FRESH- WATER FISHES OF Si AM, OR THAILAND 313 



maxillary barbel, which is equal to outer rostral barbel and reaches 

 vertical from posterior margin of eye; opercles with a broad mem- 

 branous flap. 



Squamation: Lateral line complete; minute scales covering body 

 posteriorly, deficient anteriorlj^ and on abdomen. 



Fins : Origin of dorsal fin a trifle nearer to tip of snout than to base 

 of caudal and distinctly in advance of ventrals ; dorsal rays ii, 9, longest 

 ray about 1.4 in head and less than depth of body ; caudal fin slightly 

 longer than head, moderately forked, lobes rounded; anal rays ii, 5, 

 longest about 1.5 in head ; ventral rays i, 7, reaching ventral opening, 

 slightly shorter than pectoral, which has rays i, 12, extending halfway 

 to ventrals, and slightly shorter than head. 



Coloration : Reddish brown, lighter below ; body marked by rather 

 indistinct dark vertical bands about width of interspaces, four pre- 

 dorsal, three subdorsal, and three postdorsal, together with a curved 

 black band at base of caudal fin ; head, with exception of lips and a 

 diffuse light brown area on cheeks, uniform dull black; lips, barbels, 

 and edge of membranous opercular flap whitish ; dorsal fin blackish at 

 base, rays dusky green; caudal, and lower fins greenish; a small dull 

 brownish area at the base of ventral and pectoral fins. 



Tyjpe and paratypes. — The type (U.S.N.M. No. 117750) 6.7 cm. long 

 was collected by H. G. Deignan April 21, 1936, in the Menam Kon, a 

 branch of the Menam Nan, at Ban Khana, Northern Thailand. Para- 

 types, U.S.N.M. No. 117746, taken April 20, 1936, in the same locality, 

 number 70 and range in length from 2.4 to 6.1 cm. 



ReTTiarks. — The watercourse from which the type specimen came 

 was noted by Mr. Deignan as a small, clear, swift riiountain stream. 



The characters by which the species may be recognized are the 

 small, blunt head, steep rostral profile, short barbels, deep caudal 

 peduncle, small fins, and striking coloration of the head. In the 

 peculiar dorsal profile of the head there is resemblance to the Indian 

 species N. rupicola Vaillant and N. inontanus (McClelland) from the 

 Himalayas. 



NOEMACUEILUS REIDI, new species 

 FiGUEE 67 



Description. — Form rather elongate ; body compressed, its greatest 

 depth 6 times in standard length ; length of caudal peduncle equal to 

 its depth and 1.8 times in length of head; 4 in length, head moder- 

 ately depressed, its depth 0.75 its width, its width 1.5 in its length; 

 eye in midlength of head, 5 in head, 1.7 in interorbital space, and about 

 2 in snout which is about 2.5 in head ; mouth semicircular, lips moder- 

 ately thick, lower lip medianly incised, upper jaw with a broad me- 



