FRESH-WATER FISHES OF SlAM, OR THAILAND 321 



depth of body; caudal longer than head, moderately incised, lobes 

 rounded; anal rays ii,5, longest branched ray less than longest dorsal 

 ray; pectoral fin shorter than head, longer than ventrals, its rays i,10. 



Coloration: Pale, creamy yellow background of head and body 

 largely covered with dark brown; on top of head brown areas nar- 

 rowly separated by ground color hav^e geometrical design suggestive 

 of cephalic plates of ophicephalid fishes; sides of head brown, the 

 color extending lowest on opercles ; nasal flap colorless ; outer rostral 

 barbels brown dorsally, other barbels pale; body from head to base 

 of caudal fin with about 14 vertical brown bands, which meet over 

 the back but do not extend on ventral surface, the bands two or three 

 times as wide as the interspaces; six of the bands preclorsal, three 

 subdorsal, 5 postdorsal ; a narrow black stripe on the first cross band 

 extending on base of pectoral fin ; dorsal fin with a black spot at its 

 base anteriorly and with several irregular transverse rows of black- 

 brown spots on the rays ; caudal fin with its rays marked by numerous 

 black-brown spots having a tendency to form irregular wavy cross 

 lines, base of fin with a conspicuous black transverse band ; other fins 

 plain. 



Type and paratypes. — The type (U.S.N.M. No. 107946) is 5.3 cm. 

 long and was collected by H. G. Deignan in a mountain brook on Kao 

 Sabap, near Chantabun, Southeastern Thailand, April 29, 1937. From 

 the same brook and ou the same date 14 other specimens were 

 taken, 2.9 to 4.G cm. long (paratypes U.S.N.M. No. 107943). These 

 agree with the type except for slight differences in pattern of colora- 

 tion owing to age and individual variation. In general the cross bands 

 are separated by slightly wider interspaces, and on the back the dark 

 bands are constricted, leaving wider pale spaces. 



Remarks. — The outstanding features of this species are the moder- 

 ately elongate form, long barbels, long nasal tentacle, complete lateral 

 line, origin of the dorsal fin considerably nearer to base of caudal than 

 to tip of snout, numerous dark cross bands closer together than in 

 any other species of the region, definite and peculiar pattern of mark- 

 ings on top of head, and the black postcephalic band, which extends 

 on the base of the pectoral fin. 



The species is named for H. G. Deignan, ornithologist, in apprecia- 

 tion of his zeal in collecting fishes in remoter parts of Thailand for 

 the U. S. National Museum. 



NOEMACHEILUS KOHCHANGENSIS H. M. Smith 

 FiGUUE 71 



Noiiacheilus kohcharujensis Smith, 1933a, p. 56, fig. 2, pi. 1, fig. 2 (Koh Chang). — 

 KouMANS, 1937a, p. 64 (Northern Siam). 



A mountain stream on Koh Chang, in the Gulf of Siam, yielded the 

 type specimen of this rather strongly marked species. 



