280 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



Squamation and dermal papillae: Each scale of back and sides 

 with a prominent longitudinal keel, the keels forming conspicuous 

 parallel ridges; keels lacking on under surface of body; no scales 

 on head, on breast, and on median ventral surface anterior to ventral 

 fins; lateral line running in a nearly straight line from upper angle 

 of gill opening to midbase of caudal fin; scales in lateral line 44, in 

 transverse line to base of ventrals 7-1-6, between lateral line and origin 

 of anal 5.5, in predorsal region 13, around narrowest part of caudal 

 peduncle 18. Upp-er side of head beset with elongate and rounded 

 tubercles, those on top of head mostly elongate and tending to be in 

 longitudinal lines, those on snout largest and rounded. 



Fins : Origin of dorsal fin one eye diameter in advance of ventrals 

 and nearer to tip of snout than to base of caudal; dorsal rays ii, 7, 

 first branched ray 1.25 in head; caudal fin longer than head, mode- 

 rately forked, lobes pointed, lower lobe longer; anal rays ii, 5, longest 

 1.3 in head; ventral fins shorter than head, not reaching anal but 

 extending far beyond ventral opening, ventral rays ii, 8 ; pectoral fins 

 about length of head, rays iv, 10, in axil of each pectoral a large, 

 Boft, spindle-shaped mass covered with minute papillae and attached 

 to the bases of all the rays. 



Coloration : Upper parts dark reddish brown ; back and sides with 

 indistinct dark brown areas as follows : a narrow cross band extending 

 from base of pectorals across nape, two large, round predorsal blotches 

 the posterior extending under anterior dorsal rays, a saddle-shaped 

 blotch on back and side below posterior part of dorsal fin, and three 

 obscure cross bands on back between dorsal and caudal fins ; abdomen 

 whitish ; dorsal fin with basal half of ray black, distal part brownish, 

 contrasting strongly with hyaline membranes, a whitish spot at base 

 of first ray and another at middle of second and third rays; caudal 

 fin mostly black, outer half of upper lobe rich brown ; edges of lobes 

 whitish ; anal rays blackish or dark brownish, membranes pale ; ven- 

 trals brown at base, membranes and distal part of rays pale ; pectorals 

 with rays and membranes brown basally, pale distally ; cephalic tuber- 

 cles white. 



Tyye.—K specimen (U. S. N. M. No. 107963) , 10.3 cm. long, collected 

 in a waterfall stream on Kao Chong, Trang Province, Peninsular 

 Thailand, September 2, 1933. 



Remarks. — Only the type is known. It is a female with abdomen 

 distended with minute eggs approaching ripeness. 



The name given to this fish by the local mountain people is pla 

 lin hin. 



This fish is named for Dr. Paul Bartsch, curator of mollusks and 

 Cenozoic invertebrates in the United States National Museum, in 

 appreciation of his extensive and important contributions to Oriental 

 zoology. 



