Cope.] *^^ [Jan. 5, 



_6_ 

 ter of eye, and entering length of head 2.33 to 2.5 tunes. Sca]es,~37~; Ra- 



dii, D. 11 ; A. 20. Pectoral fin reaching base of ventral ; ventral not 

 reaching anal. No denticulations on maxillary bone. Color, silvery ; a 

 silver lateral stripe, with humeral and caudal spots. The humeral spot is 

 subround and the caudal extends to the end of tlie median caudal rays. 



Total length, 74 mm.; length to base of caudal fin, 60 mm.; length to 

 first anal ray. 40 mm.; length to base of ventral (oblique), 28 mm.; length 

 of head, 16 mm. 



Eighteen specimens of this species are before me. It is allied to the 

 T. fasciatus Cuv., T. hrevimamis Gunther, and T. jenynsii Steindachner. 

 The body is deeper than in the first named, and the frontal region is 

 wider ; the muzzle is shorter and the maxillary bone is not denticulate. 

 From T. brevimnnus it differs in the deeper body, larger eye, and longer 

 pectoral fln. The T. jenynsii has a narrower front, only 33 scales of the 

 lateral line, and the humeral spot a vertical bar. According to Stein- 

 dachner's figure, the dorsal outline descends towards tlie dorsal fin ; in 

 T. laticeps it rises to that fin I would have suspected that this species 

 might be the T. ihringii of Boulenger, but one of tlie principal characters 

 of that species, as well as of the T. alburnus of Hensel, is that it has but 

 10 dorsal radii. The T. obscurus Hens, has the interorbital diameter equal 

 the eye, and a vertical humeral spot. 



Tetragonopterus pliodus sp. nov. 



Form rather elongate, depth entering length (less caudal fin) three 

 times ; length of head entering the same four times. Maxillary bone 

 extending beyond anterior border of orbit, supporting several tridenticu- 

 late teeth on its proximal portion. Eye large, much exceeding muzzle, 

 entering length of head 2.35 times, and a little exceeding the interorbital 



4 



width. Scales, sf) . Radii, D. 10 ; A. 19 ; V. 9. Pectorals not reaching 



~T' 

 ventrals, nor ventralsthe anal fin. Dorsal originating a little posterior to 

 line of origin of ventrals. Silvery, with a broad, distinct, silver lateral 

 band. No spots of any kind. 



Total length, 70 mm.; length to base of caudal fin, 57 mm.; length to 

 base of anal, 33 mm.; length to base of ventral (oblique), 26 mm.; length 

 of head, 13 mm. 



This is apparently a rare species, only two individuals being contained 

 in the collection. It has many peculiarities, one of which is the posses- 

 sion of only ten rays in the dorsal fin. It shares this character with the 

 T. alburnus of Hensel from the same region, but this species has 27 rays 

 in the anal fin and the body is more elongate. It has some points in 

 common with the T. ihringii (Boulenger, Amer. Magaz. Nat. Bist., 1891, 

 p. 172). Boulenger does not mention the maxillary teeth, which he 

 could scarcely have overlooked. It has also one or two additional rows 



