504 BT'LLETTN 58, UNITED STATES NATIONAL MUSEUM. 



wdder beliind the iniddle, not emarginate in front; a well-developed 

 vertebral keel and an interrupted keel on each side dividing the costal 

 areoles; sliields with small areoles and wide niargms with numerous 

 deeply cut concentric lines; nuchal rather large, broader behind than 

 in front, longer than broad ; first vertebral somewhat narrower than 

 the others, and like these, with the exception of fifth, angularly 

 emarginate behind; second vertebral slightly longer than broad, 

 longest, the others broader than long, all except fifth narrower than 

 the adjacent costals; sixth to tenth marginals broadest, first slightly 

 narrower; lateral edge slightly turned up; none of the marginals 

 extending beyond the others, the whole outline being entire, not 

 serrate; plastron flat, each sliield with deep cut lines, rounded behind 

 and in front; a ligamentous hinge between pectoral and abdominal 

 shields; plastron fastened to carapace with ligament and as wide as 

 opening of shell; abdonmial seam longest; anal seam slightly longer 

 than pectoral, which equals humeral and gular seams together ; humeral 

 and femoral seams A^ery short, the last one shortest and less than one- 

 fourth the anal seam; axillary present, but inguinal sliield wanting; 

 forearm anteriorly with a few large scales, with free, not pointed, edges ; 

 digits with a slight web at base; base of tail and posterior aspect of 

 femur with numerous blunt tubercles. Color (in alcohol) : Carapace 

 blackish brown, each areole bright chestnut, median keel from middle 

 of second vertebral backward bright buff; plastron uniform blackish 

 bro^v^l, marginals underneath and a narrow outer margin on abdomi- 

 nal and pectoral shields pale buff; top of head dark drab, parietal 

 region exteriorly and posteriorly narrowly edged with black, a narrow 

 black-edged bridge of drab on the median line posteriorly joining with 

 the isabella-color of the neck; sides of head pale reddish gray; a nar- 

 row black line from upper corner of eye widening backward and bor- 

 dering beneath a broad pale band, which surrounds the sides and 

 posterior outHne of the dark parietal region; the pale, dark-edged 

 band is faintly indicated in front of the eye on the canthus rostralis; 

 neck isabella-color, with indications of longitudinal buff, dark-edged 

 stripes; legs dull ochraceous underneath, palms and soles dusky; tail 

 isabella-colored, with a dusky, longitudinal band on each side and a 

 dusky line on the middle line above and below. 



Dimensions. 



mm. 



Greatest length of carapace 124 



Greatest width of carapace 92 



Greatest length of plastron 121 



Width of hind lobe of plastron 69 



Depth of shell 58 



Width of head : 21 



Length of tail from vent 20 



