FRESH- WATER FISHES OF SI AM, OR THAILAND 267 



defined black spot on the caudal peduncle immediately anterior to 

 the caudal fin. A feature not brought out in the description and fig- 

 ures but subsequently determined by Fowler is the presence of a deep 

 groove extending from the corner of the mouth obliquely on the snout 

 connecting with a shorter groove in which the rostral barbel rests, 

 and between the grooves a short, pointed lobe. 



The specimens from the Menam Nun June 5, 1934, and July 19, 1925, 

 contained well-developed eggs and showed minute pearl organs thickly 

 covering the top of the head and snout. The fishes were in company 

 with Garra and Gyrinocheilus. 



The type was 8.3 cm. long. The maximum size represented by the 

 material now in hand is about 14 cm. 



While it is possible that E. coatesi represents the female of E. 

 smmensis this point cannot be fully decided with the material now 

 available for examination. The fish appears to be definitely an 

 Epalzeo7'hynchos, differing from E. siamensis chiefly in coloration. 



Life colors of a specimen of E. coatesi from the Menam Mun No- 

 vember 11, 1926 : Back and sides light green, the scales with dark edges, 

 belly white ; a large round black spot on caudal peduncle and a vague 

 dark lateral band extending forward from the spot ; caudal, anal, ven- 

 tral, and pectoral fins whitish; dorsal rays yellow, membranes 

 blackish. 



Life colors of specimens from the Menam Mun February 15, 1927 : 

 General color light green, the scales of back and sides with dark base 

 and silvery edge ; a large round black spot on caudal peduncle ; top of 

 head gray-green ; belly white ; all fins light yellowish green. 



In the Korat region this fish lias a distinctive vernacular name, 

 pJa soi dok yarng. 



EPALZEORHYNCHOS STIGMAEUS, new species 



Figure 53 



Descriftion. — Depth 4.3 in standard length, 5.3 in length with 

 caudal fin ; depth of caudal peduncle 2 in its length and in head ; head 

 4.5 in standard length ; eye 4.3 in head, 1.8 in snout, 2 in interorbital 

 space ; snout 2.5 in head ; 2 rostral barbels, rather stout, 0.5 eye ; upper 

 lip with about 15 well-differentiated plicae covered with minute 

 papillae and having a free margin; no line of demarcation between 

 snout and upper lip : top of head covered with minute tubercles. 



Squamation: Scales in lateral line 31 or 32; scales in transverse 

 line from midline of back in front of dorsal fin to base of ventral fin 

 4.5-1-3, with 2.5 additional scales to midline of abdomen; scales in 

 predorsal region 10 or 11; scales around narrowest part of caudal 

 ])eduncle 14. 



