DISCOGNATHUS. 



18? 



Measurements (in millimetres) and numbers of scales in the lateral line. 



Total length 



Greatest depth 



Length of head 



Width of head 



Length of snout 



Diameter of eye 



Interorbitai width 



Width of mouth 



Longest ray of dorsal 



,, „ anal 



Length of pectoral 



Number of scales in lateral line 



1. 



2 



o. 



4. 



5. 



6. 



7. 



8. 



142 



120 



85 



82 



75 



60 



58 



56 



24 



18 



17 



16 



15 



12 



10 



10 



29 



24 



19 



18 



16 



14 



13 



13 



22 



17 



14 



14 



12 



10 



9 



8 



14 



13 



9 



9 



7| 



H 



6 



6 



4 



4 



4 



4 



H 



H 



3 



3 



12 



9 



8 



8 



H 



6 



H 



6 



14 



11 



8 



8 



6 



6 



6 



5 



' 27 



23 



10 



17 



13 



13 



12 



13 



22 



18 



12 



12 



10 



10 



10 



10 



28 



23 



16 



17 



15 



13 



13 



13 



39 



40 



40 



40 



38 



38 



37 



38 



1. Metti K., Gudar.— Zapbiro. 



2. Gibe E., Omo. — Zaphiro. 



3, 4, 6, 8. Bahardar, L. Tsana. — Degen. 

 5, 7. Nairobi E., Kilimanjaro. — Percival. 



A closely allied Abyssinian and Erythrean species, which has not been found in the 

 Nile system, is D. blanfordii, Blgr., differing in the more anterior position of the eyes, 

 the longer barbels, and the generally lower number of scales in the lateral line, 

 viz. 33 to 37. D. makiensis, Blgr., from Southern Ethiopia, also differs in the more 

 anterior position of the eyes and the longer barbels ; the scales in the lateral line 

 number 38 to 40. D. rothschildi, Pellegr., from the Gota Eiver (Hawash system), 

 which is only known to me from the description, appears to agree so closely with 

 D. dembeensis that I entertain doubts as to its validity as a species ; however, it 

 appears to have a higher dorsal fin, its first branched ray being described as a little 

 longer than the head. 



