Annals of the Transvaal Museum. 
45 
75. 
Eight upper labials, upper anterior temporal not longer that the 
lower. Dendraspis angusticeps (Smith) 
Nine upper labials, upper anterior labial twice as long as the 
lower. Dendraspis mamba. Gough 
76. 
Nostril between two nasals 
Nostril ina single nasal. 
Homorelaps . . . 
84 
77 
77. 
Temporals 1 & 2. 
A single temporal. 
Homorelaps lacteus (Z.) 
Homorelaps dorsalis (Smith'). 
78. 
More than 50 subcaudals. 
Naia... 
Less than 45 subcaudals ... 
79 
82 
79. 
Eye separated from the labials by suboculars 
Labials enter the eye 
80 
81 
80. 
Scales in 21 or more rows on the neck. Naia liaie (L.) 
Scales in 17 rows on the neck. Naia anchietre (Bocage). 
81. 
Sixth upper labial largest. 
Third upper labial largest. 
Naia flava (Merr.) 
Naia nigricollis Beinh. 
82. 
No preeocular 
Praeocular present 
73 
83 
83. 
Eye separated from the labials by suboculars ... ... . 
Labials enter the eye 
88 
86 
84. 
Portion of the rostral visible fr 
distance from the frontal. 
Portion of rostral visible from 
from the frontal 
om above f or quite as long as its 
Elapechis sundevalli Smith. 
above not more than ^ its length 
85 
85. 
Portion of rostral visible from above one-third of its distance 
from the frontal : banded. Elapechis guentheri Bocage. 
Portion of the rostral visible from above almost J its distance 
from the frontal : not banded. 
Elapechis decosteri ( Boulenger ). 
86. 
Rostral detached on the sides Aspidelaps ,.. 
Rostral normal. Sepedon hasmachates ( Lacep .) 
87 
87. 
Ventrals 135 or less. 
Ventrals 146 or more. 
Aspidelaps scutatus (Smith). 
Aspidelaps lubricus (Baud'.) 
88. 
Snout not turned up at end. 
Snout turned up at end. 
Causus rhombeatus (Licht.) 
Causus defilippi (Jan). 
89. 
Nostril directed upwards. 
Nostril directed upwards and ( 
Bitis arietans (Merr.') 
mtwards 
90 
90. 
No hornlike scales on the head 
Head with hornlike scales 
91 
93 
91. 
Supraorbital region raised. 
Supraorbital region not raised 
Bitis inornata (Smith). 
92 
92. 
Outer row of scales keeled. 
Outer row of scales smooth. 
Bitis atropos (Z.) 
Bitis peringueyi (Boulenger). 
93. 
A single hornlike scale above each supranasal. 
Bitis gabonica (Bum. <)' Bibr.) 
The hornlike scales situated above the eyes ... 
94 
94. 
Several superaorbital hornlike 
A single supraorbital hornlike 
scales. Bitis cornuta (Baud.) 
scale. Bitis caudalis (Smith). 
95. 
Rostral with horizontal edge 
Rostral rounded. 
Atractaspis bibroni (Smith). 
96 
96. 
Less than 200 ventrals. 
More than 220 ventrals. 
Atractaspis duerdeni Gough. 
Atractaspis rostrata (Guenther). 
