50 G. A. BOULENGER 



Scales in 15 rows. Ventrals 214; anal divided; subcaudals 22. 

 Pale brown above, speckled with black, with a narrow black 

 vertebral line and a broad black lateral band; the two rows of 

 scales below the lateral band white, spotted with black; upper 

 surface of head, chin, and the dorsal region above the vent enti- 

 rely black ; anterior two thirds of ventral shields black, posterior 

 third white. 



Total length 470 niillim. ; tail 32. 



A single female specimen from La Plata, from Dr. C. Spe- 

 gazzini's collection, 1891. 



