FRESH-WATER FISHES OF SIAM, OR THAILAND 



389 



MYSTUS HAVMOLLERI H. M. Smith 



FiGUEE 86 



Mystus havmolleri Smith, 1931a, p. 24 (Ronpibun). 



Mystus stigmaturus Fowler, 1934a, p. 94, figs. 41, 42 (Nakon Sritamarat) ; 1939, 

 p. 58 (Trang). 



This species seems to be limited to a comparatively small area in 

 the Province of Nakon Sritamarat, Peninsular Thailand. It was first 

 taken in 1927 in a small stream near Konpibun by the late R. Hav- 

 moller, and next met with in 1933 in the waterfall stream on Kao 

 Chong, near Trang. 



The largest specimen in hand is 9 cm. long. 



Figure 86. — Mystus havmolleri H. M. Smith. Drawn by Nai Chote Suvatti; courtesy 

 of the Thailand Government. 



It is believed that M. stigmaturus Fowler, described from six speci- 

 mens 6.8 to 8 cm. long, is this fish, the only difference mentioned by 

 Fowler being in the color pattern. His specimens, larger than the 

 type of M. havmolleri^ seem to represent simply a later, and probably 

 more typical, arrangement of the markings. 



The vernacular name in the Trang district is pla hayeng khao. 



MYSTUS CAVASIUS (Hamilton) 



Pimelodus cavashts Hamilton, 1882, pp. 203, 379 (Gangetic provinces). 



Eypselohagrus macroncma Bleekeii, 1865 (356), p. 175 (Siam). 



Macrones nigriceps Peters, 1868, p. 271 (Siam). — Webek and de Be:aufobt, 1913, 



vol. 2, p. 337, fig. 145 (Siam).— Hora, 1923b, p. 171 (Nontaburi) ; 1924a, p. 468 



(Tale Sap, inner lake). 

 Hypselobagrtis nigriceps Sauvage, 1881, p. 161 (Menam). 

 Macrones cavasius Kaeoli, 1882, p. 178 (Siam). 

 Mystus nigriceps Fowler, 1934a, p. 94 (Chiengmai, Chiengsen) ; 1934b, p. 337 



(Bangkok) ; 1935a, p. 102 (Bangkok) ; 1937, p. 146 (Bangkok, Pitsanulok, 



Kemarat). 

 Mystus rhegma Fowleb, 1935a, p. 102, fig. 27 (Bangkok). 



The range of this species extends from Java, Borneo, and Sumatra 

 to Malaya and Thailand, and thence to Burma and India. The species 



590087 — i5 26 



