5 0. CLEMMYS 



d. — Inguinal plates not wedged in between abdominals 

 and marginals; no definite longitudinal light bands 

 on head, neck, limbs, or tail; no definite dark 

 blotches on marginals. 



Clemmys. — p. 973. 

 d'. — Inguinal plates more or less wedged in between 

 abdominals and marginals; definite longitudinal 

 light bands on head, neck, limbs and tail; definite 

 dark blotches on upper and lower surfaces of mar- 

 ginals. 



Pseudemys. — p. 978. 

 c'. — Suture between abdominal plates about twice length 

 of suture between pectorals; inguinal plates wedged 

 in between abdominals and marginals. 



Chrysemys. — p. 980. 

 b'. — Feet club-shaped, not webbed; one supracaudal plate; 

 skin on top of head divided into scales. 



Gopherus.- — p. 986. 

 a'. — Plastron hinged, closing against carapace when head and 

 limbs are redrawn. 



Terrapene.— p. 984. 



Genus 50. Clemmys 



Clemmys Ritgen, Nova Acta Acad. Leopold — Carol., Vol. 14, Pt. i, 



1828, p. 272 (type, punctata^ guttata). 

 Chelopus Rafi.vesque, Atlantic Journal, l8j2, p. 64. 

 Actinemys Ag.assiz, Contr. Nat. Hist. U. S., Vol. I, 1857, p. 444 (type 



marmorata). 



The shell is broad and low. The plastron is immovably 

 united to the carapace by a broad bridge. There is no median 

 ridge on the alveolar surface of the upper jaw parallel to 

 the cutting edge. The internal openings of the nostrils are 

 between the eyes. The fingers and toes are webbed. The 

 skin on top of the head is not divided into scales. There are 

 two supracaudal plates. The tail is moderate or long. 



