The Fresh Water Fishes of the Island of Formosa. 237 



Such being the case, it is inadvisable to specilically separate the For- 

 mosan form from the Japanese Z. platypus. 



Description of the Type Specimen of Zacco evolans, Jordan & 



Evermann. 

 (No. 7129; Stanford collection; Taihoku; Tada coll.) 



Head 4.22 in length; depth 3.42; D. II, 7; A. 3, 9; P. 15; V. 9; width 

 of head 2 in its length; eye 3.33 in head; interorbital space 3; snout 3; 

 forty-four scales in the lateral line, eight scales in an oblique series 

 between origin of the dorsal and lateral line, four scales between the 

 latter and the middle of belly, two scales between lateral line and the 

 root of the ventral; ventral 1.20 in head; pectoral considerably longer 

 than the head. 



Body elongate, compressed; dorsal profile convex; head moderate, 

 its top very slightly arched; snout pointed anteriorly; mouth oblique, 

 its angle extending to a vertical through the anterior border of orbit; 

 jaws subequal; eyes moderate, superior; nostrils close together, in front 



Measurements of Zacco platypus. 



Locality. 



Choso River 



Tamusui River . . 

 Tamusui River. . 

 Tamusui River. . 

 Tamusui River. . 



Shinchiku 



Taihoku 



(Type Z. evolans) 



Tsuchiura 



(S. No. 7340) 



Tsuchiura 



(S. No. 7340) 



Tsuchiura 



(S. No. 7340).. . . 



Lake Biwa 



(S. No. 22623).. • 



Lake Biwa 



(S. No. 22623). • • 



Lake Biwa 



(S. No. 22623).. . 



4 3-71 

 4 4-66 

 3.864.61 

 4 5 

 4 |4-25 

 4 14-35 



4.22 3.42 IL 7 

 3-8o|n, 7 



7 

 7 

 7 

 7 



• 4 '4-71 n. 7 



4 



4-30 

 4.24 

 4 



3-64 

 4-50 

 4-75 



4-5015 



4 8-43-4 Beyond V. 



3-33 9-44-4 Reaching V. 



3-33 1 8-44-4 Reaching V. 



3-33 j 8-43-4 Reaching V. 



3.40 8-42-4 Reaching V. 



3 8-44-41 Not to V. 



3-338-44-4 Beyond V. 



5iS 



4 



4-50 



3-66 



4 



4 



4 



8-44-4 Reaching V 

 8-44-4 Reaching V. 



8-44-4 Not to V. 



I 

 8-44-4 j Not to V. 



8-44-4 Not to V. 



8-42-4 1 Not to V. 



120 



115 

 100 

 108 

 107 

 92 



135 

 150 



148 

 112 

 138 

 120 



of eye; lower part of pre-operculum, sides of the snout, and outer part 

 of the lower jaw with a number of round tubercles. 



Origin of the dorsal nearer tip of snout than base of caudal, opposite 



