O REPTILES. 



convex, seven-sided ; front side in contact with the hinder pro- 

 cess of rostral shield, two sides with each frontal, two with each 

 superciliary, two with the occipitals. Occipitals rounded behind, 

 rather small, bent on the sides. One anterior, two posterior 

 oculars ; loreal none ; one small nasal ; nostrd between the nasal 

 and a process of the first labial, raised upwards between rostral 

 and nasal ; seven upper labials, the third and fourth forming the 

 lower edge of orbit ; one elongate anterior temporal shield, two 

 or three smaller ones behind ; chin-shields regular. Scales 

 smooth, nearly square, in seventeen rows; 151 ventral, one bifid 

 anal, and oj bifid subcaudal plates. Above reddish white, with 

 5H black narrow cross bars, two on the neck larger than the 

 remainder; crown of head with symmetrical black markings; 

 sides black-spotted ; belly uniform whitish. In the oviduct of 

 the second specimen I found four mature eggs, but without 

 embryo; they were 1" long and J" broad. Length of cleft of 

 mouth §■"; length of tail 2|"; total length 15-*". 



4. Rhinostoma, Fitzinger. 



Body rounded, moderate ; tail short ; head short, not very 

 broad, and not distinct from body ; neck not distensible ; rostral 

 shield pyramidal, prominent, sharp above, recurved; scales 

 smooth, large, in fifteen to nineteen rows, rhombic; anal entire; 

 subcaudals two-rowed ; two pairs of frontals ; one anterior, two 

 posterior oculars. Posterior maxillary teeth longest. America ; 

 Africa. 



Rhinostoma, Fitzinger, Neue Classif. Rept. p. 56 ; Wagl. Nat. 

 Syst. der Amph p. 1J1 ; Dum. fy Bibr. vii. p. 992. Heterodon, 

 sp., Schlegel. 



1. Rhinostoma schlegelii. 



Heterodon rhinostoma, Schleg. Ess. ii. p. 100. pi. '3. f. 1J-19. 



Scales in fifteen rows ; anterior frontals in direct contact one 

 with the other ; one pair of posterior frontals. Whitish (in 

 spirits), with broad black rings ; belly black-spotted. Posterior 

 maxillary teeth ? 



North America. 



2. Rhinostoma nasuum. 



Vipera aasua, Oppel,Mus. Paris. Rhinostoma nasuum, Wagl. 

 Nat. Syst. der Amph. p. 171 ; Dum. <3* Bibr. vii. p. [)'.)\. Hete- 



