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Show (54 OX FISHES FROM THE KEXYA DISTRICT, E. AFRICA. [Feb. 7, and ventrals, equally distant from end of snout and from middle of adipose fin ; first branched ray g length of head. Adipose fin 5 or 6 times as long as deep, twice and -g- as long as rayed dorsal. Anal III 6, midway between root of ventral and root of caudal. Pectoral a little longer than ventral, £ length of head. Caudal moderately emarginate. Caudal peduncle as long as deep. Olive-brown above, with very indistinct darker marblings, brownish white below. Total length 180 millimetres. Three specimens, from the Chania River of Tetse, Tana system, in cold water, at an altitude of 7000 feet. This new Amphilius is the largest yet described, exceeding in size the A. longirostris of South Cameroon (originally described from an immature specimen), which grows to a length of 140 millimetres. The genus Amphilius Gthr. (Anoplopterus Pfeff., Chimcirrho-glanis Vaill.), until quite lately represented by two known species only, now includes as many as seven, the characters of which may be thus contrasted :-- I. Dorsal above the space between pectorals and ventrals. A. Head not or but slightly longer than broad; snout broadly rounded, its length not more than twice interocular width; base ot adipose tin much longer than that of rayed dorsal. Length of head at least 5 times in total length; maxillary barbel extending beyond posterior border of head; caudal peduncle not longer than deep ........................................................................... A. uranoscojpus Pfeff. 1896. Length of head 4 times in total length ; maxillary barbel not reaching posterior border of head; length of snout once and § to twice interocular width ; caudal peduncle not longer than deep ... A. grandis Blgr. 1905. Length of head 4 to 4|- times in total length; maxillary barbel not extending beyond posterior border of head; length of snout once and g to once and | interocular width ; caudal peduncle longer than deep ............................................................ A. platychir Gthr. 1864. B. Head longer than broad; snout obtusely pointed, its length 2 (young) to 3 times inter-ocular width ; base of adipose fin not more than once and a half that of rayed dorsal... A. longirostris Blgr. 1901. II. Dorsal above the ventrals. Length of head 4 to 4J times in total length ; snout broadly rounded; interocular width 2 j to 3 times diameter of eye; caudal peduncle a little longer than deep; caudal forked, with rounded lobes .. A. atesuensis Blgr. 1904. Length of head 3§ to 3 f times in total length ; snout broadly rounded; interocular width 2J to 3 times diameter of eye ; caudal peduncle as long as deep ; caudal feebly emarginate........................... A. brevis Blgr. 1902. Length of head 4 to 4^ times in total length; snout pointed; interocular width not greater than diameter of eye; caudal peduncle more than twice as long as deep; caudal emarginate............ A. angustifrons Blgr. 1902. E X P L AN A T IO N OF PLATE V I I . Fig. 1. Discognathus hindii, p. 62. 1 a. „ „ Upper view of head. 1 b. „ „ Lower view of head. 2. Barbus thikensis, p. 63. 3. Amphilius grandis, p. 63. 3 a. „ „ Upper view of head. |
