FRESH-WATSJR fishes of STAM, or THAILAND 



199 



Type. — The type and only known specimen (U.S.N.M. No. 117749), 

 10 cm. long, was collected by H. G. Deignan October 18, 1936, in Huey 

 Mekong Kha, a mountain brook tributary to the Salwin, at a point 

 between Mesarieng and Ta Ta Fang, Western Thailand. 



Remarks. — The combination of large scales with a black longitudinal 

 band on the side of the body, serves to distinguish this species from 

 other local forms and from other described species. From A. suma- 

 tranus, a species with similar squamation, the differences are in having 

 one less branched dorsal ray and in coloration; from A. deauratus, the 

 species with similar dorsal rays, the differences comprise fewer scales 

 and peculiar coloration. The relations with the other local species 

 are brought out in the key. 



ACROSSOCHEILUS MALCOLMI, new species 

 FiGUBE 34 



Description. — Moderately elongate, rather strongly compressed; 

 profile from snout to dorsal fin strongly arched ; depth 2.75 in stand- 

 ard length ; least depth of caudal peduncle 1.5 in its length and about 

 0.5 length of head; head 3.6 in standard length; snout 3.4 in head 



Figure 34. — Acrossocheilus malcolvii, new species: Type (U.S.N.M. No. 117748). 



by Mrs. Alice C. Mullen. 



Drawn 



and 1.25 in the moderately convex interorbital space; eye equal to 

 snout, mostly in anterior half of head ; maxillary and rostral barbel 

 subequal, about 0.75 diameter of eye; mouth small, slightly inferior, 

 maxillary extending to anterior margin of eye; a few pores on side 

 of snout ; gill rakers on first arch 5 + 14, those on upper arm and on 

 lower arm near angle short spinous filaments, those on lower arm 

 becoming lower and blunter, and finally reduced to a mere ridge. 



