12 



dark line through eye ; no spots on parietal plates. Belly white 

 tessellated with black, the black often covering entire gastro- 

 steges. Throat, lips and inferior side of tail unspotted. 



Five specimens, Nos. 29 and 42. 



This species is evidently near to the L. fraseri, which in- 

 habits Ecuador. The differences may be seen in the following 

 characters, which I derive from Boulenger : The oculars are 1-2 ; 

 five labials are in contact with the anterior genial, which is 

 shorter than the postgenial. Frontal nearly twice as long as 

 broad. No nuchal or lateral spots. "Lower parts white with 

 scattered small black spots." There is some variation in some 

 <of the specimens. In the smallest two there is but one preocular 

 •on each side, and on one side of each there are five labials in 

 ■contact with the pregenials. As compared with L. tceniurus, 

 which belongs to the same group, the oculars are 1-2; there are 

 <only 53-7 urosteges; there is a black nuchal collar, and the tail 

 Is black below. 



LlOPHIS ALBIVBNTEIS Jan. 



Tail five and a half times in total length. Head distinct. 

 Muzzle not projecting; the rostral plate twice as wide as high 

 and visible from above. Internasal plates wider than long, a 

 little shorter than prefrontals. Frontal nearly as wide as long, 

 a little exceeding muzzle' and a little shorter than parietals. 

 Loral deeper than long. Oculars 1-2, temporals 1-2. Superior 

 labials eight, fourth and fifth entering orbit. Five inferior 

 labials in contact with pregenials, which equal the postgenials. 

 Scales in seventeen rows. Gastrosteges 133; anal 1-1; urosteges 

 56. Total length 184 mm.; tail 34 mm. 



Head olivaceous above, followed by a wide black half collar 

 which extends for four scales posterior to the occipital, and to 

 below the line of the canthus oris on each side. Ground color 

 above anteriorly, light brown, which is crossed by two or three 

 transverse black bars. These break up into spots which form 

 six rows, of which the four median are brown and more or less 

 connected, enclosing lighter brown interspaces. The external 

 lateral spots are more distinct, are black and are continued to 

 the base of the tail at intervals of three and four scales. On the 



