1. CrNOSTERNUM. 41 



Differs from C. pensylvmiicum in liaviiip: the front plaslral loho 

 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. Tlic membrane between the fixed part 

 and the hind lobe of the plastron so wide as to make the joint 

 ap])car double. Carapace brownish yellow, plastron yellow: head 

 and neck dusky, on the top slightly varied with paler, beneath aud 

 on the sides, including the jaws, thickly speckled with yellow. 



Length of shell 11| centim. 



New Mexico and Arizona. 



7. Cinosternum scorpioides. 



Testudo scorpioidt's, Linn. S. N. i. p. 852 (17G0). 



tricarinata, Scltocpff, Test. p. \), pi. ii. (17iJ2). 



retzii, Dautl Hcpf. ii. p. 174 (1S()2). 



Emysretzii, Sc/ucrif/f/. Prudr. p. 43 (1814). 



scorpioidea, >Sc/itri'i(/r/. I. c. 



Terrapene tricarinata, Merrem, Tent. p. 28 (1820). 



Chersino scorpioides, Merr. I. c. ]). 33. 



Kinosteriion longicaudatum, Spix, 7V.s^. p. 17, pi. xii. (1824); Bell, 



Zool. Juiini. ii. p. 304 (1825); Lcconte, Proc. Ac. Philad. 1854, 



p. 181 ; Stranch, Chclon. Stud. p. 142 (1862). 



brovieaudatum, Spix, I. c. p. 18, pi. xiii. ; Bell, I. c. 



sliawianiun, Bi-ll, I. c. p. .",02. 



scorpioides, Grai/, Stjji. Jicj)f. p. 34 (1831); Bell, ^fon. Testud. 



(1833) ; Du7n. c^- Bibr. v. p. 3G3 (1835) ; Lcconte, I. c. ; St ranch, 



I. c. p. 140. 



scorpioides, part., Gray, Cat. Tori. p. 32 (1844), and Sh. Itcpt. 



i. p. 44 (1855). 

 Swanka scorpioides, part., Gray, Suppl. Cat. Sh, B.ept. i. p. G7 



(1870). 

 longicaudata, Gray, I. 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 ; plasi ron 

 yellow or brown ; head brown, with yellowish spots ; jaws yellowish, 

 usually with brown streaks or marblings. 



Length of shell 13 centim. 



Guianas and Northern Urazil. 



a. $ , sttfd. Cavenne. 



b, c. S & yg., stffd. — ^ ? 



d, e-/. 9-h, i. 2 , ligi'-> & ? 



yg., spn-. 

 k, I, m, n, 0. <S Xi shells. r 



