52 THE SNAKES OF BRITISH EAST AFRICA 
more or less distinct traces of the markings on the head ; upper 
lip yellowish, with brown dots ; lower parts, including lower 
third or lower half of outer row of scales yellowish, with a 
brownish line on each side of the belly. 
Specimen found also at Juja, near Nairobi, and at Njoro 
and north of Guaso Nyiro. 
Biseriatus . — Total length 4 feet 7J inches. Tail 1 foot 
3| inches. Greyish or pale brown above, with a darker verte- 
bral band and two series of reddish-brown or black spots ; 
head with dark-brown or reddish-brown black-edged spots, 
and usually a dark cross-band on the occiput ; a dark streak 
on each side of the head, passing through the eye ; lips with 
black or brown spots, belly greyish, speckled with black and 
spotted with white, sometimes with a rusty median stripe. 
Found at Kurawa, Njoro, and north of Guaso Nyiro. 
Genus Thelotornis — 
Kirtlandii . — Total length 8 feet 10 inches. Tail 1 foot 
3| inches. Greyish or pinkish-brown above, uniform or with 
PSAMMOPHIS SIBILANS. 
From Report of Wellcome Lab., Khartum, Vol. III. 
