254 Records of the Indian Museum. [Vol, VIII, 



Macrones montanus (Jerdon) var. dibrugarensis, nov. 



(PI. ix, figs. 2, 2a, 2b.) 



The depth of the body is contained four and one-eighth times 

 in the total length, the length of the head three and three-quarter 

 times. The eye is slightly in front of the middle of the head ; its 

 diameter is contained four and a quarter times in the length of 

 the head, one and a half times in the length of the snout and 

 one and three-quarter times in the interorbital length. The upper 

 jaw is slightly protruding, villiform teeth are present on both jaws. 

 The nasal barbel is longer than half the length of the head and 

 reaches the post-orbital region; the maxillary barbels reach the 

 middle of the caudal peduncle and are thrice as long as the length 

 of the head ; the outer mandibular reaches the end of the pectoral 

 and the inner mandibular reaches the root of the pectoral ; the 

 inner mandibular is two-thirds the length of the outer mandibular. 

 Dorsal I 7. The last rays are just over the vertical of the ventral 

 fin, the distance of the anterior base of the dorsal from the snout is 

 three-fourths of the distance of the posterior root from the caudal ; 

 its spine is perfectly smooth on both sides, and is nearly half the 

 length of the head. The pectoral spine is one and a half times as 

 long as the dorsal spine ; it is strongly denticulated on the inner 

 and feebly serrated on the outer side. The margin of the anal 

 opening is lobulated; it is situated quite close to the root of the ven- 

 tral. The end of the ventral if laid along the body reaches down to 

 the anal papilla close to the anterior base of the anal fin. The 

 distance of the anal opening from the root of the caudal is two- 

 thirds of its distance from the snout ; the distance of the anal papilla 

 from the root of the caudal is just half its distance from the snout ; 

 the distance of the anal opening from the anterior base of the anal 

 is three times its distance from the root of the ventral ; the dis- 

 tance of the anal papilla from the root of the ventral is three times 

 its distance from the anterior root of the anal. The anterior end 

 of the adipose fin is a little in front of the vertical from the 

 anterior base of the anal, and ends in a raised lobe above the 

 posterior base of the anal fin. The length of the base of the fin 

 is contained five and one-eighth times in the total length. The 

 caudal is deeply forked; the lobes are equal and widely apart, the 

 length of the lobe being three times the length of the undivided base. 



Colour — Head gre}^, dorsal side dark brown, body brownish. 

 The membranous covering of the air-bladder behind the gill 

 opening is black, and a black line from above this membrane 

 extends through the middle of the side to the middle of the root 

 of the caudal fin, ending in a black circular blotch. The barbels 

 are black, except the inner mandibular, which, with the fins, is 

 dull white. 



Dibrugarh. Type specimen numbered F. ^-y^ in the Museum 

 register; total length with caudal 68 mm. 



