10 Mr. G. A. Boulenger on 
I].—Deseriptions of Three new Siluroid Fishes of the Genus 
Synodontis discovered by Mr. W. L. S. Loat in the White 
Nile. By G. A. BOULENGER, F.R.S. 
Synodontis caudovittatus. 
Depth of body 3 to 34 times in total length, length of head 
382 to 4. Snout rounded, smooth, as long as or slightly 
longer than postocular part of head; interorbital region 
granular, its width 2 to 24 in length of head; eye supero- 
lateral, its diameter 43 to 5 times in length of head; max- 
illary barbel without fringe, 14 to 13 length of head; man- 
dibular barbels with long slender branches, those of the inner 
with tubercular ramifications. Outer mandibular teeth shorter 
than the eye, 33 to 38. Occipito-nuchal shield obtusely 
tectiform, with pointed or truncated posterior processes. 
Humeral process not keeled, sharply pointed, extending as 
far as nuchal or not quite so far. Dorsal 17; spine as long 
as or a little shorter than head, feebly serrated behind, with 
short or rather long filamentous prolongation. Adipose fin 
3 to 4 times as long as deep, 3} to 5 times as long as its 
distance from dorsal. Anal 1V 8, rounded. Pectoral spine 
as long as or a little shorter than head, feebly but distinctly 
serrated on outer edge, very strongly on inner, reaching or 
nearly reaching ventral. Latter rounded, extending to or 
slightly beyond origin of anal. Skin smooth, not villose. 
Grey, tinged with olive on the head and back; caudal fin 
whitish, with a deep black band along each lobe; barbels 
white. 
Total length 240 millim. 
Several specimens from the mouth of Lake No. 
Allied to S. frontosus, Vaill. Differs in the total absence 
of a fringe to the maxillary barbel, the larger eye, the rounded 
ventrals and anal, and the black bands on the caudal. 
Synodontis filamentosus. 
Depth of body equal to length of head, 4 times in total 
length. Snout obtusely conical, smooth, as long as post- 
ocular part of head; interorbital region rugose, its width 4 
length of head; eye superior, its diameter 34 times in length 
of head; maxillary barbel broadly fringed at the base, 4 
length of head; mandibular barbels with numerous long 
ramified branches. Outer mandibular teeth barely + length 
of eye, 20 in number. Occipito-nuchal shield obtusely tecti- 
