18 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 79 



series, 7 rows above lateral line, 5,5 rows below lateral line, o rows 

 between lateral line and base of ventrals, 22 scales before dorsal, li 

 scales around narrowest part of caudal peduncle; scales of back and 

 upper side conspicuously ridged and with fluted edge. 



Fins: Dorsal rays ii,8, longest 1.75 times in head; margin of tin 

 convex, its origin over eighteenth scale of lateral line, midway be- 

 tween base of caudal and posterior edge of eye, first branched ray 

 in advance of origin of anal, base of last ray over middle of anal; 

 caudal longer than head, deeply forked, lobes pointed; anal rays 

 iii,ll, longest less than first dorsal rays, margin of fin slightly con- 

 vex; ventrals inserted under eleventh scale of lateral line, shorter 

 than pectorals; pectorals reaching to base of ventrals, the first rays 

 longer than those of dorsal. 



Life colors: Back pale sap green, sides and belly bright silvery, 

 bell}^ between pectorals and ventrals orange; side marked by 10 

 blackish vertically elongate spots, the first at the nape, the spots 





FlGURB S. — BaRILIUS PrLCHELLUS 



becoming roundish on the caudal peduncle; top of head like back, 

 side of head bright silver}^; top of snout, muzzle, and margin of 

 upper lip black ; iris yellow ; dorsal fin orange, with outer two-thirds 

 of membranes jet black; caudal pale green, with dusky edges; anal, 

 ventrals, and pectorals bright orange. 



Type. — A specimen 7.0 cm. long over all taken on December J, 

 1928, in the Mekang at Pang Chao, Northern Siam. Cat. No. 90299, 

 U.S.N.M. 



Remarks. — This species is as yet known only from 4 specimens 

 taken with a cast net in the Mekang, a beautiful clear, cool, mountain 

 stream on Doi Angka, Northern Siam. The 3 cotypes are similar 

 to the type but show slight variation in the shape and position of 

 lateral spots. The fish is known to the local people, who call it 

 pla nam muk (ink fish) and say that it reaches no larger size than 

 these specimens exhibit; one of them contained well-developed ova. 



