HETEBOBBANCHUS. 305 



the outer border and measuring half (young) to six-sevenths the length of the tin. 

 Ventral fin a little shorter, midway between the end of the snout and the base of the 

 caudal fin, or a little nearer the latter. Caudal fin rounded, half to two-thirds 

 the length of the head. 



Olive above, whitish beneath, sometimes with scattered black blotches ; dorsal and 

 anal fins pale olive, darker towards the edge, which may be margined with red ; caudal 

 fin yellowish or pale orange at the base, with a more or less distinct blackish crescentic 

 band, sharply defined in front, shading off to yellow or red behind ; adipose dorsal fin 

 often blackish at the end. Iris bronze colour, with a gold circle round the pupil. 



The largest specimen examined by me measures 720 millimetres. 



II. longijilis is known from the Nile, between Luxor and Khartum, the Omo system, 

 the Niger, and the Congo. I can see no reason for separating Peters's H. laticeps, 

 described from Mozambique (Zambesi, Pomfa, and Licuare Rivers). 



List of specimens examined : — 



1 Nile.— Old Collection. 



1 Luxor.— Loat, 21.10.00. 



8 Between Luxor and Assuan. — Loat, 9-10.00. 



2 Assuan.— Loat, 8-20.9.00. 



5 Kosheh.— Loat, 10-17.3.00. 



1 Khartum, in a rain-water pond. — Petherick, 1863. 



2 Cojeb P., affluent o£ Omo P., 2500 feet.— Zaphiro, 25.5.05. 



6 Agberi, S. Nigeria. — Dr. Ansorge, 1901. 



1 Kasai District, Congo. — Demeuse, 1898. 



2 Monsembe, Upper Congo. — Pev. J. H. Weeks, 1901. 



I have also examined the type of H. longijilis in the Paris Museum. It is a badly 

 preserved specimen, measuring 520 millimetres. It has 26 gill-rakers on the anterior 

 arch, and the pectoral spine measures two-thirds the length of the fin. The nasal 

 barbel measures half the length of the head, the maxillary barbel once and one-fifth. 



//. isopterus, Bleeker, from the Gold Coast, is very closely allied to H. longifilis, but 

 the pectoral spine is longer, measuring at least three-fourths the length of the fin in 

 young specimens, the gill-rakers number 18 to 20, and the coloration is different. 



2k 



