South African Agamas allied to Agama Mspida. and A. atra. 
As mentioned on the opposite page, we have arranged the species and 
varieties, as we now understand them, into three main groups which seem 
to express their natural affinities. 
The three groups to which we allude are based on the direction of the 
dorso-lateral scales, inwards m I and II, outwards in III ; and on the 
condition of the toes, as shown by the following figures : 
Group I. Groups II and III. 
In G-roup I the terminal dorsal scale of the third or fourth toe is not, or 
at most little, longer than the penultimate, and the ventral series, on the 
same toe, varying from 12 to 20 in number, rarely show black or dark- 
brown pigment at the end of the spinose keels. In Groups II and III the 
terminal dorsal scale is larger and the keels on the subdigital scales, 13 to 
22 in number, are usually tipped with dark brown or black. 
[To face p. 235. 
