32 BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



mouth 2.35; width of head 1.33; depth of head 1.73; D., 1.6; A., 18, 

 including rudiments. Upper profile of head nearly straight; inter- 

 orbital broad and flat; snout blunt, rather truncate; granular area 

 on top of head similar in outline to that in G, jordani^ the diverging 

 points extending anteriorly to above anterior margin of pupil; 

 fontanel groove reaching nearly to occipital process, slightly nar- 

 rower in its posterior half than anteriorh% in this respect differing 

 from the type; slightly constricted at the center where it enters the 

 granular area; palatine teeth in large ovate patches; the vomerine 

 ]3atches meeting at the median line; maxillary barbel reaching base 

 of pectoral, the postmental barbels to edges of gill opening and 

 ventral barbels about three-fifths of distance from their base to gill 

 opening; humeral spine concave on its upper surface, sharp pointed. 

 (Dorsal and pectoral spine broken) ; longest dorsal raj's 1.6 in head; 

 base of adipose dorsal 4; caudal deeply forked; anterior anal rays 

 longest, 2.16; middle rays of ventral longest, 1.6, upper surface of 

 inner rays provided with a much thicker fold of integument, tips 

 of ventrals reaching past insertion of anal ; pectoral as long as ven- 

 trals. 



Color of back and sides above lateral line, bluish black; lower 

 parts silvery white; top of head similar in color to body; on sides 

 below eye, this color abruptly white, the line of demarcation less 

 distinct on opercles; a large black spot behind gill opening covering 

 humeral spine ; base of dorsal spine black, rest of fin pale ; adipose fin 

 light distally; anal dark, margined with lighter, a small dark area 

 at base of ventrals. 



Genus TACHYSURUS Lacepede. 



36. TACHYSURUS EQUATORIALIS Starks. 

 BAGRE. 



Tachysurus equatorialis Starks, Fishes from Ecuador and Peru, Proc. U. S. 

 Nat. Mus., vol. 30, 1906, p. 766, figs. 3 and 4 ; Guayaquil, Ecuador. 



Two specimens, field No. 09568, IT and 18.6 cm. in length, from 

 Paita. 



Head 3.85 in length; depth 5.7; eye 5 in head; snout 2.66; width 

 between angles of mouth 2.66; interorbital 2.11; longest dorsal ray 

 1.29 ; longest anal ray 2.25 ; pectoral 1.54 ; ventral 1.6 ; caudal lobe 1 ; 

 depth of caudal peduncle 3.1 ; D. I, 6 ; A., 23. 



Upper anterior profile appearing perfectly straight and rather 

 steeply sloping from dorsal spine nearly to tip of snout, where it 

 curves very slightly downward; head as viewed from side, sharply 

 wedge-shaped ; top of head very finely granular, the granulated area 

 ending some distance behind eyes, but continued forward to a point 

 on each side, as a slightly rugose surface covered by thin skin, to 



