ENYGRUS BIBRONI. H7 



GENUS ENYGRUS, WAQL. 



GEN. CHAR. The body, in this genus, is deeper than broad, and the 

 tail, of moderate development, is prehensile. Vestiges of posterior 

 limbs may likewise be observed on each side of the anal opening, 

 and much more developed than in We/iona. The upper surface of 

 the head is covered with small polygonal scales instead of plates. 

 The eyes are lateral, that is, placed altogether upon the sides of 

 the head ; the pupil is vertically elliptical. We observe no pits 

 upon the lips. The scales are carinated, rather small, and disposed 

 upon numerous longitudinal series, from thirty-two to thirty-eight 

 in number. The preanal scutella is entire, and the subcaudal 

 scutellae also, that is, disposed upon a single series. 



X. Enygrus, WAOL. Nat. Syst. Amph. 1830, 167. BUM. & BIBR. Erp. gen. VI, 

 1844,476. 



OBSERV. The genus Tropidoboa we have never seen characterized, 

 and therefore are not prepared to discuss its merits as compared to 

 Enygrus. We see it mentioned on Plate I of the " Voyage au Pole 

 Sud et dans 1'Oceanie," but Dumeril has not deemed it advisable to 

 retain it. 



ENYGRUS BIBRONI, Dum. & Bibr. 

 (Plate VIII, figs. 8-11.) 



SPEC. CHAR. Cephalic scales considerably larger anteriorly than pos- 

 teriorly. Dorsal scales disposed upon thirty-eight longitudinal series. 

 Abdominal scutellae two hundred and forty-four; subcaudal scu- 

 tellae sixty-two. Color above brownish or blackish, with irregular, 

 large, black blotches ; beneath yellowish-white, with longitudinal 

 bands of black. 



STN. Enyyrus bibroni, DUM. & BIBR. Erpet. gen. VI, 1844, 483. 

 Tropidoloa bibroni, HOMER. & JACQ. in Dumont D' Urv. Voy. au Pole Sud et dans 

 1'Oceanie. Zool. Kept. 1842, PI. i. 



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