336 Fretp Museum or NaturaL History — Zoéxoey, Vo. X. 
anal; origin of first dorsal about midway between tip of snout and base 
of caudal, the first spine equal to or shorter than the second, not longer 
than eye and snout; origin of second dorsal notably nearer origin of first 
dorsal than base of caudal, margin of fin concave; caudal fin with small 
scales on basal half, moderately forked; anal fin similar to second dorsal 
but a little longer, with 2 spines, the first one minute and often hidden in 
the skin, its origin under or slightly in advance of second dorsal, midway 
between base of ventrals and base of caudal; ventral fins inserted under 
middle of pectoral, somewhat nearer origin of anal than tip of snout; 
pectoral fins placed high, of about the same length as the ventrals, 1.4 
to 1.65 in head. / 
Color bluish black above; sides silvery, with margin of scales brown; 
pale below. An indefinite dark lateral streak, with a silvery one above 
it, most evident on posterior part of body; a dark caudal spot present. 
Spines of first dorsal black, the membranes greenish; second dorsal, 
caudal and distal half of anal dusky; ventrals and pectorals plain in 
spirits, except that the upper ray of pectoral is black. 
There are only 2 specimens of this species in the present collection, 
respectively 173 and 205 mm. inlength. Both specimens were taken at 
the base of a waterfall near the mouth of the Rio Indio, a tributary of 
the Upper Chagres. 
This species differs from the preceding principally in the somewhat 
deeper body and in the notably larger mouth. 
Habitat: Rio Guacalate, Guatemala; Rio Chagres, Panama. 
44. Genus Joturus Poey. 
Joturus Poey, Memorias, II, 1861, 263 (type Joturus pichardi Poey). 
Xenorhynchichthys Regan, Ann. & Mag. Nat. Hist., Ser. 8, II, 1908, 461 
(type Joturus stipes Jordan & Gilbert). 
Snout protruding beyond upper lip; teeth.in lower jaw in two lateral 
patches which do not meet anteriorly; dorsal spines compressed. In 
other respects essentially as in Agonostomus. One species known, living 
at the foot of waterfalls and rapids. 
71. Joturus pichardi Poey. 
Joturus pichardi Poey, Memorias II, 1861, 263 (Cascades throughout 
Cuba); Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 1896, 
821; Regan, Biol. Cent. Amer., Pisces, 1907, 70; Meek, Field Mus. 
Nat. Hist. Pub., Zodl. Ser., X, 1914, 117 (both slopes of Costa Rica). 
Agonostoma globiceps Giinther, Ann. & Mag. Nat. Hist., Ser. 4, XIV, 
1874, 370 (Myzantla, Vera Cruz). 
Se ee 
