AGAMA HAETMANNI. 121 
70 to 88, but the difference between the lowest of these numbers and the 67 present in 
A. hartmanni is so slight as to be of no importance. In all the types of A. dorice there 
are a few pointed scales at the anterior and upper borders of the ear, forming almost a 
short fringe in some, while in others they are reduced to two or three scales. In 
the enlarged figure of the head of A. hartmanni similar scales are present in that 
position. 
From the foregoing facts I think it is evident that it is impossible to regard A. dorirn 
as distinct from A. hartmanni. 
A. bibronii has its nostril in the same position as in A. hartmanni ; it possesses a 
slight nuchal crest ; the scales on the upper surface of the head are smooth or feebly 
keeled; it has 11 to 14 upper labials, 40 rows of scales along the back between the 
origin of the limbs, and 62 to 64 scales round the middle of the body. The third and 
fourth toes are equal and as long as the snout, measured, as in A. doriw, from the pos- 
terior border of the eye. The only points apparently in which A. bibronii differs from 
A. hartmanni are the slightly larger rosettes of scales on the sides of the head and 
neck and the larger body-scales, which are scarcely smaller than the caudals, while in 
A. hartmanni they are decidedly smaller. 
In the largest of the types of A. doriw the scales on the nape pass gradually into 
those on the hinder part of the neck, but in the females the scales in that region are a 
little smaller than those behind them. In a male from Taita and another from 
Fuladoya the nuchal scales are perceptibly smaller than those of the back ; but the 
difference is slight, and from the variations that occur no importance is to be attached 
to the slight differences in the size of these scales. 
In A. hartmanni the rosettes on the side of the head and neck differ from those present 
in A. bibronii, A. colonorum, and A. spinosa in their little development. In A. spinosa, 
for example, 8 groups of rosettes bearing spiny scales can be counted, one at the 
anterior, another at the posterior border of the ear margin, 3 groups below and behind 
the ear on the lateral aspect of the angle of the lower jaw, a small group on the hinder 
portion of the temporal region, and two large groups on the side of the neck. In 
A. hartmanni there are no distinct rosette-like eminences at the anterior and posterior 
borders of the ear, their place being taken by simply enlarged pointed scales. On the 
temporal region there is a feeble rosette and two equally ill-defined ones behind and 
below the ear, the lowest being in a line with the angle of the mouth. The two 
rosettes on the neck are feebly developed, so that instead of 8 well-developed groups of 
rosettes as in A. spinosa, A. bibronii, &c, there are in reality only 5, the place of the 
others being represented by spines. 
Owing to the almost elementary character of its head and neck spines, this species 
can never be mistaken for A. spinosa. From A. colonorum it is separated by its nostril 
being placed below the canthus rostralis, by its smaller head-spines and longer digits. 
