u 
Annals of the Transvaal Museum. 
55. Nostril between two nasals and the internasal. 
Trimerorhi mis ... ... ... ... 56 
Nostril not bordered, by the interna, sal ... ... ... 57 
56. Eye as long as its distance from the nostril'. 
Trimerorhinus rhombeatns (Z). 
Eye shorter than its distance from the nostril. 
Trimerorhinus tritaeniatus ( Guenther ). 
57. Subcaudals up to 40. Rhamphiophis miltimaculatus (Smith'). 
More than 50 subcaudals. 
Psammophis ... ... ... ... ... 59 
58. Prasocular extensively in contact with the frontal. 
Psammophis jallae Peracca. 
Prasocular not in contact with the frontal. 
Psammophis crucifer ( Daud .) 
59. Temporals 1 & 1, or 2 & 1 ... ... ... ... 60 
Temporals 1 & 2, 2 & 2y 2 k 3, or 3 & 3 ... .. ... 61 
60. One prteocular. Psammophis thomasi Gough. 
Two, prasoculars. Psammophis trigrammus Guenther. 
61. Two prasoculars .. . ... ... ... ... ... 62 
One prasocular ... ... .... ... ... ... 64 
62. Upper prasocular widely separated from the frontal. 
Psammophis transvaaliensis Gough . 
Upper prasocular in contact with or narrowly separated from 
the frontal ... ... ... ... ... ... 63 
63. Rostral broader than deep (always 2 prasoculars). 
Psammophis notostictus Peter s. 
Rostral as deep as broad (sometimes a single prasocular). 
Psammophis sibilans (L). 
64. Prasocular extensively in contact with the frontal ... ... 65 
Prasocular just in contact or separated from the frontal ... 66 
65. Snout once and a half as long as eye, loreal once and two 
thirds as long as deep, rostral as deep as broad. 
Psammophis furcaius Boettger. 
Snout one and two thirds as long as eye, loreal twice as long as 
deep] rostral a little broader than deep. 
Psammophis leightoni Boulenger. 
66. Frontal as broad as, or but very little narrower than the 
supraocular. Psammophis brevirostris Peters. 
Frontal obviously narrower than the supraocular ... ... 63 
67. Pupil vertical, Parietals broken up into- small shields. 
Pythonodipsas carinata Guenther. 
Pupil round, Parietals normal ... ... ... ... 68 
68. Scales in 15 rows. Aparallactus capensis Smith. 
Scales in more than 15 rows ... ... ... ... 69 
69. No prasocular. Macrelaps microlepidotus Guenther. 
A prasocular ... ... ... ... ... ... 95 
70. Anal entire ... ... ... ... ... ... 71 
Anal divided ... ... ... ... ... ... 73 
71. Nostril between two or three nasals and the internasal ... 78 
Nostril in a single or' semi-divided nasal, or between 2 nasals ... 72 
72. Scales smooth ... ... ... ... ... ... 73 
Scales very strongly keeled. Dasypeltis scabra (L). 
73. No prfbocular. Calamelaps concolor Smith. 
Prasocular present ... ... ... ... ... 74 
Scales in 15 rows ... ... ... ... ... 76 
Scales from 19 to 25 rows. 
Dendraspis ... ... ... ... ... 75 
74 . 
