FRESH-WATER FISHES OF SIAM, OR THAILAND 95 



do not show the full coloration. All specimens, regardless of the spots 

 along the side anteriorly, have the black along the posterior part of 

 the side, with the pale band above it. 



Tyye and paratypes. — The type (U.S.N.M. No. 107961), a male 

 specimen 7.28 cm. long, was taken August 23, 1934, in Huey Me Lao, a 

 mountain stream on Doi Hua Mot, in Northern Thailand. Paratypes 

 bear the following U.S.N.M. numbers : 107806, 107892, 107921, 108130, 

 108863, 117725-117728, 119448, 119449, 119525, 119526. 



Other specimens. — Five other specimens taken at the same time and 

 place are 5.9 to 8.5 cm. long, and seven others taken August 22 at the 

 same place are 6.9 to 7.7 cm. long. From Huey Nam Puat, a tributary 

 of the Mekong at Ban Nam Puat, in French Laos, just across the 

 boundary from Nan Province in Northern Thailand, H. G. Deignan 

 collected eight specimens on April 26, 1936; these are 6.7 to 8,2 cm. 

 long. This locality is about 140 kilometers east of the point in North- 

 ern Thailand where the type and other specimens were obtained. 



Apparentlj'^ referable to D. myersi is a series of 25 specimens taken 

 by H. G. Deignan, in December 1936 and January 1937, from the 

 Menam Mao and various brooks tributary thereto and from the Huey 

 Median, in the Mekong Basin in Northern Thailand. All the speci- 

 mens are small and none shows the preorbital shelf. They are assigned 

 to the present species on scale and fin-ray characters, including the 

 possession of 8 branched rays in the dorsal fin, on the biserial 

 pharyngeal teeth, and on the general coloration. 



Remarks, — All the specimens from Huey Nam Puat taken in April 

 are females with the eggs approaching ripeness ; in those from Huey 

 Me Lae taken in August the sexes are about equally divided and some 

 of the females have well-developed eggs. 



This species is named for Dr. George S. Myers, professor of biology 

 in Stanford University and formerly assistant curator of fishes in the 

 United States National Museum, in recognition of his valuable studies 

 of Oriental fishes. 



Genus DANIO Hamilton 



Danio Hamilton, Fishes * * * River Ganges, pp. 321, 390, 1S22. (Type, 

 Cyprinus clangila Hamilton.) 



The daniids are small, attractively colored, active fishes of small 

 watercourses; in Thailand they are commonest in mountain rivulets. 



In 1916 Weber and de Beaufort (vol. 3) proposed Brachydanio as a 

 subgenus of Danio for forms having 7 branched dorsal rays and in- 

 complete or absent lateral line, leaving Danio in the strict sense for 

 forms with 12 to 16 branched dorsal rays and complete lateral line. 

 Myers, Hora, and others gave Brachydanio full generic rank, a course 

 that was justified by material available to them. It is apparent now, 

 however, that a sharp line cannot be drawn between Danio and Bia- 



