36 CINOSTERNID. 
Synopsis of the Species. 
I. Plastron small, the width of the posterior lobe not more than half 
that of the shell; a narrow bridge connects the plastron with 
the carapace; lobes of plastron slightly, if at all, movable. 
Male with a patch of small horny, keeled tubercles on the 
hinder side of the leg and another below the thigh. 
Gular shield well developed, triangular 1. odoratum, p. 37. 
Gular shield vestigial or absent...... 2. carinatum, p. 38. 
II. Plastron of moderate 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 movable; plastron notched posteriorly. 
Male with a patch of small horny, keeled tubercles on the 
hinder side of the leg and another below the thigh. 
A. Front plastral lobe considerably narrower than the opening of 
the shell. 
Pectoral shields triangular, or forming 
a very short median suture ...... 4. pensyluanicum, p. 39. 
Suture between the pectoral shields 
two thirds the length of that between 
the humerals ; gular shield not one 
third the length of the front lobe 
ofsthe: plastront a marries ct > cae 3. hirtipes, p. 38. 
Suture between the pectoral shields 
nearly as long as that between the 
humerals; head and jaws without 
ALY SPOtSe on sphere cate autos tkokys 5. flavescens, p. 40. 
B. Front plastral lobe nearly closing 
up the shelley cq egnaeutete sree 6. henrici, p. 40. 
IIL. Plastron narrower than the opening of the shell, connected 
with the carapace by a very short bridge, the width of which 
nearly equals the length of the front plastral lobe; front and 
hind lobes movable; plastron notched posteriorly. Male 
without patches of horny tubercles on the hind limbs. 
@ananacestnicaninatem ese einen 7. scorproides, p. 41. 
} ; 
IV. Lobes of the plastron movable and completely closing the shell 
in the adult, the pectoral and femoral shields being then in 
contact with the axillary and inguinal; plastron not or but 
very feebly emarginate posteriorly. Male without patches of 
horny tubercles on the hind limbs. 
A, Carapace unicarinate, 
Plastron slightly nicked posteriorly .. 8. integrum, p. 42. 
g I J Y ) 
