31. MACRONES. 77 



extend to the opercles, those of the maxillaries to the tail or to the 

 caudal fin. The dorsal fin is as high as the body ; its spine is slender, 

 half as long as the head, and serrated posteriorly ; the adipose fin is 

 twice as long as, and commences at some distance from, the dorsal. 

 Pectorals not much shorter than the head, with* a very strong spine, 

 which is serrated interiorly, and much longer than that of the dorsal 

 fin ; ventrals shorter than pectorals. 

 Java, Sumatra, Borneo. 



a. One of the typical specimens. From Dr. P. v. Bleeker's Collection. 



4. Macrones elongatus. 

 D. 1/7. A. 14. P. 1/10. 



The height of the body is one-sixth of the total length (without 

 caudal), the length of the head one-fourth ; the greatest width of the 

 head is contained once and a third in its length, its depth once and 

 three-fourths ; snout flat, depressed, its length being rather more 

 than one- third of that of the head ; head not granulated above ; 

 occipital process very short ; the teeth on the palate form a subsemi- 

 circular band. The nasal, barbels extend to the eye, those of the 

 maxillaries to the ventrals, the outer mandibulary barbels to the 

 pectoral. The dorsal fin is as high as the body, not pointed above ; 

 its spine is of moderate strength, more than half as long as the head, 

 smooth anteriorly and finely serrated posteriorly ; the adipose fin 

 commences at a short distance from, and is thrice as long as, the 

 dorsal ; it is lower than the hind part of the tail. Caudal fin forked. 

 Pectoral spine (broken) stronger than the dorsal spine, strongly ser- 

 rated interiorly and finely granulated exteriorly ; the soft pectoral 

 as long as the head without snout. Ventral fin shorter than pec- 

 toral, not extending on to the vent. Dorsal and caudal fins with a 

 black margin. 



Singapore. 



a. Eleven inches long. Prom the Haslar Collection. 



5. Macrones nigriceps. 



Bagrus nigriceps, Cuv. fy Val. xiv. p. 412. 



singaringan, Bleek. Verb. Bat. Gen. xxi., Silur. Batav, p. 22. 



heterarus, Bleek. 1. c. p. 23. 



macronema, Bleek. 1. c. p. 22, and Prodr. Silur. p. 157. 



Ilypselobagrus macronema, Bleek. Atl. Ichth. Silur. p. 58. tab. 73. 



D. 1/7. A. 11. P. 1/9-11. 



Closely allied to M. cavasius. The height of the body is nearly 

 equal to the length of the head, and one-fifth, or rather more than 

 one-fifth, of the total ; head as broad as high, its greatest width being 

 contained once and two-fifths or once and a third in its length. 

 The nape and the occipital process are granulated, the latter extend- 

 ing on to the basal bone of the dorsal spine. Vomerine teeth in an 

 uninterrupted crescent-shaped band. The maxillary barbels extend 

 to the tail or to the caudal fin. The upper jaw is the longer. The 



