1895,] THE JLVMilALS OF ADEN. 545 



reason assigned to one or other of two forms usually supposed to 

 be quite distinct. 



This very difficulty, however, renders the present collection all 

 the more valuable as an 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 Jmmadri/as and 

 Arvicanthis variegatus, while the same number {Hystvix hucura and, 

 if correctly determined, Gazella bennetti) are Indian. The Bats 

 are nearly wholly African. 



1. Papio hama_db,tas (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 Kange stated that a flock of 12 or 13 

 iudi\iduals frequented the crest of the ridge. Monkeys were 

 heard near the last locality but not seen. 



2. Xanthabpxia STEAJiXNBA, Geoffr. 



a-e. 5 specimens. Lahej. 



These Bats were plentiful in the Sultan'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. Xaxthaepxia ^gyptiaca, Greofiir. 

 o-i. 9 specimens. Lahej. 21-29. III. 95. 



In great numbei's 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 fcetuses only. 



We use the name mjiiptlaca provisionally, as there does not 

 seem to be any tangible difference between these specimens and 

 examples from Egypt ; but the proper relationships of and differ- 

 ences between X. cegr/ptiaca, X. amplexicaadata, and X coUaris much 

 need investigation with larger material 



4. Teijenops peksicus (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 



Pboc. Zool. Soc— 1895, No. XXXV. 35 



