JORDAN AND THOMPSON: FISHES OBTAINED IN JAPAN IN 1911. 221 



Dorsal inserted nearly midway between snout and base of caudal, its base 1.2 

 in head, its height (first rays) 1.5, these when depressed just reaching base of last 

 ray; anal inserted under last dorsal rays, its base 1.5 in head, its margin nearly 

 straight, tips of first raj's not reaching base of last; height of first rays 1.66 in head; 

 ventrals as long as anal rays, inserted under first dorsal ray; pectorals 1.25 in head. 



Color plain, save for a blue-black lateral stripe along center of caudal peduncle, 

 nearly half as wide as pupil, tapering to a point under center of dorsal, its broadest 

 part on caudal peduncle, not reaching caudal; a sharply margined blue-black 

 shoulder spot as large as pupil; dorsal with two clear stripes half way up the rays, 

 alternating dark, the margin being dusky; anal similar; other fins colorless, save the 

 dusky caudal; peritoneum black. 



This species is very hard to distinguish superficiality from Acheilognathus 

 moriokce, from which it differs in more oblique mouth, less falcate anal fin, larger 

 eye, and less strongly marked coloration. The most striking difference is in the 

 plication of the teeth. 



AU the males of this species in hand have lesser depth than the females ; anal 

 black, edged with white, ventrals black, the first two rays white; and the ventral 

 surface of the belly black or pigmented. 



Our only specimen from Okayama, a male, has a shorter caudal peduncle and 

 smaller eye than any of our examples from Lake Biwa, and is much paler in color. 

 One specimen from Nagoya has a similar caudal peduncle, but is in other respects 

 similar to specimens from Lake Biwa. 



" Tabira " is a vernacular name for these fishes about Lake Biwa. 



51. Acheilognathus cyanostigma Jordan & Fowler. 

 Lake Biwa, at Matsubara, Nos. 6063a-d. 



Acheilognathus cyanostigma Jordan & Fowler, Proc. U. S. Nat. Mus., XXVI, 1903, p. 820, Fig. 2; Lake 

 Biwa, at Matsubara, and Lake Yogo, in Mino. — Tanaka, Ann. ZooL Jap., VII, Part 1, 1908, p. 3; 

 Matsubara, on Lake Biwa. 



The following is a description of the type and cotypes of this species in the 

 ichthyological collection of Stanford University, with numerous other specimens 

 from Matsubara, Lake Biwa. 



Depth 3.33 in body-length to base of caudal; D. Ill, 8; A. Ill, 8 or 9; scales in 

 lateral line 38, in transverse series between insertions of vertical fins 6/4; pharyngeal 

 teeth 5-5. 



Head 4; snout 3.7 in head; anterior edge of premaxillaries level with lower edge 

 of pupil; mouth horizontal; gill-rakers 2+8, longest at angle, short and thick; 

 pharyngeal teeth hooked, plicate on lower surfaces, usually a narrow grinding sur- 



