SOME FISHES OF ORDER AMPHIPRIONIFORMES.— WHITLEY. 
217 
Family CHROMJDtE. 
Tetradrachmum melanurus (Bleeker). 
(Text-fig. 1.) 
Dascyllus aruanus var. a. “ pinna caudali postice nigra ” Bleeker, Nat. Tijdschr. Ned. Ind. ii, 
1851, p. 246. Sumbawa, East Indies. 
Dascyllus melanurus Bleeker, Nat. Tijdschr. Ned. Ind. vi, 1854, p. 109. Sumbawa, &c., East 
Indies. Id. Gunther, Cat. Fish. Brit. Mus. iv, 1862, p. 12, and Journ. Mus. Godef. xv 
(Fische Siidsee vii), 1881, p. 236 (not plate). 
Tetradrachmum melanurus Bleeker, Ned. Tijdschr. Dierk. i, 1863, p. 231 (fide Weber & Beaufort, 
1911). Id. Bleeker, At]. Ichth. ix, 1877, pi. ccccix, fig. 1 and Natuurk. Verh. Holl. 
Maatsch. Wetensch. (3) ii, 6, 1877, pp. 144 & 149. Id. Weber & Beaufort, Fish. Indo- 
Austr. Arehip. i, 1911, p. 385 (references). 
Pomacentrus onyx De Vis, Proc. Linn. Soc. N. S. Wales viii, 4, Feb. 21, 1884, p. 451. South Seas. 
Type in Queensland Museum seen. 
Tetradrachmum mclanurum Steindachner, Abhand. Senckenberg Ges. xxv, 1900, p. 438 (fide 
Fowler & Bean, 1928). 
Dascyllus (Dascyllus) melanurus Fowler & Bean, Bull. U. S. Nat. Mus. 100, vii, 1928, pp. 14 & 
20 (references). 
Re-description of Pomacentrus onyx De Vis. 
D.xii/13 : A.ii/12 ; P.15 ; V.i/5 ; C.15. Lateral line with 17 tubes. Sc. 23. 
L.tr.3/1/8. 
Head (12 mm.) 2*8 in length to hypural joint (34). Depth (21) 1-6 in same. 
Eye (5) 2-4, interorbital (4-5) 2*6, snout (3) 4*0 in head. 
Profiles markedly convex, the upper more so than the lower. Head almost 
entirely scaly. Eye large ; interorbital broad, convex. Snout bluntly rounded. 
Suborbital and preoperculum with small, regular serrations ; other opereles entire. 
Jaws subequal. Maxillary reaching to below anterior half of eye. A row of small 
conical teeth in each jaw. 
Body elevated, compressed, covered with ctenoid scales which are largest 
on the sides, in about 23 transverse rows between operculum and hypural joint, 
and extending on to the fins. Lateral line originating over the operculum between 
two strongly ctenoid scales and terminating below the soft dorsal. Ventrals with 
axillary scales. 
Dorsal originating behind the vertical of the origin of the ventrals and 
terminating behind the anal. Spinous dorsal higher than soft portion. Anal spines 
strong, soft portion of the fin similar to that of dorsal but with a longer base. Pectoral 
shorter than head, rounded, the upper rays longest. Ventrals pointed, reaching 
the first anal spine when adpressed. Caudal lobes probably bluntly rounded, but 
the tail of the type is damaged. 
The type of Pomacentrus onyx De Vis is a faded formalin specimen and no 
colour markings can now be traced. De Vis described the colouration as follows : — 
£ * Four black bands, first over the eye to the chin and chest. Second from anterior 
half of spinous dorsal to ventral. Third from posterior half of soft dorsal to anal. 
Fourth forming a large ovate patch covering the end of the caudal. Ventrals black.' ” 
