THE SNAKES OF BRITISH EAST AFRICA 58 
more or less distinct darker and lighter spots and cross-bands ; 
head green above, with or without some patches of pinkish 
speckled with black and a pinkish-black dotted streak on each 
side of the head, passing through the eye. Sometimes head 
uniform green above and on the sides, and black blotches usually 
forming cross-bands on the neck. Upper lip cream colour, or 
pink, uniform or spotted with black ; one or several black 
blotches on each side of the neck ; greyish or pinkish beneath, 
speckled or striated with brown. 
Genus Ajparallactus. 
Jacksonii. — Total length 5 feet 10 J inches. Tail Ilf 
inches. Pale reddish-brown above, with a black vertebral line ; 
upper surface of head and nape black, the nuchal blotch edged 
Aparallactus werneri. 
with yellow and extending to the sides of the neck. A pair of 
yellow spots behind the parietal shields ; sides of head yellow, 
the shields bordering the eye black ; lower parts uniform 
yellowish. One specimen only found at foot of Kilimanjaro. 
Concolor . — Total length 1 foot 6| inches. Tail 4f inches. 
Uniform dark brown or black, somewhat lighter underneath. 
Found in the Boran country. 
Series C. — Proterogly r pha. (Poisonous.) 
Sub-Family VIII. — Elayinae. 
Genus Naia — 
Nigricollis. — Total length 6 feet 6 inches. Tail Ilf inches. 
Coloration very variable. Specimen from Lake Rudolf. 
Uniform brown above, yellowish beneath ; lower surface of 
neck brown in the adult ; young with a broad black ring round 
the neck. 
