FRESH-WATER FISHES OF SIAM, OR THAILAND 275 



features short pectorals (contained 1.25 times in length of head), 

 origin of dorsal fin slightly in advance of that of ventrals, 42 scales 

 in the lateral line, scales of back and sides carinated, about T dark 

 brown saddles and several smaller spots on back, 3 dark cross bands 

 on dorsal, 3 or 4 such bands on caudal, and 2 such bands on the anal, 

 ventral, and pectoral fins. Agreement with R. zollingeri is very 

 close in most features, and differences may be due to age. The de- 

 scription and figure of the type show only one unbranched ventral 

 ray, which would exclude the species from the genus Homaloptera as 

 defined by Hora (1932). 



HOMALOPTERA SEXMACULATA Fowler 



Homaloptera sexmaculata Fowler, 1934a, p. 98, figs. 47, 48 (Chiengmai). 



Known from numerous specimens, 2.1 to 3.4 cm. long, from the 

 Meping at Chiengmai, this species is characterized by having the 

 origin of the dorsal fin behind that of the ventrals, 5 branched rays 

 in the anal fin, pectoral rays, ii, 12, 42 to 46 scales in the lateral line, 

 6 sharply defined blackish saddles on the back, each caudal lobe with 

 a submarginal black spot, a blackish bar extending from lower base 

 of caudal fin backward toward the spot, and a small blackish spot on 

 the caudal fin near its upper base. 



HOMALOPTERA SEPTEMMACULATA Fowler 



Homaloptera septemnuicidata Fowler, 1934a, p. 99, figs. 49, 50 (Chiengmai). 



Seven specimens, 2.5 to 3.7 cm. long, from the Meping at Chiengmai 

 are the basis for this species, which is very similar to H. sexrnacidata, 

 differing therefrom in having one more major dark spot on the back, 

 4 of the spots being postdorsal as against 3 in the other species. The 

 general pattern of coloration is practically identical in the two forms, 

 and the only difference except in the maculation appears to be in the 

 lateral-line scales, which number 42 to 46 in E. sexmaculata and 49 to 

 51 in H. seytemmaculata. It seems probable that these two forms 

 may represent a single species. 



HOMALOPTERA MODESTA (Vinciguerra) 



Helgia modest a Vinciguerka, 1SS&-90, p. 202, pi. 11, fig. 12 (Meekalan, Meetan, 



Burma ) . 

 Homaloptera modesta Hora, 1932, p. 288 (Siam, Lower Burma). 



The Thailand material representing this species, otherwise known 

 only from Lower Burma, has come from widely separated localities : 

 One specimen from a pond supplied by a stream flowing from the hills 

 at Ronpibun, Peninsular Siam, January 1927, collected by R. Hav- 

 moUer; one specimen from a waterfall stream at an elevation of 600 

 meters on Kao Sabap, Southeastern Thailand, April 18, 1930, collected 



