336 

 i. Macrones Dumeril. 



(C. DuMfcRiL, Ichthyologie analyt. 1856, p. 484). 



(Hypselobagrtis, Hemibagrus, Aspidobagrus Bleeker). 



Elongate. Head more or less depressed, smooth or rugose 

 above, covered by thin skin, with a median fontanel. Occipital 

 process reaching or not reaching to basal bone of dorsal spine. 

 Snout prominent, mouth arcuate, lips thin. Eyes with a free 

 orbital margin. 8 barbels of different length. A short dorsal 

 with a pungent spine, its hindborder more or less serrated 

 behind. Adipose fin much longer or shorter than anal, which 

 has less than 20 rays and is opposed to it. Pectorals with a 

 pungent spine, denticulated behind. Origin of ventrals below 

 or behind end of dorsal. Caudal deeply forked. Teeth in bands 

 in the jaws, in a curved band on the palate. Gillmembranes 

 nearly totally separated, free from isthmus. Branchiostegals 



8-13. 



Fig. 145. Macrones nigriceps (C. V.). X 3 /5' 



Synopsis of the species. 



I. Adipose fin much longer than anal. 



a. Median fontanel extending to base of occipital 

 process. 



ct. Adipose fin contiguous with dorsal M. nigriceps p. 337. 



/3. Adipose fin commencing at a distance from 



dorsal M. baramensis p. 338. 



b. End of median fontanel far distant from base 



of occipital process M. micracanthus p. 339. 



II. Adipose fin about equal to anal. 

 a. Upper surface of head rugose. 



