344 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
caudal fin; at base of each caudal fin lobe, above and below the blackish 
caudal spot, is a pale area, then rest of fin is dusky; sometimes the | 
black line along midaxis of body lies in a blackish lateral streak 
posteriorly; middorsal edge of back more intensely pigmented than 
adjacent sides, forming a more or less dark brownish dorsal streak; 
upper lip blackish, the teeth of outer row of premaxillary showing as 
pale spots in the dark pigmented area; distal margin of anal fin with a 
little intensification of the dark pigment. 
Remarks.—This new subspecies differs from B. beta beta chiefly in the 
decreased number of anal rays and in the increased number of teeth 
on the maxillary. These differences, among other average differences, 
are recorded in table 24. The largest females had nearly mature eggs 
in the body cavity. These eggs were large in diameter for such a small 
fish, though not very numerous. 
Named motatanensis after the stream system in which it was 
captured. 
BRYCONAMERICUS DEUTERODONOIDES EURYODOUS, new subspecies 
Figure 51 
Holotype. —U.S.N.M. No.121437, an example 33.2 mm. in stand- 
ard length, collected by L. P. Schultz, G. Zuloaga, Roger Sherman, 
and William Phelps, Jr., May 12, 1942, in the Rio Gu4rico and tribu- 
taries between San Sebastian and San Casimiro, Estado de Aragua, 
Venezuela. | 
Paratypes.—U.S.N.M. No. 121438, 408 specimens, 18 to 37 mm., 
taken along with the holotype and bearing same data. 
Description.—Based on the holotype and paratypes; detailed meas- 
urements were made on the former and one of the latter. These 
data, recorded in hundredths of the standard length, are given first 
for the holotype, then the paratype in parentheses, respectively. . 
Standard length in mm. 33.2 (86.2). 
Length of head 27.1 (28.5); greatest depth 31.0 (29.5); length of 
snout 6.93 (6.90); diameter of eye 10.5 (9.67); length of maxillaries 
or distance from tip of snout to posterior tip of the maxillary 10.8 
(11.1); width of interorbital 9.04 (8.84); postorbital length of head 
13.9 (13.8); least depth of caudal peduncle 12.0 (11.9); length of 
caudal peduncle 16.6 (18.0); least width of preorbital 1.54 (1.41); 
length of base of anal 24.7 (24.8); longest ray of anal fin 16.9 (16.6); 
longest ray of dorsal fin 22.6 (21.3); longest ray of pectoral fin 22.3 
(21.3); longest pelvic fin ray 15.1 (14.6); length of upper caudal lobe 
28.6 (27.6); length of lower caudal lobe 28.6 (26.8); distance from 
snout tip to dorsal origin 52.7 (51.0); snout to anal origin 61.5 (63.2); 
snout to adipose origin 85.6 (85.0); snout to pectoral insertion 24.7 
(25.7); snout to pelvic insertion 48.5 (48.8); snout to anus 60.2 (58.0); 
distance from dorsal origin to midcaudal fin base 53.0 (53.4). 
