ANNOTATED LIST OF THE SPECIES 111 
Genus 20: SCIADES Miller and Troschel 
Sciades Miller and Troschel, 1849, Horae Iechth., III, 8, sp; 
Bleeker, 1858, Ichth. Arch. Ind. Siluri, 62 and 66, pictus; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 190; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 390. 
Type: Bbagrus pictus Miller and Troschel 
The Amazons 
Differentiated from other genera chiefly by the longer dorsal fin with its 10 or 
11 rays; and by the smaller patches of palatine teeth remote from the yvomerine 
and transversely arranged. 
53. SCIADES MARMORATUsS Gill 
Sciades marmoratus Gill, 1870, Proc. Acad. Nat. Sci. Phila., XXII, 95, Napo or Maranon basin; 
Eigenmann and Kigenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 192; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 390. 
Known from specimens taken at Tabatinga and upstream. 
Genus 21: BRACHYPLATYSTOMA Bleeker 
Platystoma Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, sp., preoccupied in Diptera; 
Brachyplatystoma Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 97, vacllantz; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 194; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 390; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 179. 
Type: Platystoma vaillanti Cuvier and Valenciennes 
Amazonia to Guiana and Parahyba 
Distinguished from other Pimelodinae by the long, slender, depressible pre- 
maxillary teeth; vomerine and palatine teeth villiform; caudal forked deeply; head 
naked; occipital process short, indistinct, and not reaching the dorsal fin in the 
adult. 
54. BRACHYPLATYSTOMA JURUENSE (Boulenger) 
Plate IV, fig. 1 
Platystoma juruense Boulenger, 1898, Trans. Zool. Soe. London, XIV, 421, pl. xxxix, Rio Jurua. 
Brachyplatystoma juruense Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 390. 
Rio Jurua and Iquitos 
15953, 1, 286 mm. to base of middle caudal rays, Iquitos, Morris, 1922. 
Head 4; depth 5.33; D. I, 6; A. 5. 
Head depressed, profile to base of occipital process straight, the process not 
nearly reaching dorsal plate; anterior margin of eye near center of the head; eye 8 
in snout, 16 in length of head, 4.5 in interorbital; maxillary barbel flat, reaching to 
