FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 769 



S850. River at Catbalogan, Samar market. April 15, 1908. Length, 141 mm. 

 18308 to 18310. River at M;ikassar, Celebes. December 29, 1906. Length, 218 

 to 227 mm. 



TACHYSURUS ARGYROPLEURON (Valenciennes) 



Arius argyroplcuron (Kuhl and Van Hasselt) Valenciennes, Hist. Nat. Poiss., 

 vol. 15, p. 104, 1840 (type locality: Java). — GtJNTHER, Cat. Fish. Brit. Mus., 

 vol. 5, p. 164, 1864 (types of Arius acutus). — Steindachnee, Sitz. Ber. Akad. 

 Wiss. Wien, math.-nat. KL, vol. 57, pt. 1, p. 1003, 1868 (no locality).— Seale, 

 Philippine Journ. Sci., vol. 5, p. 266, 1910 (Sandakan). — Webeb and Beau- 

 fort, Fishes Indo-Australian Archipelago, vol. 2, p. 278, fig. 108 (head 

 above), fig. 109 (npper teeth), 1913 (Bagau Api Api, Balikpapau). — Hae- 

 denbekg, Treubia, vol. 13, livr. 1, p. 116, 1931 (Bagan Si Api Api). 



Ariodes argyroplcuron Bleeker, Atlas Ichth. Ind. Neerland., vol. 2, p. 40, pi. 

 (11)59, 1862 (Java, Sumatra). 



Tachysurus argyroplenron Fowler, Proc. Acad. Nat. Sci. Philadelphia, 1905, p. 

 462 (Baram River, Borneo). — Suvatti, Index Fish. Siam, p. 61, 1937 (Lang 

 Suan; Songkhla; Canthaburi). — Fowler, List Fish. Malaya, p. 49(249), 

 1938 (reference). 



Arius acutus Bleeker, Nat. Geneesk. Arch. Nederl. -Indie, vol. 3, pt. 2, p. 167, 

 1846 (type locality: Batavia). 



Arius hamiltonis Bleeker, Nat. Goneesk. Arch. Nederl.-Indie, vol. 3, pt. 2, p. 291, 

 1846 (type locality: Batavia). 



Depth 43^ to 5; head 31/2, width I2/7. Snout 2% in head; eye 

 41/^ to 7, 2 in snout, 2% in interorbital ; maxillary barbels reach 

 pectorals or not quite so far, mandibulary barbels somewhat shorter, 

 mental barbels reach gill membrane ; villif orm teeth in arcuate band 

 in jaws; granular teeth far back on palate in 2 oval groups, long 

 axes converging hindward; 2 small patches on front of palate, 

 reduced to few small teeth or even wanting; interorbital 1% in 

 head. Gill rakers 7 or 8, short, stout. 



Head shields with roughened and granulated lines; occipital ex- 

 tension in young, longer than broad, lateral edges straight, twice 

 or more than twice longer than broad in its middle, touching basal 

 bone of dorsal, which with winglike extremities. Median fontanel 

 begins on snout and ends before occipital extension, broadest 

 medianly. 



D. I. 7, height over II/2 in head, rather weak spine long as head 

 without snout, at top and front border slightly denticulated and 

 along whole of hind border; adipose fin small, base much less than 

 that of soft dorsal or 4i^ in interspace; A. 19 or 20; pectoral I, 11, 

 long as head without snout, flattened spine somewhat shorter and 

 stronger than that of dorsal ; ventral 6, not reaching anal and much 

 shorter than pectoral. 



Brownish above, whitish below. Outer half of fins dusky. 

 Length, 460 mm. (Weber and Beaufort.) 



East Indies (Java, Sumatra, Borneo), 



