MICROSYNODONTIS. ATT times in length of head, 14 to 2 times in interorbital width; lips rather strongly developed ; premaxillary teeth forming a short and broad band ; mandibular teeth not more than 4 diameter of eye, 20 to 30 in number. Maxillary barbel simple, as long as or a little longer than head; mandibular barbels with long slender branches, outer longer than inner and a little shorter than head. A fold across the throat, but gill-openings restricted to the sides. Occipito-nuchal shield rugose like the occiput, a little longer than broad, with obtuse or rounded posterior processes. Fig.336.
Microsynodontis batesii.
Type (P. Z.S. 1903).
Humeral process long and narrow, acutely pointed. Dorsal I 6; spine strong, straight, to ? length of head, striated, smooth or with a few very feeble posterior serree in its upper part. Adipose dorsal low, elongate, 2 to 3 times as long as its distance from rayed dorsal. Anal III-IV 8-9, rounded. Pectoral spine strong, shorter than head, striated, feebly serrated on outer border, strongly on inner. Ventral not reaching anal. Caudal rounded. Caudal peduncle about as long as deep. Dark brown or blackish above, with 5 yellow cross-bars, the first on the occiput, the second at the base of the dorsal; the body lower down with round yellow spots; throat and belly greyish or pale brownish, spotted or marbled with dark brown; fins spotted with dark brown, caudal with a yellow bar at the base.
Total length 100 millim.
South Cameroon, Gaboon.
1-7. Types. Mvile R., S. Cameroon. G. L. Bates, Esq. (C.). 8. Skel. 5 a a 9. Her. Near Efulen, 8. Cameroon. Fs 10-11, 12-19. Ad. JaR,, i her., & yg.
20. Her. Bumba R. at Assobam, 8. Cameroon. ss 21-26. Ad., her., Nyong R., ms ty «& yg:
27-28. Her. Gaboon. -
478 SILURID &.
30. CHILOGLANIS.
Peters, Mon. Berl. Ac. 1868, p. 599; Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p- 521, and Fish. Nile, p. 386 (1907). Body moderately elongate, feebly depressed. Anterior dorsal entirely in advance of ventrals, formed of 1 spine and 5 branched rays; an adipose fin opposed to the anal; pectoral with a spine; ventral with 7 rays. A cephalo-nuchal bony shield. Mouth inferior, surrounded by a very large, circular, papillose lip; conical teeth on the premaxillaries and on the vomer; movable, slender, curved teeth in the mandible; a maxillary and two mandibular barbels on each side; nostrils rather remote from each other, both with a valve, the anterior tubular; eyes small, without free border. Gill-openings short, confined to the sides. Air-bladder small, partially enclosed on each side between the enlarged processes of the anterior vertebre. Vertebre 35 (15-16-+ 19-20).
Nile and Tropical Africa.
Synopsis of the Species.
I. Maxillary barbel much longer than eye. A. Dorsal with 5 branched rays.
1. Depth of body 54 to 64 times in total length; caudal peduncle 2 to 24 times as long as deep.
Interorbital width equal to or but slightly greater than distance between posterior nostril and eye ; base of adipose fin 4 to 1 its distance from dorsal. . . . . . 1. C. deckenii, Peters, p. 479. Interorbital width much greater than distance between posterior nostril and eye ; base of adipose fin 2 its distance from dorsal . . 2. C. modjensis, Blgr., p. 480. 2. Depth of body 4 to 5 times in total length; caudal peduncle about 14 times as long as deep ; base of adipose fin 3 to ? its distance from dorsal.
Interorbital width greater than distance between posterior nostril and eye; caudal deeply emarginate . .... . . . 3. C. neumanii, Bler., p. 481. Interorbital width greater than distance between posterior nostril and eye ; caudal feebly emarginate . . . . . . . « 4. C. cameronensis, Bigr., p. 482.
CHILOGLANIS. 479 B. Dorsal with 6 or 7 branched rays ; depth of body 4 to 4} times in total length ; caudal peduncle about twice as long as deep; base of adipose fin equal to or a little less than its distance from dorsal . . . . . . 95. C. niloticus, Blgr., p. 483. II. Maxillary barbel not or but scarcely longer than eye ; depth of body 5 to 6 times in total length ; adipose fin not more than 4 its distance from dorsal.
Anal with 7 branched rays ; interorbital space greater than diameter of eye. . . . . 6. C. brevibarbis, Bler., p. 484. Anal with 5 or 6 branched rays ; interorbital space not or but little greater than diameter Or GO oo co 5 8 oO oe eo 6 to 0 to Os ence, IBlkerr,. in, Cuoe 1. CHILOGLANIS DECKENTI.
Peters, Mon. Berl. Ac. 1868, p. 599, pl. ii., and Decken’s Reise O.-Afr. iii. p. 144 (1869) ; Pfeff. Thierw. O.-Afr., Fische, p. 38, fig. (1896) ; Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 521.
Synodontis eurystomus, Pfett. Jahrb. Hamb. Wiss. Anst. vi. 1889, p. 14, and x. 1893, p. 31, pl. i. fig. 5.
Chiloglanis deckenit.
Type,afterPeters(1.c.).
Body slightly depressed in front, compressed behind, its depth 53 to 64 times in total length. Head strongly depressed, a little longer than broad, its length 3 to 3} times in total length; eye directed upwards, in
480 SILURID&.
second half of head, 5 to 7 times in length of head and 1} to 12 times in interorbital width, which equals or slightly exceeds the distance between eye and posterior nostril; two widely separated oval groups of premaxillary teeth, forming 5 or 4 transverse series ; 6 to 8 mandibular teeth ; maxillary barbel about 3 length of head, a little longer than the outer lower labials. Dorsal I 5; spine not distinctly serrated, 3 to length of head. Adipose fin 4 to 4 its distance from rayed dorsal. Anal III 7-8. Pectoral spine a little longer than the dorsal, at least 3 length of head. Ventral extending to origin of anal or a little beyond. Caudal deeply forked, Caudal peduncle nearly twice as long as deep. Olive-brown, with irregular darker cross-bands; a dark bar at the base of the caudal and another across each lobe of the fin. Total length 70 millim.
German East Africa.—Types in Berlin Museum.
1. Ad. Korogwe, Rufu R. Dr. Stuhlmann (C.) ; Hamburg Museum (H.).
2-6. Ad. Bereza. Dr. E. J. Baxter (C.).
7. Skel. Rs Pi 2. CHILOGLANIS MODJENSIS.
Bouleng. Proce. Zool. Soc. 1903, ii. p. 332, pl. xxxi. fig. 3. Body slightly compressed, its depth 54 times in total length. Head depressed, 13 times as long as broad, its length 3 times in total length. Fig.358.
Chaloglanis modjensis.
Type (P. Z. 8, 1908).
Eye directed upwards, in second half of head, 7 times in length of head, 1% or 2 times in interorbital width, which much exceeds the distance
CHILOGLANIS. 481 between eye and posterior nostril; premaxillary teeth in two large contiguous groups, forming 4 or 5 transverse series; a group of 7 to 9 mandibular teeth; maxillary barbel 4+ length of head, longer than the lower labials. Dorsal I 5; spine not serrated, not quite } length of head. Adipose fin low, its base about # its distance from rayed dorsal. Anal III 6-7. Pectoral spine not serrated, 2 length of head. Ventral extending to a little beyond origin of anal. Caudal peduncle 23 times as long as deep. Dark brown above and on the sides, with three yellowish bars, the first in front of the dorsal fin, the second above the ventral, the third on the caudal peduncle ; lower parts white.
Total length 40 millim.
Modjo River (Webi Shebeli System), Southern Ethiopia. 1. One of the types. Modjo R. Prof. O. Neumann and Baron C. von Erlanger (C.).
3. CHILOGLANIS NEUMANNI, sp. n.
Chiloglanis deckenii (non Peters), Hilgend. Zool. Jahrb., Syst. xxii. 1905, p. 411. Body cylindrical in front, compressed behind, its depth 4 to 4} times in total length. Head depressed, 14 to 14 times as long as broad, its length 3 to 34 times in total length; eye directed upwards, in second half of head, 6 to 7 times in length of bead, nearly twice in interorbital width, which is greater than the distance between eye and posterior Fig.359.
iG i} de ( I9 is fo) a SS Chaloglanis neumanni.
ry, a f Type. ze nostril ; two widely separated oval groups of premaxillary teeth, forming 3 or 4 transverse series; two series of mandibular teeth, 6 to 8 in each ; maxillary barbel about ¢ length of head, a little longer than outer lower labial. Dorsal 1 5; spine not serrated, 3 to § length of head. Adipose VOL. Il. ZI
2, SILURIDZ.
CO cs fin 2 to 2 its distance from rayed dorsal. Anal III 7-8. Pectoral spine as long as dorsal. Ventral extending to origin of anal or a little beyond. Caudal deeply forked. Brownish, uniform or speckled with blackish.
Total length 50 millim.
Bubu River, Masailand.
1-5. Types. Upper Bubu R. Prof. O. Neumann (C.). 4. CHILOGLANIS CAMERONENSIS.
Bouleng. Ann. & Mag. N. H. (7) xiv. 1904, p. 18. Body somewhat depressed in front, compressed behind, its depth 43 to 5 times in total length. Head depressed, 14 times as long as broad, its length 3 times in total length. Eye directed upwards, in second half of head, 7 or 8 times in length of head, 1% times in interorbital width, which equals or is a little less than the distance between eye and posterior nostril ;. premaxillary teeth in two large oval groups, well separated on the middle line, forming 4 or 5 transverse series; a group Fig.360.
Chiloylanis cumeronensis.
, 4 Type. 4.
of 12 to 14 mandibular teeth ; maxillary barbel } to 4 length of head, longer than the lower labials. Dorsal I 5; spine not serrated, about 3 length of head. Adipose fin low, its base about % its distance from rayed dorsal. Anal IIl 5-6. Pectoral spine not serrated, 2 to 2 length of head. Ventral extending to origin of anal or a little beyond. Caudal slightly emarginate. Caudal peduncle 1} times as long as deep. Pale brownish above; head marbled with dark olive and with a cheyron-shaped dark band passing through the eyes, the point on the
CHILOGLANIS. 485 occiput; three broad dark cross-bands on the body, the first behind the dorsal, the second across the base of the adipose fin, the third at the base of the caudal; fins whitish, with a dark band across the caudal. Total length 55 millim.
South Cameroon.
1-7. Types. Efulen. G. L. Bates, Esq. (C.).
8-9. Ad. 9 5. CHILOGLANIS NILOTICUS.
Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 522, and Fish. Nile, p. 386, pl. Ixxvi. fig. 1 (1907).
Body not or but slightly compressed, its depth 4 to 4} times in total length. Head smooth, strongly depressed, a little longer than broad, its length 3 to 34 times in total Jength. Snout broadly rounded; eye directed upwards, in second half of head, 6 times in length of head, Fig.361, Ohiloglanis niloticus, Type (F. N.).
about 14 times in width of interorbital region, which is much greater than distance between posterior nostril and eye. Premaxillary teeth in two large oval groups, narrowly separated from each other; mandibular teeth very small, 6 to 11 in number. Maxillary barbel about 4 length of head, longer than lower labials. Dorsal I 6-7; spine not distinctly serrated, about 2 length of head. Adipose fin low, as leng 212
484 SILURIDA.
as or a little shorter than its distance from rayed dorsal. Anal III 7-8. Pectoral spine not serrated, about # length of head. Ventral extending to origin of anal or a little beyond. Caudal deeply forked, lobes pointed. Caudal peduncle about twice as long as deep. Body pale greyish olive above, with four broad cross-bands of dark olive speckled with blackish, broader than the interspaces between them; head dark olive above; lower parts white or yellowish; rayed fins greyish, the caudal with a horizontal blackish bar on each lobe, the end of which is pale yellow; adipose fin yellowish.
Total length 45 millim.
Upper Nile.
1-7. Types. Arko Id. L. Loat, Esq. (G.).
&. Skel s, 2 9. Ad. Wady Halfa. ” 6. CHILOGLANIS BREVIBARBIS.
Bouleng. Proc. Zool. Soe. 1902, ii. p. 224, pl. xvii. fig. 2. Body slightly depressed in front, compressed behind, its depth 6 times in total length. Head strongly depressed, 1} times as long as Chiloglanis brevibarbis.
Type (P. Z. 8. 1902).
broad, its length 3 times in total length; eye directed upwards, in second half of head, 54 times in length of head, 14 times in interorbital width, which is a little greater than the distance between eye and posterior nostril; premaxillary teeth in two large oval groups, widely