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Show 436 MR. F. E. BEDDARD ON THE [Mar. 15, by : (1) the absence of the black superciliary band ; (2) the white colour of the nose-spot and of the hairs upon the ears; (3) the presence of the occipital band; (4) the grizzled colour of the forearm ; and (5) by the restriction of the red on the tail to the proximal half of its under side. The constancy of the above-mentioned characters in C. erythrotis has been tested upon five skins, four of which, including the type, are in the collection of the British Museum; the other, belonging to the Zoological Society, is that of a specimen that lived for four years in the Gardens, and was mentioned by Dr. Sclater in his monograph of the genus Cercopithecus (P. Z. S. 1893, p. 246). This specimen is ticketed Fernando Po ; and the same locality is assigned to the type and to two other skins in the British Museum, the remaining skin in that institution being labelled " W . Africa, G. Burton." The last-mentioned skin was taken from a small and presumably very young individual. The length of the body from the occipital intei-aural area to the root of the tail is about 10| English inches (= 263 mm.), and the tail itself about 16 English inches (400 mm.). It is thus a much smaller Monkey than the type of C. sclateri, and proves beyond doubt that the coloration of the young C. erythrotis is practically the same as the adult, except that the back and tail are darker and less rufous. Hence it may be inferred that the coloration of the type of G. sclateri would not have altered appreciably had the specimen lived to maturity. It is unfortunate that none of the British Museum skins of C. erythrotis are sexed. The one belonging to the Zoological Society is a female; and since the only known example of C. sclateri is a male, it is conceivable that the differences pointed out above are sexual. But the analogy of C. cephus, a nearly related form, in which the sexes are alike in colour, affords no support to such a conception. Finally, it may be interesting to point out that the principal points of difference between C. sclateri and C. erythrotis may be ascribed to a deficiency of red pigment in the hairs upon the nose, the ears, and the greater part of the tail. In fact G. erythrotis might with some justice be described as an erythristic form of C. sclateri, so far, at least, as the areas named are concerned. 4. Contributions to the Anatomy of the Lacertilia.-(1) On the Venous System in certain Lizards. By F R A N K E. B E D D A R D , M.A., F.R.S., Prosector to the Society. [Received February 23, 1904.] (Text-figures 88-94.) I have found that the best method of studying the venous trunks of these lizards is to divide the anterior abdominal vein and then to inject both anteriorly and posteriorly ; no valves stop |
