the joint 
appear double. Carapace brownish yellow, plastron yellow; head 
and neck dusky, on the top slightly varied with paler, beneath and 
on the sides, including the jaws, thickly speckled with yellow. 
Length of shell 113 centim. 
New Mexico and Arizona. 
7. Cinosternum scorpioides. 
Testudo scorpioides, Linn. S. N.i. p. 852 (1766). 
tricarinata, Schoepff, Test. p. 9, pl. ii. (1792). 
retzii, Daud. Rept. ii. p. 174 (1802). 
Emys retzii, Schweigg. Prodr. p. 43 (1814). 
scorploidea, Schweigg. t. ¢. 
Terrapene tricarinata, Merrem, Tent. p. 28 (1820). 
Chersine scorpioides, Merr. 1. ¢. p. 33. 
Kinosternon longicaudatum, Spe, Test. p. 17, pl. xii. (1824); Bell, 
Zool. Journ. ii. p. 304 (1825); Leconte, Proc. Ac. Philad. 1854, 
p. 181; Strauch, Chelon. Stud. p. 142 (1862). 
— brevicaudatum, Sper, 7. c. p. 18, pl. xi.; Bell, 1. e. 
shawianum, Bell, 1. c. p. 302. 
scorpioides, Gray, Syn. Rept. p. 34 (1831); Bell, Mon. Testud. 
(1833); Dum. § Bibr. v. p. 863 (1835) ; Leconte, l. c.; Strauch, 
i. ec. p. 140. 
scorpioides, part., Gray, Cat. Tort. p. 82 (1844), and Sh. Rept. 
i, p. 44 (1855). 
Swanka scorpioides, part., Gray, Suppl. Cat. Sh. Rept. i. p. 67 
(1870). 
longicaudata, Gray, 1. c. p. 69. 
Head moderate; jaws strong, beak hooked. Digits moderately 
webbed. Carapace tricarinate, shields more or less distinctly 
imbricate. Plastron large but not closing entirely the shell ; bridge 
broad and very short; lobes well movable: front lobe as long as 
the immovable portion ; hind lobe notched posteriorly ; gular shield 
usually about half the length of the front plastral lobe; suture 
between the pectoral shields much shorter than that between the 
humerals; axillary and inguinal shields largely in contact. Tail 
ending in a nail-like horny tubercle. Carapace brown; plastron 
yellow or brown ; head brown, with yellowish spots ; jaws yellowish, 
usually with brown streaks or marblings. 
Length of shell 13 centim. 
Guianas and Northern Brazil. 
a. 9, sttfd. Cayenne. 
be 3 & yg., stfid. iy 
d, e-f, g-h,v. 2, hgr., & —P 
yg-, splr. 
k, L, m, n,o. & Q, shells. —-? 
