120 PROCEEDINGS OF THE ACADEMY OF 



furnish another species from Belize, whicli I have heretofore identified with 



the same. 



The species may be thus distinguished. 



One gular scute, no intergular ; five inner marginals, the posterior 

 triangular, not in contact vrith the femoral or abdomi- 

 nal. Abdominal narrower than pectoral or femoral. 

 Sternum little emarginate behind. Vertebral scuta broader 

 than long, the median except behind covering a keeled 

 ridge abnormi3. 



One gular, and an intergular behind it; four or five inner margin- 

 als, the posterior in contact with femoral and abdominal ; when 

 only four, the median elongate ; vertebral scuta much longer 

 than broad ; no dorsal keel. Abdominal scuta equal or wider 

 than those adjoining berabdii. 



Two gulars, no intergular ; four inner marginals, the median shorter 

 than the hinder, joined as in the last ; abdominal as in the last ; 

 vertebrals much longer than wide, no dorsal keel. Sternum 

 well emarginate behind mavei. 



Dermatemys ABNORMis Copc, sp. nov. 



The greatest breadth of the vertebral plates exceeds the length of the cos- 

 tals ; the length of the same equals the width of the anterior costals, exceeding 

 the width of the posterior. The form of the head is elongate, and acuminate ; 

 there is a strong basal angle all round the mandible below the cutting edge. 

 Though the carapace measures seven inches in length, the costal bones 

 are only united for half their length, and the hyo- and hyposternal 

 bones are entirely separated from the marginals. This lateral fontanelle 

 is eight lines wide medially. The plastron is well developed, except a very 

 small fontanelle at the middle of the hyo-hyposternal suture. This, with the 

 wider vertebral shields, indicate a young animal, and though there are no signs 

 of immaturity about the head, it doubtless is such. Nevertheless, I cannot 

 suppose the vertebral scutes become as narrow, nor the carapace as fully ossi- 

 fied at maturity, as in the other species, and its distinctness is confirmed by 

 other characters as given. 



Above light brown, below and inner fixces of limbs light yellow. 



Length of plastron 5 in. 9 lin. ; width of same at axillie 3 in. ; at posterior 

 end 11-5 lin. ; total width at groin 5 in. 5 lin. ; length head from behind ear 

 17 1. ; greatest width head 1 in. 



From Belize River, Yucatan. Museum Smithsonian, No. 6545 ; from Dr. 

 Parsons. 



LACERTIL[A. 



PROCTOTRETUS Dum. Bibr. 



Proctoteetus prasinus f'ope, sp. nov., of the group Rhytidodira Gird. 



Head broad, short, vertex and front plane longitudinally and transversely. 

 Canthus rostralis strong, loreal region concave. Nostril just below the edge 

 of the canthus. Scales of head above smooth, angulated. A transverse scale be- 

 hind rostral ; a united pair of supranasals, the larger divided internasals between 

 the smaller longitudinal posterior supranasals. Three pairs frontonasals, the 

 two anterior in contact with canthal row, and sei)arated by four scales ; the 

 posterior largest, and in contact. No superciliary series, except from the 

 frontal backwards; frontal little longer than broad. Occipital (^interparie- 

 tal) small, in contact with superciliary rows, and followed by two plates a 

 little larger. Occipital and temporal regions covered with rather large, smooth 

 scales, those of the latter smaller, and rounded behind. Supraorbitals of ir- 

 regular size, smooth, the three inner larger, little broader than long ; together 

 three rows scarcely separated within hy a series of small scales. Two marginal 



[March, 



