242 [May, 1S45. 



slender; the body is long and also slender, thickest at the middle; the tail is 

 long and tapering ; the scales upon the tail and body are smooth and quadran- 

 gular. 



Abdominal scuta 190: subcaudal 115. 



Colour. — Head above and upon the sides, as far as the superior margin of 

 the orbit, of a dark brown colour ; the upper part and sides of the body are also 

 brown; the chin, the throat, and under part of the tail, are straw colour. 



Dimensions. 



Feet. Inches. Lines. 



Length of head, ... o 1 



Greatest breadth, - - - 10 



Length of body, 2 6 



Length of tail, ... o 13 



Coluber Pickeringii. 



Description. — Head large, rounded posteriorly, covered above with nine 

 plates ; the rostral plate is large, hexagonal, curved inferiorly ; the anterior 

 frontals are large and pentagonal ; the posterior frontals are hexagonal, larger 

 than the anterior ; there are two nasal plates, with the nostril placed within 

 them ; the vertical plate is large, broad anteriorly, incurvated at the sides, 

 where it receives the internal margin of the superior orbitar plate ; the occipital 

 plates are large, pentagonal, they are joined anteriorly to the vertical, the supra- 

 orbital and the upper post-ocular plate ; there is but one ant-ocular plate ; there 

 is one loral plate, which is quadrangular; there are two post-ocular plates, which 

 are also quadrangular ; the eye is large and projecting ; there are nine superior 

 labial plates, the seventh and eighth the largest; the neck is slender ; the body 

 is long, thickest at the middle ; the tail is long and tapering ; the scales upon 

 the tail and body are quadrangular. 



Colour. — Head, body and tail, are of a sea-green colour ; upper and lower 

 jaw, chin, throat, abdomen, and under part of tail, straw colour. 



Abdominal scuta 16© : subcaudal 128. 



Dimensions. 



Length of head, 

 Greatest breadth, 

 Length of body, 

 Length of tail, 



Coluber villains. 



Description. — Head of moderate size, depressed, covered with nine plates ; 

 the rostral plate is hexagonal, incurvated below ; the anterior frontals are small 

 and quadrangular ; the posterior are larger than the anterior, they are penta- 

 gonal ; the vertical plate is of moderate size, it is hexagonal, and broader an- 

 teriorly ; there is but one nasal plate ; the nostril is placed near its anterior 

 margin ; there is a loral plate, which is quadrangular; there are two post-ocular 



