169 

 /. Zenarchopterus dux Scale. 



Zenarchopterus dux Scale, Philippine Journ. Sci. V, No. 4, 1910, p. 267. 



"Head, from tip of upper jaw, 4 to end of caudal vertebra; 

 lower jaw, beyond the upper, 3 to end of vertebra; posterior 

 margin of opercle midway between tip of lower jaw and end 

 of caudal vertebra; dorsal 12 ; anal 14; the 6th ray modified 

 into an intrornittent organ; scales in lateral series 41, about 

 45 in lateral line, 6 in vertical series; eye 3.75 in head; snout 

 3.1 ; width of exposed upper jaw equal to its length; origin 

 of anal midway between end of caudal vertebra and origin 

 of ventrals, being below fifth dorsal ray; length of ventrals 

 2.50 in head; length of pectorals 2.50 in head ; caudal truncate, 

 its length equal to distance from posterior end of upper jaw 

 to end of opercle; body covered with smooth deciduous scales. 



Color yellowish with a silver stripe along side which is 

 bordered above with dark green. A dusky wash on dorsal and 

 caudal, the anal with a distinct dusky blotch anteriorly. Length 

 150 mm." [After Seale, not seen by us]. 



Habitat: Borneo (Sandakan). 



8. Zenarchopterus dispar (C.V.) [Fig. 58, p. 163]. 



Heinirhaiiiphiis dispar Cuvier & Valenciennes, Hist. nat. Poissons XIX. 1846, p. 58. 

 Hctniraviphus dispar Bleeker, Nat. Tijdschr. Ned. Indie VI. 1854, p. 498. 

 Zenarchopterus dispar Bleeker, Ned. Tijdschr. Dierk. III. 1866, p. 164. 

 Hemirhainphiis dispar Giinther, Cat. Brit. Mus. VI. 1866, p. 274. 

 Zenarchopterus dispar Bleeker, Atl. ichth. VI. 1866 — 1872, p. 63. 

 Hemirhamphus dispar Day, Fishes of India, 4°. 1878 — 1888, p. 517. 

 Zenarchopterus ^aw/V^wij Jordan & Seale, Bull. Bureau Fish. Wash. XXV. 1906, p. 208. 

 Zenarchopterus dispar Jordan & Seale, Bull. Bureau Fish. Wash. XXVI. 1 907, p. 9. 

 Zenarchopterus dispar Giinther, Fische der Stidsee, Heft VIII. 1909, p. 358. 

 Zenarchopterus dispar Kendall & Goldsborough, Mem. Mus. Comp. Zool. Harvard 

 Coll. XXVI. 1911, p. 252. 



D. 10 — I I ; A. I I — 12 ; P. 1.9; V. 1.5 ; L.l. + 40. 



Compressed, the breadth of the body going somewhat more 

 or less than 1.5 in its height. Height 9 — 12, 10 — 13.8 in length 

 with caudal. Head from tip of upper jaw to branchial opening 

 2.4 — 3 in trunk. Entire head 1.9 — 2.1, 2.2 — 2.3 in length with 

 caudal. Length of lower jaw beyond extremity of upper jaw 

 about 3 — 3.5 in length, 3.5 to about 4 in length with caudal. 

 Eye 1.5 — 1.7 in postorbital part of head and 1.2 — 1.6 in inter- 

 orbital space. Triangular part of upper jaw somewhat broader 

 than long, scaly above. Praeorbital more or less rounded. 



