ANNOTATED LIST OF THE SPECIES 267 
345. GASTEROPELECUS STERNICLA (Linnaeus) 
Gasteropelecus Gronow, 1756, Mus. Ichth., IT, 7, no. 255, pl. vu, fig. 5. 
Clupea sternicla Linnaeus, 1758, Syst. Nat., ed. x, 319, Surinam. 
Gasteropelecus sternicla Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., XXII, 169, pl. 
640, Surinam; 
Eigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 56; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 439; 
Regan, 1913, Ann. Mag. Nat. Hist., (8), XII, 281, Rio Ucayali. 
Salmo gasteropelecus Pallas, 1769, Spic. Zool., VIII, 80, pl. i, fig. 4; 
Bloch, 1785, Ausl. Fische, III, 66, pl. xevun, fig. 3; 
Bloch and Schneider, 1801, Syst. Ichth., 418. 
The Amazons 
———., 5, 24-33 mm., pond, Iquitos, Allen, September, 1920. 
346. GASTEROPELECUS CORONATUS Allen, sp. nov. 
Plate XIV, fig. 4 
————, 1, 47 mm., from mandibular symphysis to end of middle caudal rays, type, brook, Rio 
Itava, near Iquitos, September, 1920. 
————, 5, 31-38 mm., same measurement, Yurimaguas creek, Allen, November, 1920. 
Like Gasteropelecus in the adipose fin, curvature of the dorsal contour, but near 
Carnegiella in dentition and general body form. Readily distinguished from known 
species of either by the teeth and the black line along each side. At first taken to 
be Pterodiscus levis, but found to fall within the generic boundaries of Gasteropelecus ; 
also differing apparently in the lesser extent of the black outline of the venter. 
When taken in the dipnet swimming beneath the surface, this black line acted as a 
ruptive marking, giving the fish the appearance of a long, slender, minnow-like 
form. It was a matter of surprise when it was brought up and the rest of the fish 
below the line came into view. 
Head 3.3; depth 1.75; eye equals snout to end of chin, 4 in the head, 1.4 in the 
interorbital space, nearly equals gape; mouth superior, directed obliquely backward 
at premaxillaries, thence deflected vertically downward; mandible moderately long 
and deeply convex along the outside. 
Premaxillary teeth uniform, a series of seven or eight on each side, each tooth 
of moderate size, and each with a pointed central, and two pointed lateral, cusps; 
a single external maxillary tooth at the level of the pupil, hooked and conical in 
shape; a series of about five similar tricuspid teeth on each ramus of the mandible 
adjacent to symphysis. Premaxillary pointed and jutting to form a thin, obtusely 
angulate snout; head flattened dorsally from level of nares to end of occipital; crown 
bordered on each side by a slightly elevated ridge tangent to the orbit; a median 
third ridge ascends and broadens from the level of the nares to a nodular apex at the 
level of the posterior margin of the eye, thence descending and narrowing to the 
sinuously truncate occipital border; anterior naris partly encircled by the posterior. 
Dorsal fin low and short, 11-12 rays, and directed strongly backward, notched 
into the dorsal contour of the body; adipose present, weak and feebly rayed, more 
in the nature of a second dorsal; caudal strongly lobed, the ventral lobe slightly 
