15G 



BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



mouth closed on level with middle of pupil, postsj^mphyseal knob and 

 corresponding emargination moderately developed; 4 barbels, the 

 rostral 0.75 eye, the maxillary 0.25 as long as rostral ; gill rakers 1 + 7, 

 short, widely spaced ; pharyngeal teeth 5, 4, 2, long, slender, uncinate. 

 Squamation : Tube-bearing scales in lateral line 33, scales between 

 lateral line and origin of dorsal fin 6.5, scales between lateral line and 

 origin of ventral fin 2.5 or 3 ; predorsal scales 18, scales surrounding 

 narrowest part of caudal peduncle 14; all scales with numerous con- 

 spicuous horizontal striae. 



Figure 23. — Barilius nanensis, new species: T3'pe (U. S. N. M. No. 107940). Drawn by 



Mrs. Aime M. Awl. 



Fins : Origin of dorsal fin midway between tip of snout and posterior 

 end of central caudal rays, over fourteenth scale of lateral line; free 

 edge of fin truncate ; dorsal says iii, 7, longest branched ray 1,4 times in 

 head; caudal forked for about half its length, lower lobe longer and 

 about equal to head; anal fin beginning under fourth branched dorsal 

 ray, its edge slightly emarginate, anal rays iii, 10, longest branched 

 ray somewhat more than 0.5 head; ventral fin 1.5 in head, the rays i,7; 

 pectoral fin 1.2 in head, the rays i, 9, 



Coloration: Generally silvery; nine black spots along side between 

 head and base of caudal, the first two most distinct and persistent and 

 having the form of short, narrow, vertical stripes, others more or 

 less rounded; dorsal membranes hyaline, the rays below a horizontal 

 line from middle of first ray to tip of last ray blackish green ; caudal 

 green, rays narrov»'ly margined with black; other fins plain. 



Type and paratypes. — The type (U.S.N.M. No. 107940) is a mature 

 female, 7.2 cm. long, taken by H. G. Deignan on March 31, 1936, in 

 the Nan E.iver at Ban Pa Khwang, Northern Thailand. Four other 

 specimens (paratypes, U.S.N.M. Nos. 107939, 119474-119476) from 6.2 

 to 7.1 cm. long were taken in the same place as the type. All are 

 females with eggs well developed. 



