Jordan and Evermann. Fishes of North America. 2787 



the anterior portion black with a narrow white edge ; pectorals and ven- 

 trals with anterior (outer) face white or slightly dusky; pectorals with 

 inner face of upper rays black; a black blotch covers all of inner face of 

 ventrals, except terminal half of inner rays ; barbels blackish. Closely 

 related to T. melanopus and T. multiradiatus, differing from the former in 

 the longer anal fin, from the latter in the black markings on lower fins. 

 The description of the type of T. multiradiatus (Bagrusf arioides) Kner & 

 Steiudachner, Abhandl der K. bayer Akad. der Wissen, X, I, 1864, indi- 

 cates a species with much rougher sculpturing of the head, a longer fon- 

 tanel groove, narrower occipital process, and more .'interiorly inserted 

 adipose dorsal. The type is a single specimen, 280 mm. long, from 

 Panama. (Gilbert.) (ev, in /neXavrj, ink.) 

 Tachysurus emmelane, GILBERT, Fishes Panama, MS. 1898, Panama. 



201. TACHYSURUS FURTHII (Steindachner). 



Head 3 to 3f; depth 5 to 5. D. I, 7; A. 20. Body compressed poste- 

 riorly ; profile slightly convex. Head broad, tapering forward, its great- 

 est width If to 1 in its length; width, at the angle of the mouth, 2f to 

 2* in the head. Top of head densely covered with fine granules. Occip- 

 ital process about as long as broad, with a median ridge, eniarginate on 

 its sides and at tip ; interorbital region with 4 smooth ridges, the inner 

 bordering the fontanel, the other extending obliquely backward from 

 near the posterior nasal opening; sides of head and snout with vermicu- 

 lating mucous pores. Middle of the fontanel over the pupil. Eye 

 strictly lateral, not entirely above the angle of the mouth, its center in 

 front of the posterior end of the mandible, 2 in snout, 6 to 7 in head, 3 

 to 4 in the distance between the eyes. Maxillary barbels thin, reaching 

 to the middle of the pectoral or shorter, postmentals beyond base of pec- 

 torals, or sometimes not beyond edge of gill membrane ; mentals to edge 

 of gill membrane or shorter. Jaws about equal, the upper rather thin; 

 teeth on the intermaxillaries villiform ; the mandible with villiform teeth 

 except the inner 2 or 3 series, which are granular; like the palatine 

 patches irregular, suboval, sometimes the anterior end, sometimes the 

 posterior, and sometimes both ends pointed. Gill membranes united, 

 joined to the isthmus without a free margin. Gill rakers long and slender, 

 4 + 11. Axillary pore small; vertical series of pores present. Distance 

 of dorsal from snout 2f to 2f in the length ; the dorsal spine If to If in 

 the head, on sides and front granular, with small, sharp teeth on its inner 

 margin; the first soft ray little, if any, higher than the spine. Distance 

 of adipose fin from the dorsal 3 to 3| in the length, the fin longer than 

 high, shorter than the dorsal fin. Caudal fin forked, the lobes rounded, 

 4 in the length. Anal little longer than high, the highest ray 2 in the 

 length of the head. Ventrals short, If to 2f in head. Pectoral spine 

 long and slender, 1^ to If in the head, outer margin granular, inner mar- 

 gin with short teeth. Ashy above, white below. We have examined 15 

 specimens, the largest measuring 0.29 m. The sexes do not differ exter- 

 nally. Panama. (Eigenmann & Eigenmann, Nematognathi, 90.) 



