15^ 



D. ^.11 — 12; A. 2.9 — lO; P. 1. 10— II; V.I. 5; L.l. 53 — 56. 



Strongly compressed, the breadth of the body being one 

 half of its height. Height 8.1 — 8.7, 9.5 — 9.8 in length with 

 caudal. Head from tip of upper jaw to branchial opening 

 2.8 — 3.2 in trunk. Entire head 2.2 — 2.4, 2.7 — 2.8 in length 

 with caudal. Length of lower jaw beyond extremity of upper 

 jaw 4 — 4.4, 4.5 to more than 5 in length with caudal. Eye 

 1.4 — 1.7 in postorbital part of head and equal to or even a 

 little more than interorbital space. The triangular part of the 

 upper jaw, formed by the intermaxillaries, is broader than 

 long. Teeth stout, in the upper jaw in 2 series, in the lower 

 jaw in about 4 series; the bands of teeth do not taper con- 

 spicuously anteriorly or posteriorly. Origin of anal about oppo- 

 site to 5th dorsal ray. Origin of dorsal separated by 32 — '>^'j 

 scales from occiput and by 6 scales from lateral line. Dorsal 

 and anal concave, the anterior rays the longer except in young 

 specimens (see below). Length of base of anal 1.5 — 1.7 in that 

 of dorsal. Pectorals longer than head without snout. Ventrals 

 about half as long as pectorals, their inner ray produced and 

 longer than the penultimate one. Origin of ventrals twice 

 nearer to base of caudal than to tip of upper jaw. Caudal 

 forked. Colour of preserved specimens brownish, more or less 

 silvery, darker above. A lateral silvery band, bordered above 

 by a more or less distinct narrower blackish band. Pectorals, 

 ventrals and anal hyaline, the last two sometimes tipped with 

 black. Dorsal black in front and along its free border. Caudal 

 bordered with black above, below and posteriorly. (For colours 

 of young specimens see below). Length more than 300 mm. 



Nom. indig. : Djulong-djulong (Malay Batavia), Ongwaru 

 (Ternate). 



Habitat: Singapore; Pulu Weh ! ; Java (Batavia!, Bantam, 

 Cheribon!, Semarang!, Pekalongan !, Surabaya!, Panarukan!); 

 Duizend-Islands; Java Sea!; Celebes (Makassar, Lagusi, Menado); 

 Sangir Islands!; Ternate; Batjan; Obi; Ambon; Flores!, 

 Taam !. — Red Sea, British India, Phihppines, China, Palm 

 Islands, New Caledonia. 



In sea and estuaries. 



Note. We have united H. fasciatus Blkr. with H. margi- 

 natiis Forsk. Bleeker described this species after one specimen 

 of 64 mm. One of us described afterwards other specimens 



