1. CINOSTERXTJM. 30 



Very closely allied to O.pensylvnnicum. Size larger. The suturo 

 between the pectoral shields two tliinls the lonu'th of that bef wecii 

 the humorals, aud nearly e(iualliiig the length of the giilar. The 

 plastron is even rather smaller than in C. pensylvanicum, and tho 

 front lobe is not broader than the hind one. C. Jiirtipfs may bo 

 regarded as intermediate between C. odoraium and 0. pensylvanicum, 

 as observed by Leconte. 



Length of shell 12 centim. 



Mexico. 



4. Cinosternum pensylvaniciim. 



Testudo pensylvanica, Gynel. S. X. i. p. 1042 (178S) ; Schoepff, Test. 



p. 107, pi. xxiv. tig. A (1792) ; Dmd. Sept. ii. p. 182, pi. xxiv. 



tigs. 1,2 (lsOi>). 

 Emys pensylvanica, Schweigg. Prodr. p. 44 (1814). 

 Terrapeue peusylvauica, Merr. Tent. p. 27 (1820). 

 Cistuda pensylvanica, <Srty, Juurn. Ac. I'hilad. iv. p. 210 (]S2o). 

 Kinosteruon pensvlvauicum, Bell, Zool. Journ. ii. p. 304 (1825) ; 



Bum. ^- Bibr. \\. p. 307 (l8.'5.5) ; llolbr. N. Am. llerp. i. p. 127 



pi. xxi. (1842); Graij, Cat. Tort. p. 33 (1844); Lccunte, Froc. 



Ac. '"■■ ' ■ -■ ^'^^ " ,. . ^, ^ . - .- . 



Schil 



3. Phihid. ISrA, p. 183; Graif, Cat. Sh. Eept. i. p. 45, pi. xx. c. 

 •. 1, 2 (1855) ; Strauch, Chelan. Stud. p. 144 (1802), and Verth. 

 hildJa: p. 08 (1865); Bocuurt, Journ. de Zool. ii. p. 392 (1870). 



oblougura, Gray, Cat. Tort. p. 33. 



doublfdayi, Gray, I. c, and Cat. Sh. Ilept. i. p. 45, pi. xx. 



punctatinn. Gray, Cat. Sh, Bept. i. p. 45, pi. xx. c. figs. 5, 6, 



and Suppl. p. 07 (1870). 



liippocrepis, Gray, Cat. Sh. Bept. i. p. 40, pi. xx. c. figs. 3, 4, 



ajid Sujjpl. p. 07. 

 Thyrcsternum pensylvanicum, Agass. Confr. X. II. U. S. i. p. 428, 



pi. iv. tigs. 7-12, "& pi. V. tigs. 10, 17 (1857). 

 Swanka fasciata. Gray, Suppl. Cat. Sh. Bept. i. p. 68. 



Head moderate ; jaws strong ; beak feebly hooked. Limbs 

 moderately webbed. Carapace with three faint keels in the young, 

 keelless or with a single faint keel in the adult. Plastron of mode- 

 rate size, smaller than the opening of the shell, connected with the 

 carapace by a bridge, the width of which is considerably less than 

 the length of the front plastral lobe ; front and hind lobes well 

 movable in the adult ; front lobe longer than the fixed portion, 

 much narrower than the opening of the shell ; hind lobe notched 

 posteriorly ; gular shield not half the length of the front plastral 

 lobe ; pectorals triangular, inner angles meeting on the median line, 

 or forming a very short suture ; axillary aud inguinal shields 

 largely in contact. Male with a patch of small, horny, keeled 

 tubercles on the hinder side of the leg, and another below the thigh. 

 Tail ending in a nail-like horny tubercle. Carapace brown or 

 brownish ; plastron yellow or brown ; all the sutures between the 

 shields of the shell dark brown or blackish. Head and neck brown 

 above, with yellowish spots, often with two more or less distinct 

 yellowish streaks on each side, proceeding from the orbit ; jaws 

 yellowish with brown dots or lines. 



Length of shell 11 centim. 



Eastern iSI^orth America, from New York to the Gulf of Mexico. 



