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BULLETIN OF THE BUREAU OF FISHERIES 
2. Genus ROEBOIDES Giinther 
Rceboides Gunther, Cat. Fish., Brit. Mus., V, 1864, 345 (type Anacyrtus guatemalensia Giinther). 
Body compressed; dorsal profile concave at nape in adult; teeth mostly pointed, 
in 3 more or less definite series in upper jaw, the outer ones of both jaws directed 
forward; shoulder girdle with a large spine; lateral line straight, complete; anal 
fin very long, with 45 or more rays; adipose fin well developed. 
2. Rceboides salvadoris sp. nov. 
Plate ado; Sardina; Alma Sec a; Ulumina 
Type no. 87215, U.S.N. M. Length, 91 mm. Rio Sucio, Sitio del Nino. 
Head 3.35 to 4.25; depth 2.55 to 3.4; D. 11; A. 46 to 50; scales 15 or 16—72 to 
82; pores in lateral line variable, 53 to 73. 
Body strongly compressed; the dorsal region elevated; profile deeply con- 
cave at occiput in the adult, not at all concave in young of 40 millimeters and 
less in length; head comparatively small; snout blunt, 3.25 to 3.9 in head; eye small, 
3.2 to 3.8 in head or 11.5 to 15 in body; interorbital 3.2 to 3.8 in head; mouth large; 
maxillary notably broader than preorbital, reaching anterior margin of pupil to 
middle of eye, 2.1 to 2.5 in head; teeth moderate, 4 with broad conical bases, 
directed forward on margin of snout, 2 to 4 similar ones at sides on the maxillary 
and 2 on the margin of mandible; outer margin of maxillary with pointed teeth; 
premaxillary with irregular teeth, irregularly placed, some of the inner ones wdth 
small basal cusps; mandibular teeth all pointed, the anterior ones the largest, none 
of them definitely tricuspid; gill rankers short, 8 or 9 on the lower limb of the 
first arch; shoulder girdle with a spine, pointed both anteriorly and posteriorly, 
reaching nearly to base of pectoral; lateral line complete, nearly straight; scales 
very small; dorsal fin moderately elevated anteriorly, its origin equidistant from 
tip of snout and base of caudal or more usually a little nearer the former; the 
elevated portion measured from the origin of the fin to the tip of the longest rays 
3.45 to 4.3 in body; adipose fin moderate, situated over the posterior part of anal; 
caudal fin deeply forked; anal fin very long, its origin equidistant from tip of snout 
and base of last anal ray or more usually a little nearer the former; ventral fins 
rather short, reaching opposite the foiu-th to the sixth anal ray, 5.25 to 6.4 in body; 
pectorals moderate, failing to reach the origin of anal, 1.3 to 1.45 in head or 4.6 
to 5.7 in body; vertebrae 12 + 22. 
Color in life silvery, slightly olivaceous on back; sides with a silvery band, 
most definite posteriorly; base of caudal with dark punctulations on a silvery 
background, forming a dark caudal spot; a smaller dark spot just above the lateral 
line and posterior to the vertical from base of ventrals, deeper than long, and 
variable in intensity, but not entirely wanting on any of the specimens at hand; 
upper parts of head dark; fins all greenish. 
Many specimens of this species, ranging from 35 to 105 millimeters in length, 
were preserved. This fish is not universally distributed in the waters of El Salvador. 
It is abundant among vegetation in Lake Guija, apparently rather rare in Lake 
