274 SCOMBKESOCID^. 



caudal), the length of the lower jaw (beyond the extremity of the 

 intermaxillaries) rather more than one-third. The triangular part 

 of the upper jaw, formed by the intermaxillaries, is a little broader 

 than long. The diameter of the eye is two-thirds of the width of 

 the interorbital space, and contained once and two-thirds in the 

 length of the postorbital portion of the head. Tlie root of the ventral 

 fin is much nearer to the base of the caudal than to the axil of the 

 pectoral. Base of the dorsal longer than the head (without snout). 

 Caudal rounded. Upper half of the dorsal black. 



Fresh waters and coasts of the East-Indian archipelago. 



a. Adult female. From Dr. Bleeker's Collection. 



33. Hemirhamphus dispar. 



Ilemirliamplius dispar, Citr. Sf VuL xix. p. 58, pi. 558 ; Bleeh. Nat. 



Tijdschr. Ned. Ind. vi. p. 498. 

 Zenarcliopterus dispar, Bleeh. Nederl. Tydschr. Dierk. iii. p. 164. 



D. 11. A. 11 (5-1- 1. + 1. + 4). P. 8. y. 6. 



The length of the entire head is contained twice and an eighth in 

 the total (without caudal), the length of the lower jaw (beyond the 

 extremity of the upper jaw) thrice and a half. The triang-ular part 

 of the upper jaw, formed by the intermaxillaries, is as broad as long. 

 The diameter of the eye is somewhat less than the width of the 

 interorbital space, and contained once and two-thirds in the length 

 of the postorbital part of the head. The root of the ventral fin is 

 much nearer to the base of the caudal than to the axil of the pectoral. 

 Dorsal and anal fins scaleless ; the former much longer than the latter, 

 and as long as the head (without snout). Caudal fin obtusely rounded. 

 Sides with a well-defined silvery band half as broad as a scale ; 

 dorsal fin uniformly coloured. 



East Indies. 



a. Adult female. Point de Galle. Presented by Sir A. Smith. 



b. Adult male, with dorsal and anal rays prolonged and thickened. 



From Dr. Bleeker's Collection. 



34. Hemirhamphus brevirostris. 



Hemirhamphus dispar, Xwe/-, Sitzgshcr. Akad. Wiss. Wien, I860, xxxix. 

 p. 537, fig. 3. 



D. 10-11. A. 13. P. 9. 

 Scales large. The length of the head is two-fifths of the total 

 (without caudal), that of the prominent part of the lower jaw one- 

 fifth. Upper jaw as broad as long. The diameter of the eye is one- 

 half of the length of the postorbital part of the head. Ventral con- 

 siderably nearer to the root of the caudal than to that of the pectoral. 

 The male has the fourth ray of the dorsal fin and the sixth of the 

 anal prolonged and thickened; the latter, besides, being provided 

 with additional filamentous rays. Caudal rounded. Sides with a 

 silvery band. 



East-Indian archipelago. 



