390 



silueim:. 



Caudal fin deeply emarginate, upper lobe the longer. Caudal peduncle nearly twice as 

 long as deep. 



Pale yellowish or greyish olive above, speckled and marbled with blackish ; two more 

 or less regular dark bands across the back, one under each of the dorsal fins ; belly 

 white ; dorsal and caudal fins yellowish, dotted or spotted with blackish ; iris bronzy 

 brown. 



Total length 65 millimetres. 



This remarkable little Silurid inhabits the Nile, from Beni Souef to Gondokoro, and 

 Lake Euclolf. It was first discovered at Luxor by de Joannis, bat the figures given 

 by him are very incorrect, as may be inferred from the discrepancies between them ». 

 I have examined the following specimens : — 



3 Beni Souef.— Loat, 31.8.99. 



31 At regulators near Luxor. — Loat, 8.10-12.11.00. 



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



6 Assuan.— Loat, 15-30.9.00. 



3 Kaka, White Nile, in a kore.— Loat, 18.4.01. 

 1 Tonga.— Loat, 25.1.01. 



4 Lake No.— Loat, 7.2.01. 



1 Gondokoro. — Petherick, 1862. (Type of Rhinoglanis typus.) 

 9 Gondokoro.— Loat, 20.1-22.2.02. 



Also the types of Rhinoglanis vannutellii, from Lake Rudolf, preserved in the Genoa 

 Museum. 



2. MOCHOCUS BREVIS. 



(Plate LXXVI. fig. 3.) 



Boulenger, Ann. & Mag. N. H. (7) xviii. 1906, p. 148. 



Easily distinguished from the preceding by the shorter caudal part of the body, the 

 first dorsal fin being equally distant from the end of the snout and from the root of the 

 caudal, or a little nearer the former. Depth of body three and a half to four and one- 

 third times in the total length, length of head three to three and a half times. Occiput 

 and nuchal shield slightly tectiform, but without a keel. Maxillary barbel reaching the 

 extremity of the ventral fin or a little beyond. First dorsal fin with I 6 rays, the spine 

 without any serration and always shorter than the head ; second dorsal fin with 9 to 

 17 rays ; anal fin with 9 or 10 rays. No scutes at the sides of the soft rays of the first 

 dorsal fin. Pectoral spine reaching the root of the ventral fin, with 6 to 10 very strong 

 serrse on the inner side. Caudal peduncle only a little longer than deep. 



* The types do not appear to have been preserved. 



