262 
BUU/ETIN OF THE BUREAU OF FISHERIES 
10. Anableps dovii Gill 
Four-eye; Cuateo-ojo 
Anableps dowei Gill, Proc, Ac. Nat. Sci., Phila., 186r(1862), 4 (Panama; where it quite certainly does not occur). 
Anableps dovii Regan, Biol. Cent. Amer., Pisces, 1907, 108. 
Head 3.6 to 4.3; depth 4.4 to 7.5; D. 8 to 10; A. 10, rarely 9; scales 62 to 73. 
Body very elongate, notably depressed anteriorly, compressed posteriorly; 
depth of caudal peduncle 2.2 to 3 in head; head strongly depressed, flat above, its 
depth between eyes about half its width; snout broad, its length 2.9 to 4 in head; 
eye rather large, the cornea with a somewhat thickened, black, longitudinal bar in 
the middle, dividing the eye into an upper and a lower half, its diameter, 3.6 to 5.9 
in head; interorbital deeply concave, 3.3 to 5.55 in head; mouth broad, almost 
wholly transverse; premaxillaries broad, excessively protractUe; maxillary rather 
broad, reaching anterior margin of eye; teeth small, in a broad villiform band in 
each jaw; scales rather small, enlarged on head; dorsal small, situated posteriorly, 
its origin at least an eye's diameter behind vertical from end of anal base; caudal 
fin rather broadly rounded; anal fin similar to the dorsal, its origin about equi- 
distant from margin of opercle and tip of caudal in adult, much further forward in 
Fig. 17. — Anableps dovii Gill 
young, modified into an intromittent organ in the male, the anterior rays enveloped 
in loose scaly skin, extending to the end of the longest rays, where there is a perfora- 
tion; ventral fins short, reaching to or a little past the vent in the young, failing to 
reach this point in the adult, pectoral fins moderate, 1.25 to 1.6 in head. 
Color of a fresh specimen, 115 mUlimeters long, dark greenish above; white 
underneath; sides -vnth. a white lateral band about half as wide as eye, bordered 
above and below by black; back crossed by several indistinct black bars; eye 
with a median black stripe, the upper half dark, the lower half white; dorsal dark 
green; caudal somewhat lighter green, with black on distal parts; anal, ventrals, 
and pectorals light greenish, the pectorals with black on lower half. In larger 
examples the lateral band is yellow and it is broken up into spots anteriorly. 
This species is represented by 36 specimens, ranging from 50 to 235 millimeters 
in length. It is common in some localities but scarce or wanting in others. It 
inhabits both lakes and streams. In the streams it is partial to the quieter places. 
This species is especially common in Lake Guija and in the outlet, the Rio del 
Desague. It is also very common in the Rio Lempa in the vicinity of Suchitoto. 
A single fish was seen and captured in salt water at the wharf at Cutuco. The 
fish swim at the surface with the upper half — that is, the portion above a dark 
longitudinal band of the modified superior eye — above water, and they are usually 
