59. ARius. 165 



47. Alius macrocephalus. 



Arius macrocephalus, Bhek. J'erh. Hat. Gen. xxi. <SV/i//-. Batuv. p. 40. 

 .\iiod(>s macrocephalu.s, Blcek. Prodr. Si/ur. p. 85, and At/. Ichth. Silur. 

 p. .-'/J. tab. 68. 



B. 6. D. 1/7. A. 20. P. 1/11. 



The hoi^'ht of the body is one-fil\h or two-ninths of the total 

 length (without caudal), the length of the head one-third; head 

 broader than high, its greatest ^^'idth being three-fifths of its length. 

 The eyes are situated nearly entirely in the anterior half of the head. 

 Occipital process triangular, twice as long as broad ; basal bone of 

 the doi-sal spine small. The vomerine teeth form two minute patches, 

 but are deciduous with age ; the teeth on the palatine bones arc 

 granular, and form an ovate patch on each side, which is about as 

 large as the eye. The maxillary barbels extend to the opercles, 

 those of the mandible to the gill-opening. Dorsal fin nearl}* as 

 high as the body ; its spine is slender, scarcely serrated, two-thirds 

 or three-fifths of the length of the head. Adipose fin much shorter 

 than dorsal ; the pectoral spine is shorter, but scarcely stronger, 

 than that of the dorsal fin, and strongly serrated ; pectoral fins two- 

 thirds of the length of the head. Adipose fin with a black spot 

 superiorly. 



Java. 

 a. Type of the species. From Dr. P. v. Blcekcr's Collection. 



48. Arius liocephalus. 



Arius leiotetocephalus, Blvek. Verh. Bat. Gen. xxi. Silur. Bat. p. 48. 

 ? Ariodes meyenii, Miill. ^- Trosch. Hot: Ichth. iii. p. 9. 

 Ariodes leioceplialus, Bleek. Prodr. Silur. p. 88, and Atl. Ichth. Silur. 

 p. 40. tab. m. fig. 2. 



B. 6. D. 1/7. A. 15-16. P. y^. 



The height of the body is contained five times and a fourtli or 

 four times and two-thirds in the total length (without caudal), the 

 length of the head thiicc and a half or thrice and two-thii'ds ; head 

 broader than high, its greatest width being contained once and two- 

 fifths or once and one-third in its length. Head nearly smooth above, 

 but slightly granulated in old individuals. The occipital process is 

 ovate, Avith the lateral margins convex, Jiarrowed at its base.. The 

 teeth on the palate are granidar, in four patches : a small patch on 

 each side of the vomer, and an elongate and convex one along each 

 palatine bone ; the palatine patches divergent behind. The maxil- 

 lary barbels extend to the opercle. Dorsal fin about as high as the 

 body ; its spine is strong, nearly smooth behind, and two-thirds or 

 three-quarters of the length of the head. Pectorals shorter than the 

 head, with their spine as long as that of the dorsal fin. 



Java, Singapore, and Celebes. 



n. Adult. Purchased of Mr. Frank. 



Ariodes me'/enii, M. & T., appears to be founded on an did ex- 

 ample of this species. 



