424 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



SO it is well known to the coastal people who have given it names borne 

 by no other species : Pla hua talcua (lead-head fish) and fla hua ngem 

 (silver-head fish) in allusion to the lustrous spot, and pla hua ngon 

 (scoop-head fish). 



In recent years this fish has usually been called Panchax panchax. 

 The genus Panchax established by Cuvier and Valenciennes in 1846, 

 with Hamilton's Esox panchax becoming the type species by tauto- 

 nymy, was a synonym of Aplocheihis, which has the same type species. 



Genus ORYZIAS Jordan and Snyder 



Oryzias Joedan and Snyder, Proc. U. S. Nat. Mus., vol. 31, No. 14S6, p. 289, 1906. 

 (Type, Poecilia latipes Temminck and Schlegel.) 



The name Oryzias is equivalent to Aplocheilus of Weber and de 

 Beaufort. The applicability of this name in its present connotation 

 was discussed by the writer (Smith, 1938b) . There are various species 

 of India, Burma, Malaya, and the Indo- Australian Archipelago in ad- 

 dition to the type species {Poecilia latipes) from the ricefields of 

 Japan. The single species known from Thailand appears to be unde- 

 scribed. 



ORYZIAS MINUTILLUS. new species 



Figure 95 



Description. — Body compressed, head and anterior part of back de- 

 pressed and flattened; depth of body 3.5 in standard length; caudal 

 peduncle longer than deep; head 4.1 in standard length; eye large, 

 scarcely reaching above dorsal profile of head, about 2.4 in head ; snout 

 2.25 in eye and greater than interorbital space; mouth extending 

 0.5 distance from tip of snout to eye ; scales in lengthwise series 27 or 28, 

 in transverse series, 10, in predorsal region 19 ; a broad anal papilla. 



Figure 95. — Oryzias minutillus, new species: Type (U.S.N.M. No. 107958). 

 Drawn by Mrs. Aime M. Awl. 



Fins : Dorsal rays 6, longest ray 1.8 in head, origin of fin slightly 

 before posterior base of anal ; caudal fin as long as head, its margin 

 rounded ; anal rays 19, longest ray equal to longest dorsal ray, origin 

 of fin midway between pupil and base of caudal ; ventrals 0.5 length of 



