TCHTIITOLOQY. 251 



Snout spatuliito. To]) of head smooth. Dorsal spino very slender, only osseous 

 at its hase. U|)per caudal lohe with a tilamentous prolongation. Light brown, shot 

 ■with purple. Fins darkest externally. 



The IrrawadJy Kiver. 



M. CAVAsius, Hum. Buch. 



Nga-zyn-zeng. 



B. vi.; D. 10; P. \\ X. 6; A. 1M3; C. 16. 



Snout obtuse. The nasal barbels nearly as long as the head. The maxillary 

 extend to beyond the base of the caudal tin. The external mandibular to almost the 

 hase of the ventral, the internal as long as tlie head. Dorsal spine weak, entire. 

 Pectoral internally denticulated. Colour plumbeous above, yellowish on the belly 

 and cheeks. Dorsal and caudal dusky, the other tins dull white. Grows to li feet. 



Burma. 



M. vrriAins, Bloch. 



Nga-zyn-yaing. 



B. X.; D. i-0; P. ^ ; V. G ; A. 912; C. 17. 



Top of head roughened. The maxillary barbel reaches the ventral fin ; the 

 nasal, the opercle ; the outer mandibular, to the first third of the pectoral spine, 

 wliilst the inner is shorter. Dorsal spine liaK as long as the head, finely serrated 

 behind. Pectoral spine strong, with 16 coarse denticulations. Colour variable. 

 Silvery or golden. Aged specimens (in Madras) have a light bluish lateral band 

 with a paler one above and below. A dark slioulder spot, and another sometimes at 

 the base of the caudal fin. Sometimes the fish appears dark with 5 longitudinal 

 silvery bands. Tops of fins. dark. Grows to 8 inches. 



Burma. 



M. i.KUCOpnAsis, Blytli. 



Nga-pet-lck and Xga-nouk-thwa. 



B. xi.; D. ■-•0; P. — \-u ; V. 6; A. 1112; C. 17. 



Snout rounded. Top of head rather rugose. The nasal barbels just reach to the 

 middle of the eye ; the maxillary to the anal fin ; the outer mandibular to the middle 

 of the pectoral fin, and the inner to the gill openings. The dorsal s])ine finely serrated 

 behind in its upper foui'th. Purplish-black, with some white dots on the body. 

 Grows to a foot or more. 



Tenasserira. 



M. Bleekkri, Day. • 



B. x. ; D. iO; P. v-Vu! '^'- 6 ; A. 910 ; C. 17. 



Snout obtuse. Top of head, opercle, occipital bone and humeral process 

 granulated. The nasal barbels reach the hind edge of eye ; the maxillary ones, the 

 anal fin ; the outer mandibular, to the base of the pectoral ; the inner ones a little 

 less. Dorsal spine entire. Pectoral spine longer than dorsal and denticulated. 

 Brownish grey, with two light longitudinal banils below the lateral line. Sometimes 

 a dark slioulder spot, and a dark median band on the anal fin. 



Burma. 



Erethistes, Muller et TroscheJl. 



Head osseous superiorly, somewhat depressed, llouth small, terminal, or sub- 

 inferior. Eyes small, sub-cutaneous, witliout a free orbital margin. Nostrils close 

 together, separated by a barbel. Barbels 8, the maxillary ones with broad bases. 

 Villiform teeth in jaws, palate edentulous. 



E. iiARA, Ham. Buch. 



Nga-kyoiik-hpa. Burma. 



D. ,V0; P. J; V. 6; A. 1011 ; C. 1.5. 



