274 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



Characters on which the species are separated are : The number of 

 scales in longitudinal and transverse series, the degree of squamation 

 of the abdominal surface, the structure of the scales (whether carinated 

 or smooth) ; the position of the dorsal fin with reference to the ventrals ; 

 the number of simple rays in the dorsal, anal, and pectoral fins; and 

 pattern of coloration. Other characters differentiating the species 

 are as follows : 



Iff. Dorsal fin arising in advance of ventrals ; scales of back and sides with a 

 strong longitudinal keel ; scales in lateral line about 45 ; i)ectoral rays 

 iv, 9 or iv, 10 ; pectoral fins not reaching ventrals ; ventral rays ii, 8 ; back 

 with about 6 obscux-e dark cross bands ; upper caudal lobe with 2 or 3 



oblique dark bands; all other fins with dark cross bands < ^ollingeri 



16. Dorsal fin arising behind origin of ventrals ; scales of back and sides not 

 carinated. 

 2a. Pectoral rays ii, 12 to ii, 14 ; pectoral fins not reaching to ventrals ; ventral 

 rays ii, 8 or ii, 9; back marlved with dark saddlelike spots. 

 3a. Scales in lateral line 42 to 46 ; back with 6 blackish saddlelike spots. 



sexmaculata 

 36. Scales in lateral line 49 to 51 ; back with 7 blackish saddlelike spots. 



septeinmaculata 



26. Pectoral rays v, 8 or vi, 8 ; pectoral fins not reaching to ventrals ; ventral 



rays ii, 6; scales in lateral line 47; back and sides with numerous 



irregularly disposed black and brown spots of various sizes and shapes, 



3 black spots on side of head below eye, all fins barred with black. 



modesta 

 2c. Pectoral rays vi, 10 to vi, 12 ; scales in lateral line 37 to 39. 



4a. Pectoral fins longer than head, extending far on ventral fins; pectoral 

 rays vi, 11 or vi, 12 ; ventral rays, ii, 6 ; scales in transverse series to 

 base of ventral fin 6-1-4.5 ; back with about 6 black saddle-shaped 



bands ; all fins v/ith irregular dark bands smithi 



46. Pectoral fins shorter than head, extending to base of ventral fins ; 

 pectoral rays vi, 10 ; ventral rays ii, 7 ; scales in transverse series to 

 base of ventral fin 8.5-1-5 ; a narrow dark stripe from head to base 

 of caudal fin ; fins unmarked lineata 



HOMALOPTERA ZOLLINGERI Bleeker 



Eomaloptera zollingeri Bleeker, 1853 (74), p. 159 (Batavia). — Webeb and 

 DE Beaxtfobt, 1916, vol. 3, p. 14 (Slam).— Hoba, 1932, p. 280 (upper Bang- 

 pakong River). 



Eomaloptera maxinae Fowler, 1937, p. 152, figs. 52, 53 (Tachin). 



This species, known from Java and Sumatra, has received status 

 as a Thailand fish through representation in the British Museum by 

 a specimen from the upper Bangpakong River. This specimen, pre- 

 sented by the Siamese Museum, is the one referred to by Weber and 

 de Beaufort (1916, vol. 3, p. 14) and Hora (1932, p. 280) . 



A length of 10 cm. is attained. 



The species called Homaloptera maxinae by Fowler may represent 

 an immature specimen of the present form. The type and only known 

 specimen of H. viaxiTiae, 4.4 cm. long, has as its principal diagnostic 



