AMPHILIUS. 307 root of pectoral; outer mandibular barbel 2 length of head, inner ?. Gill-rakers rather long, 7 on lower part of anterior arch. Dorsal I 6, much nearer end of snout than root of caudal. Adipose dorsal low, about twice as long as rayed dorsal, its length about # its distance from latter. Anal III 5-6. Pectoral slightly shorter than head. Ventral as long as pectoral, far behind base of dorsal. Caudal feebly emarginate. Caudal peduncle as long as deep. Brown above, with more or less distinct blackish spots, whitish beneath; fins greyish, dotted with blackish.
Total length 98 millim.
East Africa (Pangani River System).
1-2. Types. Usambara, in rivulet running down from Dr. P. Krefft (P.). Anani Hills to Sigi River.
4. AMPHILIUS PLATYCHIR.
Pimelodus platychir, Giinth. Cat. Fish. vy. p. 134 (1864). Chimarrhoglanis leroyi, Vaill. Bull. Mus. Paris, 1897, p. 62. Anoplopterus platychir, Pfeff. Thierw. O.-Afr., Fische, p. 33 (1896) ; Bouleng. Ann. & Mag. N. H. (7) i. 1898, p. 255, and Trans. Zool. Soc. xv. 1898, p.24.
Amplhilius platychir, Bouleng. Proc. Zool. Soe. 1905, i. p. 64. Pimelodus (Amphilius) wranoscopus, part., Hilgend. Zool. Jahrb., Syst. xxii. 1905, p.411.
Depth of body 54 to 64 times in total length, length of head 4 to 44 Fig.277.
Amphilius platychir.
Type. 4.
times. Head much depressed, slightly longer than broad; snout broadly rounded, as long as postocular-part of head; eye very-small, 7 or 8-times in length of head,.2 to 2} times- in interocular width ; posterior nostril
358 SILURIDZ.
a little nearer eye than end of snout; maxillary barbel 3 to ¢ length of head, reaching or nearly reaching posterior border of head; outer mandibular barbel 2 to 2 length of head, inner about ?. Giull-rakers moderately long, 7 or 8 on lower part of anterior arch. Dorsal I 6, much nearer end of snout than root of caudal. Adipose dorsal low, about twice as long as rayed dorsal, its length about 3 to $ its distance from latter. Anal III 6. Pectoral nearly as long as head. Ventral a little shorter than pectoral, far behind base of dorsal. Caudal with crescentic emargination. Caudal peduncle a little longer than deep. Brownish above, uniform or spotted or marbled with darker; dorsal and caudal more or less distinctly spotted with brown. Total length 85 millim.
East Africa, westwards to Lakes Tanganyika and Nyassa. 1-4. Types. Sierra Leone (?). Dr. A. Giinther (P.). 5. Hgr. Bubu R., German E. Africa. Prof. O. Neumann (C.). 6-7. Ad. Marshes near Mbeti, L. Tan- Prof. J. EH. 8. Moore (C.). ganyika.
8-9. Ad. Between Kondowe and Ka- A. Whyte, Esq. (C.); ronga, L. Nyassa. Sir H.H.Johnston (P.).
10-12. Hyr.& yg. Rh. Ruo, Brit. C. Africa. » 5. AMPHILIUS HARGERI.
Bouleng. Ann. & Mag. N. H. (7) xx. 1907, p. 488. Amphilius hargeri.
Type. 4.3 Depth of body 5} times in total length, length of head 43 times. Head much depressed, slightly longer than broad; snout broadly rounded, nearly 4 length of head; eye very small, 9 times in length of
AMPHILIUS. 359 head, 3 times in interocular width; posterior nostril midway between eye and end of snout; maxillary barbel 14 length of head, outer mandibular 4, inner mandibular 3. Gill-rakers short, 8 on lower part of anterior arch. Dorsal I 6, much nearer end of snout than root of caudal. Adipose dorsal low, twice as long as rayed dorsal, nearly as long as its distance from latter. Anal II 7. Pectoral a little shorter than head. Ventral a little shorter than pectoral, far behind base of dorsal. Caudal emarginate. Caudal peduncle as long as deep. Dark olive above, whitish beneath; five round white spots on the back—one in front of the dorsal fin, one on each side of the last rays of the dorsal, one in front of the adipose fin, and one at the posterior extremity of the latter.
Total length 80 millim.
British Central Africa.
1. Type. Sources of Ruo R., Mlanji, 6500 Ft. R. L. Harger, Hsq. (P.). 6. AMPHILIUS LONGIROSTRIS.
Anoplopterus longirostris, Bouleng. Ann. & Mag. N. H. (7) viii. 1901, p. 447. Amphuilius longirostris, Bouleng. Proc. Zool. Soc. 1903, i. p. 25, pl. i. fig. 3, and 1905, i. p. 64.
Depth of body 6 to 9 times in total length, length of head 32 to 4 times. Head much depressed, 1} to 1} times as long as broad ; snout Fig.279.
Amphilius longirostris.
Type (P. Z. 8. 1903).
obtusely pointed, about 2 length of head; eye very small, in second half of head, 8 to 10 times in length of head, 1} to 2 times in interocular width ; posterior nostril midway between eye and end of snout ;
360 SILURIDZ..
2 maxillary barbel about 3 length of head, reaching root of pectoral or not quite so far; outer mandibular barbel 4 to 2 length of head, inner about 3. Gill-rakers moderately long, 5 or 6 on lower part of anterior arch. Dorsal I 6, much nearer end of snout than root of caudal. Adipose dorsal low, 1 to 14 times as long as rayed dorsal, about half as long as its distance from latter. Anal If 6-7. Pectoral 2 to $ lengta of head. Ventral a little shorter than pectoral, far behind base of dorsal. Caudal with crescentic emargination. Caudal peduncle as long as deep or a little longer than deep. Dark olive-brown above, with darker spots or marblings and usually with 4 to 6 more or less distinct large transverse yellowish spots on the back; fins light, with dark spots, which may be disposed in transverse series; caudal usually with two regular blackish bars, or blackish at the base, with a large blackish blotch on each lobe.
Total length 140 millim.
South Cameroon.
1. Type. Hills in Bulu Country, near G. L. Bates, Esq. (C.). Efulen, 1500-2000 ft.
2-10. Ad. & her. 4 11. Skel. *, 3 12-21. Ad., hgr., & yg, Kribi R. A 22-29. 3 Lobi R. .
7. AMPHILIUS ATESUENSIS.
Amphilius platychir (non Giinth. 1864), Giinth. Proc. Zool. Soc. 1902, il. p. 336. Amphilius atesuensis, Bouleng. Ann. & Mag. N. H. (7) xiv. 1904, p. 17. Amphilius atesuensis.
Type.+4.
Depth of body 5 to 6 times in total length, length of head 4 to 4}
AMPHILIUS. 361 times. Head much depressed, slightly longer than broad; snout broadly rounded, as long as postocular part of head; eye very small, 9 or 10 times in length of head, 2} to 8 times in interocular width ; posterior nostril a little nearer eve than end of snout; maxillary barbel as long as head or a little longer; outer mandibular barbel a little shorter than head, inner about 2 length of head. Gill-rakers moderately long, 7 or 8 on lower part of anterior arch. Dorsal I 5-6, equally distant from end of snout and from root of caudal. Adipose dorsal low, 14 to 14 times as long as rayed dorsal, its length a little greater than its distance from latter. Anal IL 5-6. Pectoral a little shorter than head. Ventral slightly shorter than pectoral, below posterior rays of dorsal. Caudal forked, with rounded lobes. Caudal peduncle a little longer than deep. Brown above, speckled with darker, whitish below ; 6 yellowish crossbars on the back, the first on the nape, the third just behind the dorsal fin; fins whitish, dorsal with a transverse series of small black spots, caudal with a black basal bar and a terminal transverse band of crowded black spots.
Total length 60 millim.
Gold Coast.
1-4, Types. Atesu R. R. B. N. Walker, Esq. (C.) ; Dr. A. Giinther (P.). 8 AMPHILIUS BREVIS.
Bouleng. Proc. Zool. Soc. 1902, i. p. 268, pl. xxix. fig. 3. Amphilius nigricaudatus, Pellegr. Bull. Soc. Philom. (10) i. 1909, p. 47, fig. Depth of body 6 to 7 times in total length, length of head 33 to 4 times. Head much depressed, a little longer than broad; snout broadly rounded, 3 to 2? length of head; eye very small, 9 to 12 times in length of head, 24 to 3 times in interocular width ; maxillary barbel $ to once Fig.281.
Amphilius brevis.
Type (P. Z. 8. 1902).
length of head, rarely a little longer than head, scarcely longer than outer mandibular, inner mandibular 4 to } length of head. Gill-rakers moderately long, wide apart, 7 or 8 on lower part of anterior arch. Dorsal I 6, equally distant from end of snout and root of caudal, or a
362 SILURID#.
little nearer former. Adipose dorsal low, 14 to 2 times as long as rayed ‘ dorsal, 14 to 14 times as long as its distance from latter. Anal IL 5-6. Pectoral 3 to 8 length of head. Ventral below middle or posterior rays of dorsal. Caudal feebly emarginate. Caudal peduncle as long as deep or a little deeper than long. Brown above, uniform or dotted with black, white beneath; caudal peduncle darker towards base of caudal ; fins white, caudal with a large black or blackish blotch, which may be rhomboidal or cruciform.
Total length 62 millim.
Lindi River (Upper Congo), Ogowe, South Cameroon.—lype in Brussels Museum.
1. One of the types. Lindi R., Congo. M. M. Storms (C.) ; Brussels Museum (P.).
2-11. Ad. & hgr. Efulen, 8S. Cameroon. G. L. Bates, Esq. (C.). 12-16. 99 Biwomi R.., op D 9. AMPHILIUS ANGUSTIFRONS.
Anoplopterus angustifrons, Bouleng. Ann. Mus. Congo, Zool. ii. p. 42, pl. x. fig. 4 (1902).
Amphilius angustifrons, Bouleng. Proc. Zool. Soc. 1905, i. p. 64. Depth of body 7 to 8 times in total length, length of head 4 to 43 Fig.282.
Amphilius angustifrons.
Type (A. M.C.). x 2.
times. Head 1} times as long as broad; snout obtusely pointed, 4 length of head; eye moderately large, 6 times in length of head, its
AMPHILIUS.—PARAMPHILIUS. 363 diameter greater than interorbital width; posterior nostril midway between eye and end of snout; maxillary barbel about $ length of head, outer mandibular 3. Dorsal I 7, much nearer end of snout than root of caudal. Adipose dorsal low, about 14 times as long as rayed dorsal, nearly as long as its distance from latter. Anal II 7. Pectoral } length of head. Ventral a little shorter than pectoral, below posterior half of dorsal. Caudal with crescentic notch. Caudal peduncle more than twice as long as deep. Olive above, with 4 or 5 blackish bars, the last at base of caudal.
Total length 45 millim.
Ubanghi.—Types in Congo Museum, Tervueren.
1-2. Types. Banzyville. Capt. Royaux (C.).
21. PARAMPHILIUS.
Pellegr. Bull. Mus. Paris, 1907, p. 23.
Closely related to the preceding. Distinguished by the position of the posterior nostril, which is close to the eye, and by the confluence of the adipose dorsal fin with the caudal.
A single species.
1, PARAMPHILIUS TRICHOMYCTEROIDES.
Pellegr. t. c. p. 24.
Depth of body 7 times in total length, length of head 5 times. Head longer than broad; snout semicircular; eye very small, at the second third of the length of the head; anterior nostril midway between eye and end of snout; interorbital width 3 length of head; maxillary and outer mandibular barbels a little lounger than head, inner mandibular a little shorter. Dorsal I 6, equally distant from end of snout and from root of caudal. Adipose dorsal long and low. Anal III 9. Pectoral ? length of head. Ventral slightly shorter than pectoral, below anterior rays of dorsal. Caudal truncate. Caudal peduncle a little longer than deep. Uniform olive above, yellowish beneath.
Total length 56 millim.
Ditinn, Upper Senegal, 3200 feet.—Type in Paris Museum.
364 SILURIDA.
22. PARAUCHENOGLANIS, g. n.
Body moderately elongate, feebly compressed. Dorsal and anal fins short, the former composed of a spine and 7 branched rays, and followed by a long adipose fin. Pectoral fin with a spine. Ventral fin with 6 rays, inserted below the dorsal fin. Three pairs of barbels: maxillary and two mandibulars. Nostrils widely separated from each other, the anterior tubular, on the upper lip, the posterior slit-like. Eye superior, without free border. Maxillary bone rather large, hidden in the lip but bordering the mouth; jaws with a large band of villiform teeth. Gill-membranes free, deeply notched. Airbladder large, free.
Vertebre 39 (16+25). 10 branchiostegal rays.
Cameroon, Gaboon.
Two species :— Outer mandibular barbel not reaching beyond middle of pectoral fin. . . . . . . I. P. guttatus, Lonnb., p. 364. Outer mandibular barbel reaching extremity OL pectoral ing... oe ea) 2s ase. macrostoma, jbellecieap soo: 1. PARAUCHENOGLANIS GUTTATUS.
Pimelodus guttatus, Linnb. Ofvers. Vet.-Akad. Firh. Stockholm, 1895, no. 3, p.184.
Auchenoglanis guttatus, Bouleng. Ann. Mus. Congo, Zool. ii. p. 40 (1902). Depth of body 5 to 6 times in total length, length of head 3} to 3 times. Head much depressed, 13 to 13 times as long as broad, its upper surface smooth; snout broadly rounded, ? length of head; occipital process small, longer than broad, not reaching the feebly developed interneural plate; eye superior, 7 to 10 times in length of head, 24 to 3 times in interorbital width; mouth broad, terminal ; premaxillary teeth forming a long and broad crescentic band. Maxillary barbel # to # length of head, inner mandibular ? to $, outer mandibular nearly as long as head or a little longer, reaching base or middle of pectoral fin. Gill-rakers rather long and widely set, 10 or 11 on lower part of anterior arch. Humeral process small, pointed, smooth. Dorsal I7; spines smooth, 2 to 4 length of head. Adipose dorsal 4 to 6 times as long as deep, 2 to 3 times as long as its distance from rayed dorsal. Anal 11-12 (7-8 rays branched). Pectoral not reaching ventral ; spine