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 wliite 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. mdanopus and T. multiradiatus, differing from the former in 

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

 The description of the type of T. multiradiatus {Bagrus? arioides) Kner & 

 Steindacliuer, 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 anteriorly inserted 

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

 Panama. (Gilbert.) {'sv, in /.leXavr/, 'u\k.) 



Tachygums emmelane, Gilbert, Fishes Panama, MS. 1898, Panama. 



201. TACHTSURCS FURTHII (Steindachnei). 



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

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

 est width If to Ijr in its length; width, at the angle of the mouth, 23^ to 

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

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

 its sides and at tip; interorbitnl region with 4 suiooth ridges, the inner 

 bordering the fontanel, the other extending obli([uely 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 bej^ond base of pec- 

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

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

 teeth ou 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 jiresent. Distance 

 of dorsal from snout 2f to 2f in the length ; the dorsal spine If to 1| in 

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

 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 tlian the dorsal fin. Caudal liu 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, IJ to 2^^ in head. Tectoral spine 

 long and slender. If to It in tlie head, outer margin granular, iuner mar- 

 gin with shoit teeth. Ashy al)ove, wliite below. We have examined 15 

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

 nally. Panama. (Eigenmaun A: Eigenmanu, Nematognathi, 90.) 



