59. ARius. 167 



? Silurua ocellatus, Bl. Schn. p. 379. 



? Pimelodus arius, Ham. Buck. pp. 170, 376. 



Arius arius, Ciw. ^ Val. .\v. p. 102 ; Bleek. Silur. p. 72. 



gagorides, BUek. Verh. Bat. Gen. xxi. 8ihir. Bat. p. 42. 



chondropterygioides, Bleek. I. c. p. 44. 



angulatus, Bleek. I. c. 



heckelii, Bleek. I. c. 



bonieensis, Bleek. Nat. Tydschr. Nederl. Ind. ii. p. 67. 



Pseudarius arius, Bleek. Atl. Iclith. Silur. p. 36. tab. 49. 



D. 1/7. A. 20-22. P. 1/10. 



The height of the body is contained four times and two-fifths or 

 five times in the total length (^\^thout caudal), the length of the 

 head thrice and two-fifths or thrice and a quarter ; head rather 

 broader than high, its greatest width being two-thirds or three- 

 quarters of its length. Occipital process granu- 

 lated, subtriangular, scarcely longer than broad. 

 The band of intermaxillary teeth is six times as 

 long as broad ; teeth on the palate granular, in 

 two separate semiovate patches. The maxillaiy 

 barbels are considerably shorter than the head. 

 Dorsal fin higher than the body ; its spine is strong, 

 serrated along both edges, and it is contained once ' 

 and a fifth or once and two-thirds in the length of | 



the head. Adipose fin rather shorter than dorsal. \\ 



Pectoral two-thirds or five-sixths of the length of 

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

 Adipose fin with a large black spot. 



East Indies. 



a. Adult. From Dr. P. v. Bleeker's Collection. 



52. Arius pidada. 



Arius pidada, Bleek. Verh. Bat. Oen. xxi. Silur. Bat. p. 4."', aud Prodr. 

 Silur. p. 74. 



vivipai-us, Bleek. I. c. p. 45. 



Pseudarius pidada, Bkek. Atl. Icldh. Silur. p. 37. tab. 50. 



This species is very similar to Arius maculatus, but differs in 

 having a somewhat shorter head, the length of which is contained 

 tlirice and two-thirds or four times in the total (without caudal). 



Java and Sumatra. 

 n. Tyi^e of the species. From Dr. P. v. Bleeker's Collection. 



53. Alius macracanthus. 

 D. 1/7. A. 19. P. 1/10. 

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

 caudal), the length of the head two-sevenths. Head as broad as high, 

 its greatest Avidth being two-thirds of its length ; its upper surface 

 is granidated ; a lanceolate smooth groove divides the upper surface 

 of the head into two halves, and docs not quite extend backwards to 



