(hi Mannnals fiviii the Eastern Ih-sert ofEjiJi't. 1 '>.■> 



carrying Tryiianosoma Brncei, llie iKLMiiatozoon causing tlie 

 fatal malady among domestic anin)als known as tsctse-Hy 

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

 Sickness may also be transmitted by several species of tsetse- 

 fiics, and the mere possibility that this may ultimately ])rovc 

 to be the case lends j)eculiar importance to the bionomics of 

 these interesting Diptera. 



XXIII. — ])e$ci'n>tion of a new Fish of the Genus Alestcs /'roni 

 ^'uta/. By'G. A. BOULEXGEK, F.R.S. 



Alestcs natalensis. 



Depth of body equal to length of head, 3^ times in t')tal 

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

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

 diameter of eye, which is 15 times in length of head ; adipose 

 eyelid feebly develo|!ed ; interorbital width ^ length of head ; 

 maxillary not reaching to below anterior border of eye ; 16 

 teeth (^) in the up].er jaw ; lower border of second sub)rl)ital 

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

 lower part of anterior arch. Dorsal II 8, above ventral.-, 

 equally distant from centre of cyo, and from root of caudal ; 

 first branched ray nearly as long as head. Adipose (in 

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

 caudal. Anal 111 11>, longest ray nearly half length of hea 1. 

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

 Caudal deeply forked. Caudal peduncle once and a half as 

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

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

 rays of the caudal tin. 



Total length 85 millim. 



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

 Quekett. 



^'carest ally A. lateralis, B'gi-, fi'om Lake Dilolo, Katanga, 

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

 Alestes has hitherto been recorded from south of the Zambesi. 



XXIV. — On some stimll }fam7nnls collected by ^fr. A. ^f. 

 Mackillijin in the Eastern Desert of Eijyid. Jiy OldfielD 

 Thomas. 



Mr. AKTiiuii ^I. Mackilligin has recently collected some 

 small mammals in the eastern desert of Egvpt, near the 

 Soudan frontier, about lat. 22' and long. 35°, au'l the.>e [irovc 



