Pearson: Fishes of the Rio Beni Basin 47 
The nature of the lateral line, scales, and armature of the 
cheeks puts it in the Chalcininse. 
Clupeacharax anchoveoides Pearson, sp. nov. Plate XI, fig. 2, 
and Plate VII, fig. 3. 
17356, 1 type, 58 mm., Cachuela Esperanza. Mar., 1922. 
Head 4 2/5; depth 41/3; D.10; A.40; lateral line 30, 5 in 
a transverse series between the origin of the dorsal and the 
anal; body elongate, greatly compressed, deepest midway be- 
tween the dorsal and the base of the head; second suborbital 
covering almost the entire cheek, leaving a narrow naked 
area posteriorly; length of the snout less than the diameter 
of the eye; 2 teeth in the anterior series of the premaxillary, 
each tooth with a large point and a smaller one on the inner 
margin; 5 five-pointed teeth in the inner series; no teeth on 
the maxillary ; mandible with a series of 3 five- to six-pointed 
teeth, the second tooth a little the larger; maxillary long and 
slender, widened in front, its inner margin slipping under the 
preorbital for its entire length, its length 2 1/3 times in the 
head; interorbital convex, equal to the snout in length; nos- 
trils together, near the eyes; frontal fontanel very narrow, 
less than the diameter of the eye in length ; parietal fontanel 
triangular, its width about 1/3 the diameter of the eye; gill 
membranes free from the isthmus and from each other ; lateral 
line complete, its course suddenly dropping a short distance 
behind the head, then running straight back just above the 
anal leaving a single scale between it and the anterior third 
of the anal, touching the posterior 2/3 of the anal, just back 
of the anal it bends sharply upward and ends on the last scale 
at the middle of the caudal base; scales cycloid, usually with 
a single median longitudinal line and a vertical line which is 
covered by the preceding scale, sometimes another line from 
the point of crossing of the median and vertical lines; pec- 
torals extending beyond the middle of the ventrals; ventrals 
not reaching anal by a distance equal to one-half their length ; 
origin of dorsal above the eleventh anal ray, its distance from 
the base of the caudal 13/4 times in its distance from the tip 
of the snout, the highest ray slightly less than the length of 
the eye and snout; caudal equal to the head in length, rather 
deeply forked. 
A broad silvery lateral band ; a narrow dark mid-dorsal line, 
