341 
Habitat: Borneo (rivers Mahakam, Barito, Kapuas, Sara- 
wak); Sumatra (Palembang!, Rokan river!, Djambi!). — Ma- 
lacea, Siam: 
In rivers. 
5. Macrones nemurus (C. V.). 
Bagrus nemurus Cuvier & Valenciennes, Hist. Nat. Poissons, XIV. 1839, p. 423. 
Bagrus Hoevenii Bleeker, Nat. & Geneesk. Arch, Ned. Ind. III (2). 1846, p. 154. 
Bagrus Sieboldii Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 1846, p, 155. 
Bagrus nemurus Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 150. 
Bagrus Hoevenii Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 153. 
Hemibagrus nemurus Bleeker, Atl. Ichth. Il. 1862, p. 55. 
Hemibagrus Hoevenii Bleeker, Atl. Ichth. II. 1862, p. 56. 
Macrones nemurus Giinther, Cat. Brit. Mus. V. 1864. p. 80. 
Macrones nemurus Vinciguerra, Ann. Mus, Civ. Genova, XVI. 1880, p. 169. 
Macrones Hoevenii Vinciguerra, Ann. Mus. Civ. Genova, XVI. 1880, p. 170. 
Macrones bleekert Volz, Zool. Anz. XXVI. 1903, p. 556. — Zool. Jahrb. Abt. 
Syst. XIX. 1903, p. 387. 
Hemibagrus nemurus Fowler, Proc. Acad. Nat. Sci. Philad. (2) LVII. 1905, p. 469. 
Macrones howong Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 181. — o.c. 
XXVII. 1906, p. 32. 
Macrones bongan Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 182. — o.c. 
XXVII. 1906, p. 35. 
Macrones bo Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 183. — o. c. XVII. 
1906, p. 38. ; 
Macrones kajan Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 184. — o.c. 
XXVII. 1906, p. 41. 
Macrones fortis Popta, Notes Leyden Mus. XXIV. Jan. 1904, p. 185. — o.€c. 
XXVII. 1906, p. 44. 
Macrones fortis var. capitulum Popta, Notes Leyden Mus. XXIV. Jan. 1904, 
p. 186. — o.c. XXVII. 1906, p. 48. 
B. tt—12; DD. i..7; Ao12—13; P: 1. 8—9;. V. 6. 
Oblong, dorsal profile elevated before dorsal; head flattened, 
snout spatulate, prominent. Mouthopening crescentic, subter- 
minal. Height about 5, head 3—3'/,, broader than high, its 
greatest width about equal to its length without snout. Eye 
6—8'/,, 2 to nearly 3 in snout, which is equal to about '/, 
of the head. Shields of the head striated, rugose, with a median 
groove ending before the slender occipital process, which is 
triangular and longer than broad at its striated base. Nasal barbels 
reaching the eye, maxillary barbels extending to anal or not so 
far, mandibulary barbels reaching base of pectorals, mental ones 
conspicuously shorter. Dorsal with the second ray the longest, 
slightly shorter than head, the osseous part of its spine nearly 
equal to postorbital part of head, its base longer than that 
Fe 
