30. Arius brevirostris Steind. 



Arius brevirostris Steindachner, Abh. Senckenb. Naturf. Gesellsch. XXV. 1901, 

 p. 447. 



D. I. 7; P. I. 9; A. 2O. 



The dorsal profile of head ascends in a convex line from 

 anterior end of head regularly to dorsal. Snout and front 

 transversely slightly convex, occipital part more strongly so, 

 mesially carinated on occiput and granulated as the front. 

 Cleft of mouth transverse, slightly curved, broad. Upperborder 

 of mouth scarcely prominent above the lower. Nostrils large, 

 those of one side separated by a cutaneous fold. Occipital 

 process with its base slightly broader than it is long, exten- 

 ding to the narrow, semilunar basal bone of dorsal spine, 

 where it is truncated with a slight curve. Head about 3 3 / 5 . 

 Eye 5, snout somewhat more than 3^3, breadth of cleft of 

 mouth more than i 2 / 3 , height below origin of dorsal iV 2 , at 

 caudal peduncle 3, length of pectorals as also that of caudal 

 and height of dorsal I in head. The band of teeth on the 

 palate narrow, curved, mesially separated by a small inter- 

 space. Each of the two halves has one constriction. The teeth 

 are very small, granular, whereas those in the jaws are fine 

 and villiform. Length of maxillary barbels about 2 ! / a times in 

 length of body. Outer mandibulary barbels slightly more than 

 once in length of head. The maxillary barbels extend with their 

 point nearly to posterior end of pectorals. The spine of dorsal 

 and pectoral is strong, flexible towards its end, and only weakly 

 and sparingly denticulated at its posterior border. Length of base 

 of anal somewhat more than i 1 ^, that of the dorsal about 2'/2> 

 that of the adipose fin about 2 3 / 5 in length of head. Adipose 

 fin orginates at some distance behind vertical through origin 

 of anal and ends shortly before end of anal. Ventrals half as long 

 as head and reaching with their point to begin of anal. Caudal 

 deeply crescentic, the median rays about half as long as the 

 longest of the slender lobes. Sides of head and trunk above 

 plumbaceous, below silvery. Upper side of head with yellowish 

 green metallic hue. Barbels, rays of pectorals (with exception 

 of their spine) and anal, lower half of anal and margin of 

 caudal, dark greyish violet. Length of the single specimen 

 73 mm. [Translated from Steindachner, not seen by us], 



Habitat: Borneo (Baram river). 



