240 Annals of the Carnegie Museum. 



dark spots on the tail; nape just behind the gill-opening dark; dorsal 

 fin with a series of black streaks; dorsal, anal, and caudal fins dusky; 

 other fins whitish. 



Total length 96 mm. 



Described from a specimen from Ako, collected by T. Aoki in 

 December, 1916. 



Habitat: One of the most abundant of the Formosan Cyprinidcs. 

 My specimens came from Tamusui River; Daiko River; Daito River; 

 Shinchiku; Dakusui River; Rigyokutsu, Xanto; Sobun River; Shimo- 

 tamusui Ri\er; Ako; Heirinbi; Inzanpo; Tensonpi; Suwo; Giran. 



Remarks: Jordan and Evermann described a species of the genus 

 Zacco from Suwata and Taihoku, Formosa, under the name Zacco 

 pachycephalus (Giinther) (Proc. U. S. Nat. Mus., XXV, 1903, p. 322). 

 As shown in the following table, the two specimens which are contained 

 in the Stanford collections have ten scales between origin of dorsal 

 and lateral line, three scales between the latter and the root of ventral, 

 and forty-eight to fifty scales in lateral line, instead of 12-55-4 ^^ ^^ 

 the type of Giinther's Z. (Opsariichthys) pachycephalus. Moreover, 

 the other characters of these two specimens agree quite well with 

 those of Zacco temmiucki. It is reasonable, therefore, to transfer 

 Jordan & Evermann's Zacco pachycephalus to the present species. 



38. Zacco pachycephalus Giinther. 



1868. Opsariichthys pachycephalus Gunther, Cat. Fish., VII, p. 297; Formosa. 



Head 3.63 in length; depth 4; D. II, 8;.A. 3, 9; P. 14; V. 9; width of 

 head 2 in its length; eye 3.6 in head; interorbital space 3.14; snout 3; 

 pectoral 1.22; ventral 1.66; fifty- three scales in the lateral line, twelve 

 scales in an oblique series between origin of dorsal and lateral line, 

 nine scales between the latter and the middle of belly, four scales 

 between lateral line and the root of the ventral; pharyngeal teeth 

 5, 3, I — I, 3, 4; gill-rakers 2 + 8. 



Body oblong, compressed; head moderate, its top more or less 

 flattened, cheek with traces of tubercles; snout pointed anteriorly, 

 its dorsal profile curved; mouth oblique, its angle extending beyond 

 the vertical through the anterior margin of the orbit; lower jaw very 

 slightly shorter than the upper; eye superior; nostrils close together, 

 supra-lateral, in front of the eye. 



Origin of dorsal at a point midway between tip of snout and base of 

 caudal, o])posite to that of the ventral; pectoral fin not extending to 



