74 ARIUS BLEEKERI. 



But Arius Bleekeri is distinguished from A. mac7'onota- 

 canthus Blkr. while the body is less high; the head is 

 smaller; the upper jaw is the longest; the median groove 

 is posteriorly shorter and not similar; the barbels are 

 longer; the teeth on the palate are villiform and not ob- 

 tusely conical or granular; the shape of the patches is 

 oval and not pearshaped ; the lateral line is not so rarai- 

 ficated and is not bifurcated at the base of the caudal, 

 but is directed upwards; the dorsal spine and the pectoral 

 spine are less strong and not reticulated at the sides; 

 the adipose fin is more slender and has no black spot ; 

 the ventral fins reach the anal fin ; the anal fin has more 

 rays ; the caudal fin is longer and the lobes are more 

 pointed. 



The relation of it with Arius coelatus Val. is as follows : 

 the height of the head is about the same; the upper sur- 

 face of the head and the occipital process is in both 

 much granulated; the upper jaw is also the longest; they 

 have both two patches of villiform teeth on the palate 

 and these are at the same place; their adipose fin is of 

 average size, much shorter than the anal. 



They differ in the following respects: the body of 

 A. Bleekeri is a little less high; the median groove is 

 posteriorly shorter and not similar ; the barbels are a 

 little longer ; the patches of teeth are oval and not sub- 

 triangular; the lateral line is not bifurcated at the base 

 of the caudal, but directed upwards; the dorsal spine and 

 the pectoral spine are less strong and not cellular at 

 the sides; the caudal fin is longer, the lobes are pointed 

 and not I'ounded ; the adipose 6n has no black spot. 



Z>3'otes Iroiii llie Leyflen IMuseuiii, Vol. XXH. 



