356 SILUBIM. 



have, as a rule, a somewhat shorter body, a deeper adipose dorsal flu, and a broader 

 humeral process, as compared with the typical form from the Lower Nile ; but these 

 differences are bridged over by the specimens from the White Nile, and I therefore 

 agree with Steindachner and with Vaillant in uniting them all under the same specific 

 name. 



The Senegalese specimens approach very closely the S. gambiensis, Gthr., separated 

 by the absence of the villosities on the body. Among the species with villose sides, 

 S. depauwi, Blgr., from the Congo, is distinguished by having the snout much longer 

 than the postocular part of the head, and S. geledensis, Gthr., from the Webi Shebeli, 

 has an anteriorly serrated dorsal spine and a broadly fringed maxillary barbel, characters 

 in which it agrees with S. serratus, R/iipp. 



The Congo (Mobaka) specimens recorded by Vaillant have been referred by me * to 

 S. greshoffi) Schilth., and S. alberti, Schilth. The young specimens from the Rovuma 

 River (Livingstone's collection), mentioned in the British Museum Catalogue, probably 

 belong to S. nebulosus, Peters. And, finally, I may acid that the record of this fish 

 at the Cape of Good Hope (Van Horstock, Leyclen Museum) is altogether incredible, 

 and as the determination has been verified as correct by Prof. Vaillant f, an error must 

 have taken place in the labelling of the specimen. 



List of specimens examined : — 



2 Lower Nile.— Petherick, 1861. 



8 Near Ghet-el-Nassara, L. Menzaleh, in freshwater pool. — Loat, 4-11.6.99. 



4 Near San, in freshwater canal. — Loat, 27.6.99. 



22 Nile near Samannud.— Loat, 12-22.7.99. 



38 Rosetta branch of Nile, downstream side of barrage. — Loat, 28-31.7.99. 



2 Cairo.— Riippell, 1828-1834. 



4 Cairo.— Riippell, 1828-1834. (Types of S. maculosus.) 

 8 Nile at Cairo.— Loat, 10-19.3.99, 24.6.00, 1.7.00. 



6 Nile near Cairo, upstream side of barrage. — Loat, 4.8.99. 



2 Nile near Cairo, bought in Old Cairo Fish Bazar, — Loat, 4.4.99. 



40 Near Cairo, in a canal by side of road leading to Pyramids of Giza. — Loat, 7.3.99. 



1 Near Cairo.— Capt. Flower, 10.6.06. 



1 In a canal in Zoological Gardens, Giza. — Loat, 21.3.99. 



3 Giza.— Capt. Flower, 1899, 1904. 

 48 Beni Souef.— Loat, 12-28.8.99. 



1 Sanhur.— Loat, 5.10.99. 



1 Birket Karun, Fayum. — Loat, 30.9.99. 



5 Bahr Selah, Fayum.— Loat, 5.10.99. 



Poiss. Bass. Congo, p. 317. 



N, Arch. Mus. (3) viii. 1896, p. 97. 



