Dec. 28,1916. FisHes or PANAMA— MEEK AND HILDEBRAND. 255 
inward near the tips; premaxillaries and the dentaries of about equal 
width; mandibular ramus about equal in length to interorbital width, 
3-25 to 4 in length of head; interopercle freely movable, bearing about 
8 enlarged spines and several short ones, the longest spine usually 
reaching lower third and occasionally to the middle of pectoral; head 
and snout without prominent ridges or carinations; scutes on body 
spinulose, but not carinate; ventral surface of head and abdomen naked, 
also nearly the entire ventral surface of caudal peduncle, the median line 
posteriorly crossed by a single scute; occipital bordered by 2 scutes; 
3 median scutes in advance of dorsal; dorsal fin moderately elevated, 
the spine 1.65 to 2.15 in head, its origin a little in advance of ventrals, 
nearer tip of snout than base of caudal; base of dorsal about equal to 
length of snout; adipose fin wanting; caudal peduncle above with a low 
keel; caudal fin obliquely truncate, the lower rays the longest; anal fin 
wanting; ventral fins moderately developed, equal to or slightly longer 
than snout; pectoral fins large, reaching base of anal in young, and to 
or past middle of ventrals in adult. 
Color dark gray above; pale below. Fins with dark spots on rays, 
most numerous on dorsal and caudal on which they form more or less 
distinct bars. 
There are at hand 52 specimens of this species. They vary in length 
from 25 to 75 mm. All are from small mountain streams near Cana in 
the upper Rio Tuyra Basin. 
11. Genus Loricaria Linnzus. 
Loricaria Linnzus, Syst. Nat., Ed. X, 1758, 307; Bleeker, Neder. 
Tijdschr. Dierk., I, 1863, 80 (type Loricaria dura Linnzus = Lori- 
caria cataphracta Linnzus). 
Body elongate, usually depressed throughout; sfiout pointed or 
rounded; ventral surface flat, the abdomen wholly or in part covered 
with bony or granular plates, or sometimes with small granules or 
entirely naked; orbit with posterior notch; teeth bifid, not setiform, in 
small or moderate numbers; caudal fin emarginate, one or both of the 
outer rays often produced. 
KEY TO THE SPECIES. 
a. Ventral surface of abdomen completely armed with bony plates. 
b. Lateral keels 2, becoming united on the 15th or 16th scute; pre- 
dorsal scutes feebly carinate; abdomen with several series of small 
plates between the enlarged lateral ones; no naked area behind 
pectoral; maxillary barbel shorter thaneye. suracantha, p. 256. 
