GILBEKT AND STARKS — FISHES OF PANAMA BAY 33 



Head 3| in the length; depth 4|; tip of snout to front of dorsal 24; distance between dorsals 

 3|; distance from base of inner ventral ray to front of anal 6f. Eye 4 in interocular, 8 in head; 

 greatest width of head i| in its length; length of snout 2 yV I width of mouth 2|; distance between 

 anterior nostrils 6| (5I m/urthii)\ pectoral spine equaling length of head behind front of pupil; dorsal 

 spine equaling length of head behind posterior margin of ];)U]iil; base of adipose fin equaling base of 

 dorsal behind the spine. 



The snout is convexly rounded anteriorly, less depressed than in Jurlhii. The maxillary 

 barbel barely reaches gill-opening, when laid horizontally backward: the outer mental barbels reach 

 margin of gill-membrane on under side of head. 



The palatine patches of teeth are narrowly elliptical, their length i^ times the diameter of the 

 orbit; they are narrowly separated in front, the interspace | diameter of pupil; the inner mandibular 

 teeth next the symphysis are coarsely granular, like the palatine teeth. 



Gill-membranes broadly united to the isthmus, without free fold, the width of the complete 

 union with the isthmus more than twice the diameter of the eye (much narrower, less than diameter of 

 eye m/iirt/iii). Gill-rakers rather strong, 5 + 9, the longest f the diameter of the eye. 



Top of head much more coarsely granulated than in fiirthii; the groove is confined to the 

 granulated area, terminating at a point f diameter of pupil in front of the base of the occipital process. 

 Anteriorly, the fontanel depression is evident, but contains no definite groove at any point. The occipital 

 process is very broad, wider at base than long, much shorter than in fiirthii, the median portion not 

 elevated as in the latter; a raised line representing an obsolescent keel is present on the median line of 

 the anterior two-thirds. The predorsal plate is narrow, sculptured like the occiput on its anterior 

 transverse portion only. 



The dorsal and pectoral spines are slender, rugose anteriorly, but without teeth except near 

 the tips; the teeth on the posterior margin of the dorsal spine are scarcely visible, being smaller than 

 mfurthii; the inner pectoral teeth are stronger and less numerous than m fiirthii. The type is a male, 

 with the ventral fins failing to reach the front of the anal by half their length. The vent is midway 

 between ventrals and front of anal. The pectoral pore is small, slit-like. 



The skin is thicker and less delicate than in fiirthii, and the color is darker, the upper parts 

 dark brownish, with obscure bluish reflections. Barbels all more or less dusky. 



50. Tachysurus multiradiatus (Gnniher). 



Not seen by us. The type specimen was recorded by Kner & Steindachner, 

 1864, p. 227, as Bagrus ? arioides, from the Rio Bayano near Panama. A second 

 specimen has now been listed by Boulenger, 1891, p. 2, from Rio Cianati, Darien. 



51. Cathorops hypophthalmus {Steindachner). 



Known only from the types, and from two specimens secured by Gilbert in 

 1881; all from Panama. 



52. Cathorops gulosus {Eigenmann & Eigenmann). 



Two specimens were secured, 230 and 245 mm. long. None others are 

 known save the types, from Panama, which are in the Museum of Comparative 

 Zoology. 



Our specimens agree for the most part with Eigenmann's description. The 

 following details may be placed on record: 



