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Show 1895.] THE MAMMALS OF ADEN. • 545 reason assigned to one or other of two forms usually supposed be quite distinct. This very difficulty, however, renders the present collection all the more valuable as au aid to future workers on the subject. It may be noted that only two terrestrial non-volant species can be said to be distinctly African, namely, Papio hamadryas and Arvicanthis variegatus, while the same number (Hgstrix leucura and, if correctly determined, Gazella bennetti) are Indian. The Bats are nearly wholly Africau. 1. PAPIO HAMADRYAS (L.). The Aden Monkey is recorded under this head by Matschie. No specimen was brought home by Yerbury, but one was seen at Haithalhim in March. In Aden itself the Lascars at the signal-station on the Shum Shum Range stated that a flock of 12 or 13 individuals frequented the crest of the ridge. Monkeys were heard near the last locality but not seen. 2. XANTHARPYIA STRAMINEA, Geoffr. a-e. 5 specimens. Lahej. These Bats were plentiful in the Sultau's garden at Lahej on the occasion of the first visit on March 5 : they frequent the tops of the tallest palm-trees, where they collect in large ball-like clusters, but are by no means easy to see; in fact, were it not for the characteristic Flying Fox chattering that they keep up incessantly they would probably be overlooked altogether. After being shot at on the above-mentioned date the bulk disappeared and only one or two stray specimens were seen up to date of departure from Lahej at the end of the month. 3. XANTHARPYIA ^EGYPTIACA, Geoffr. a-i. 9 specimens. Lahej. 21-29. III. 95. In great numbers in a cave on the banks of the Wady Jughur near Lahej. A female, killed on the 29th, had a single young one at her breast, and other gravid females had single foetuses only. W e use the name eeggptiaca provisionally, as there does not seem to be any tangible difference between these specimens and examples from Egypt; but the proper relationships cf and differences between X. eeggptiaca, X. amplexicaudcda, and X. collaris much need investigation with larger materiaL 4. TRI^ENOPS PERSICUS (Dobson). a-e. Cave on island in Ras Fakoum Bay (Little Aden). 6. IV. 95. In great numbers at this locality on the above date. There were a few foxy-red specimens (one of which was obtained) to be seen among the others. As to the cause of the foxy colour observable iu certain individuals we are quite unable to make any suggestion. All the specimens PROC. ZOOL. Soc-1895, No. XXXV. 35 |