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the horders of the scales lighter; body whitish laterally and in- 
feriorly. 
Total length: 185 mm; tail 7 mm, diameter 3 mm. 
Hab.: Santa Rosa, Mendoza. 
Only a single specimen was obtained by Mr. Jensen-Haarup 
in 1905 and presented by him to the Zoological Museum. 
The specimen was handed to me in the spring-time of 1923 
by Prof. Ad. S. Jensen, who considered it as new to science and 
asked me to describe it. 
Of this little group of the Fam. Glauconidcie, characterised by 
the absence of supraoculars, only 4 species have till now been 
described (the hab. of the two species are moreover unknown); 
GL borrichiana is the fifth and is easily distinguished from the 
others by the sharp horizontal edge of the snout. It is the first 
of this group assigned to Argentina, and it seems to be very ap- 
proximate to GL unguirostris, Boulenger, which is the only snake 
of the other group (with supraoculars) that is found in Argentina 
(Mendoza) and only in a single specimen too. 
17 — 8 — 1923 . 
