FRESH-WATER FISHES OF SIAM, OR THAILAND 315 



Remarks. — This is a comparatively dull-colored form. The dark 

 cross bands do not stand out prominently as in many other species and 

 anteriorly show a tendency to become faint or almost disappear. There 

 is a slight variation in the number and shape of the cross bands, and 

 there may be a blackish blotch involving the base of the dorsal fin 

 posteriorly. 



There is a close resemblance between this species and N. cincticauda 

 (Blyth), of Lower Burma. In the latter form, as described in full 

 detail and figured by Hora (1929a), the barbels are subequal, the 

 rostral barbels respectively reach the anterior margin and the middle 

 of the eye, the maxillary barbel extends well behind the eye, and the 

 lateral line is incomplete, ending before the ventral fin. 



There is resemblance also between this species and N. sexcaudo., 

 (q. v.), known from a single specimen 11.6 cm. long from Mepoon. 

 Differences are apparent in the size and position of the eye (entirely 

 in anterior half of head in sexcauda) , width of head in relation to 

 its length (greater in sexcauda than in reidi), shape of the mouth 

 (less strongly curved in sexcauda and according to Fowler's figure 

 the lower lip lacks the median incision seen in reidi)^ and such 

 characters as the shape and direction of the predorsal and subdorsal 

 cross bands. 



The species is as yet known only from a mountain torrent at the 

 foot of Doi Mekong Kha, between Mesarieng and Ta Ta Fang, and 

 from the Salwin at Ta Ta Fang. 



It does not appear to fit in with any of the other species recorded 

 from Thailand, Burma, and India. Its principal features are the 

 slender body, short barbels, complete lateral line, posterior position 

 of the dorsal fin, long ventrals, and subdued coloration. 



A specimen, 7.5 cm. long, from the type locality shows a regular 

 transverse fold across the isthmus between the attachment of the 

 branchial membranes. In one specimen one of the inner rostral 

 barbels is bifid. 



The species is named for E. D. Reid, of the division of fishes in the 

 U. S. National Museum. 



NOEMACHEILUS SEXCAUDA Fowler 



Nemacneilus sexcauda Fowleb, 1937, p. 156, figs. 75, 76 (Mepoon). 



This species is known from one specimen, 11.6 cm. long, from Me- 

 poon, Central Thailand. The body is marked by 11 irregular dark 

 brown cross bands, of which 4 are predorsal, 2 subdorsal, and 5 post- 

 dorsal, with a narrow black band at base of caudal. The dorsal fin is 

 damaged. The maxillary is described as contained 3 times in length 

 of head, but the figure indicates 5 to 6 times. 



The species is compared by Fowler with Noemacheilus semi-dncta 

 (Blyth), probably cited in error for N. cincticauda (Blyth). .That 



