new Fis/irs from Lahf liftorui. 4 '35 



Xunieroiis specimens from tlic mouth of the Katonga 

 Kivcr. 



Distiiifiuisliccl from M. Isidori, C. & \\, l)y tlio sliorter 

 dorsal Hn, the shorter eaiulal pe(hiiu.'h\ the Larger mouth, 

 and ;'euerallv lewer seales in the hiteral line. 



Characinidae. 



Alcstes Sadlcri. 



Depth of hody 'i| to i\\ times iu total lengtli, leugth of 

 head I times. Snout rounded, not projecting beyond the 

 lower lip, a little shorter than the eye, tlie diameter of which 

 is .'. length of head : iuterorI)ital width r length of head, 

 (j ill-rakers long and slender, 18 on lower ])art of anterior 

 arch. Dorsal II 8, just behind vertical of ventrals, e(iually 

 distant from occiput and from root of caudal ; first branched 

 ray as long as head. Anal III 16-17. Pectoral as long as 

 head. Caudal peduncle barely once and ^ as long as deep. 

 Seales 33 !"; , 2 between lateral line and ventral. Steel-blue 

 above, silvery white below ; fins orange-red ; a black (in life 

 brilliant orange) blotch on the caudal peduncle, e.vteuding 

 on the miildle rays of the caudal fin. 



T(>tal length 91 mm. 



Two specimens from iMitebbe. 



This new species is named after Lieut. -Col. Hayes Sadler, 

 11. M. Commissioner, Uganda Protectorate, at the time of 

 Mr. Degen's visit. It is easily distinguished from A. nurse, 

 Riipp., which is common in the lake, by the more posterior 

 position of the dorsal fin, by the greater number of rays in 

 the anal fin, anil by one series more of seales between the 

 origin of the dorsal fiu aiul the lateral line. 



Cyprinidae. 

 Biirbus luhogeuys. 



Depth of body equal to or a little greater than length of 

 head, .3.^ to 1,1 times in total length. Snout rounded, dis- 

 tinctly projecting l)eyond the moiith, longer than the eye, the 

 diameter of which is Wf^ (young) to o^- times in length of 

 liead ; intcrorijital width 2^ to 3 times in length of head ; 

 width of mouth \ to \ length of h(>ad : lips strongly (\v\ clopt d, 

 the upper more or less produced into a point, the low(>r 

 continuous across the chin and often prcduccd into a long 

 rounded mental lobe ; barbels two on each side, anterior jj 



