FRESH-WATER FISHES OF SIAM, OR THAILAND 311 



median incision; upper jaw with median beaklike projection fitting 

 into a depression in lower jaw ; lateral line complete ; scales deficient. 



Fins : Origin of dorsal fin midway between nostrils and base of me- 

 dian caudal rays, over origin of ventrals; dorsal rays ii,8, longest 

 branched ray 0.6 length of head ; caudal fin as long as head, moderately 

 emarginate ; anal rays ii,5, longest 0.6 head ; ventral rays i,7, extending 

 to anal opening, 0.7 length of head; pectoral rays i,10, 0.9 length of 

 head, extending 0.6 distance to ventrals. 



Coloration : Body dull yellowish brown, with 10 dark brown cross 

 bands wider than interspaces, 4 predorsal, 2 subdorsal, 4 postdorsal, 

 in addition to a narrow black cross band at base of caudal rays ; head 

 entirely dark brown to blackish, with exception of a diffused light 

 brown area on cheek, a light edge to the opercular flap, and light yellow 

 or whitish lips and barbels; all fins whitish or yellowish, dorsal and 

 caudal rays pale tan, a small black spot at base of first two dorsal rays, 

 and a dull brownish spot at base of ventral and pectoral fins. 



Figure 65. — Noemacheilus menanensis , new species: Type (U.S.N.M. No. 117753). 

 Drawn by Mrs. Alice C. Mullen. 



Type and paratypes. — The type (U.S.N.M. No. 117753), a specimen 

 5.5 cm. long, was collected by H. G. Deignan on April 20, 1936, in the 

 Menam Kon, a tributary of the Menam Nan, Northern Thailand. Ma- 

 terial that may be considered paratypic (U.S.N.M. No. 117752), col- 

 lected at the same place and tune, consists of 32 specimens 2.3 to 5 

 cm. long. 



Other specimens. — A single specimen 6 cm. long was collected in 

 the Huey Lorn, an affluent of the Menam Nan, in June 1936. 



Remarks. — Distinguishing features of this species are the long, 

 pointed head, short barbels, absence of scales except on back behind 

 dorsal fin, and blackish or dark brown color of the head, this color be- 

 ing in sharpest contrast on the lower surface. The cross bands in the 

 larger specimens are most distinct under and posterior to the dorsal 

 fin, and may be scarcely discernible anteriorly. The usual or average 

 number of cross bands seems to be about 10. In some of the smaller 



