122 THE SNAKES OF SOUTH AFRICA. 
GENusS PSAMMOPHIS. 
Ten Species in South Africa. 
KEY OL DLE SPECIES: 
Scales in 17 rows ; ventrals 154-198. Anal 
entire; two preoculars; sub-caudals 
81-104 .. - Bie afc .. Psammophis notostictus 
They 
Ss. 
s have slender cylindrical bodies, tapering tails and narrow head 
Fic. 52.—The Cross-marked Snake (Psammophis crucifer). 
are back-fanged snakes and poisonous, but not to any great extent. 
The snakes of the Psammophis genu 
Scalesin 17 rows; Ventrals154-198. Anal 
divided (rarely entire). Preocular ex- 
tensively in contact with the frontal ; 
forehead concave; two labials enter- 
ing the eye a xs a: .. Psammophis furcatus. 
