272 



CYPKINID^E. 



three-fifths to two-thirds the length of the head. Anal fin with III 16-19 rays, the 

 first branched ray longest and as long as or a little shorter than that of the dorsal. 

 Pectoral fin acutely pointed, longer than the head, extending beyond the root of 

 the much shorter ventral. Caudal fin deeply forked. Caudal peduncle once and 

 two-thirds to twice as long as deep. Scales with radiating striae, 37-41 -^r- 2 , 1 or 1J 

 between the lateral line and the root of the ventral, 12 round the caudal peduncle. 



The body is uniform silvery, brownish olive on the back ; the fins are yellowish 

 white. 



The specimens collected by Mr. Loat measure from 15 to 55 millimetres. 



Measurements (in millimetres). 



Total length (without caudal) 

 Greatest depth of body .... 



Length of head 



Width of head 



Length of snout , 



Diameter of eye 



i Interorbital width 



Longest ray of dorsal 



,, „ anal 



Length of pectoral 



1. Assuan. — Loat. 



2. Omdurman. — Loat. 



3. Between Luxor and Assuan. — Loat. 



1. 



2. 



3. 



4. 



5. 



6. 



50 



47 



40 



37 



35 



28 



12 



11 



8 



8 



8 



6 



11 



11 



9 



9 



8 



6 



5 



5 



H 



4 



4 



2 i 



3 



3 



H 



H 



H 



H 



3 



3 



2 i 



H 



2j 



2 



4 



4 



3 



3 



3 



2^ 



7 



6 



H 



5 



5 



4 



6 



6 



H 



5 



5 



4 



16 



13 



ii 



10 



10 



8 



4. Gondokoro. — Loat. 



5. Imi, Somaliland. — Paris Mus. 

 (3. Luxor. — Loat. 



The variation in the number of anal fin-rays and scales in the lateral line, in seventy 

 specimens, is as follows : — 16 branched rays in the anal nineteen times, 17 thirty-one 

 times, 18 twelve times, 19 eight times; 37 scales in the lateral line four times, 38 

 twenty-three times, 39 twenty-one times, 40 twenty times, and 41 twice. 



I have not been able to detect any external sexual characters. Chelcethiops bibie is 

 very closely allied to the type of the genus, C. elongatus, Blgr., from the CoDgo and 

 Ubanghi, which differs in the more elongate body (depth five and a half times in 

 length j, the more posterior position of the dorsal fin (above middle of anal and more 



