On Mammals from the Eastern Desert of Egypt. 155 



carrying Trypanosoma Brucei, the litematozoon causing the 

 fatal maladj among domestic animals known as tsetse-fly 

 disease or Nagana. Brumpt is inclined to think that Sleeping- 

 Sickness may also be transmitted by several species of tsetse- 

 flies, and the mere possibility that this may ultimately prove 

 to be the case lends peculiar importance to the bionomics of 

 these interesting Diptera. 



XXIir. — Description of a neio Fish of the Genus Alestei/Vowi 

 Natal By G. A. Boulenger, F.R.S. 



Alestes nafalensi's. 



Depth of body equal to length of head_, 3| times in total 

 length. Head twice as long as broad, once and ^ as long as 

 deep ; snout rounded, not projecting beyond lower jaw, ^ 

 diameter of eye, wliicli is 3 times in length of head ; adipose 

 eyelid feebly developed ; interorbital width ^ length of head ; 

 maxillary not reaching to below anterior border of eye ; 16 

 teeth (I) in the upper jaw ; lower border of second suborbital 

 as long as eye. Gill-rakers long and slender, 21 or 22 on 

 lower part of anterior arch. Dorsal II 8, above ventrals, 

 equally distant from centre of eye and from root of caudal ; 

 flrst branched ray nearly as long as head. Adipose fin 

 small, twice and a half as far from rayed dorsal as from 

 caudal. Anal III 19, longest ra}' nearly half length of heal. 

 Pectoral | length of head, not reaching base of ventral. 

 Caudal deeply forked. Caudal peduncle once and a half as 

 long as deep. Scales 33 3!, 2 between lateral line and root 

 of ventral. A blackish lateral stripe, extending to the median 

 rays of the caudal fin. 



Total length 85 millim. 



Two specimens from near Durban, received from Mr. F. W. 

 Quekett. 



Nearest ally A. lateralis, Blgr., from Lake Dilolo, Katanga, 

 with which species it may ultimately have to be united. No 

 Alestes has hitherto been recorded from south of the Zambesi. 



XXIV. — On some small Mammals collected hy Air. A. M. 

 MackilUyin in the Eastern Desert of Egypt. By Oldfielu 

 Thomas. 



Mk. Arthur M. Mackilligin has recently collected some 

 small mammals in the eastern desert of Egypt, near the 

 Soudan frontier, about lat. 22" and long. 35°, and these prove 



