14 
THE MAMMALS OE EGYPT. 
Islands) cover in a general way the distribution of the foregoing two forms, which aie 
closely allied to one another. They have similarly coloured scrotums, or nearly so, as 
F. Cuvier describes the scrotum of the Callitriche as green, and that of the Grivet as 
copper-green. The C. gviseoviridis^ Uesmarest, is stated by its describer to have a 
green scrotum like C. callitrichus, F. Cuvier ; whereas Martin, and recently Sclatei, 
say that the blue scrotum of this species distinguishes it from its M est-African 
representative, C. callitrichus. As a matter of fact, the only West-African monkey 
of this group with a blue scrotum is the Malbrouck [C. cynomrus). The colour 
of the scrotum after death becomes modified in some of these monkeys, and 
consequently in Martin’s description of the Grivet, drawn up from a skin, the 
scrotum is described as turquoise coloured, whereas that of the Callithrix is said 
to be green. It is also generally stated that the hairs around the scrotum of the 
Callithrix are yellowish, while those in a similar position in the Grivet are white. 
This is due to the fact that the hair of the under parts of the Callithrix exhibit a 
yellowish tint, whereas in the corresponding parts of the Grivet this tint is absent; but 
the difference is only one of degree. The two forms are unquestionably very closely 
allied ; and, indeed, it seems a just view of their relationship to regard them as merely 
geographical races of a single species. Further, one of the features supposed to be 
distinctive of the Callithrix was the yellow tip to its tail, whereas in the Grivet the 
tail was defined as grey throughout. This trivial distinction cannot stand, because 
Is. Geoffroy St.-Hilaire ^ has pointed out that monkeys in Abyssinia, conforming in 
other respects to C. sabceus, have the end of their tails marked with yellow. The 
species described by Blyth ^ under the name C. chrysurus, but the origin of which was 
unknown, seems to have been closely allied to the western Callithrix, and, as some¬ 
times happens in it, C. chrysurus had not a white frontal band ; its tail is yellow and 
its whiskers dingy white. Hartmann has regarded it as a synonym of C. salcBus, but 
it appears to me to be intermediate between the Callithrix and Grivet. I have also 
directed attention® to a similar coloration in an adult male Grivet collected by 
Blanford at Adigraf, Tigre. 
Is. Geoffroy St.-Hilaire thought that the term applied to it, ‘ Singe de Saba,’ taken 
in conjunction with Linnaeus’s mention of Egypt as one of the localities in which it 
occurred, helped to strengthen the evidence existing in the description that the Grivet 
of F. Cuvier was the Simia sahcea, Linn. The difficulty, however, is to understand what 
locality was meant by ‘ Saba.’ The most noted place of this name was Saba in Arabia 
Felix; but although the Hamadryas baboon exists in some parts of Southern Arabia, 
there is as yet no evidence on record that a species of Cercognthecus is indigenous there 
as well. A port also called Saba was situated on the Ethiopian coast of the Bed Sea, in 
1 Cat. Method., Mamm. 1851, p. 22. 2 Journ. As. Soc. Beng. xiii. 1844, p. 477. 
3 Cat. Mamm. Ind. Mas. i. 1881, p. 57. 
