ANNOTATED LIST OF THE SPECIES 237 
15732, 4, 88-136 mm., Rio Huallaga, Yurimaguas, Allen, November, 1920. 
15804, 10, 79-112 mm., mouth Rio Pacaya, Allen, August, 1920. 
15861, 5, 47-120 mm., Rio Ucayali, Contamana, Allen, August, 1920. 
15862, 1, 114 mm., Puerto Bermudez, Rio Pichis, Allen, July, 1920. 
15863, 4, 100-118 mm., Iquitos, Allen, September, 1920. 
15864, 2, 86 and 105 mm., brook, Rio Itaya, Allen, September, 1920. 
15865, 64-77 mm., Lago Cashiboya, Allen, August, 1920. 
15866, 85-142 mm., Rio Pachitea, Allen, July, 1920. 
15867, 3, 106-142 mm., Rio Ucayali, Orellana, Allen, August, 1920. 
15868, 11, 65-114 mm., Yarinacocha, Allen, August, 1920. 
————, 3, 42-110! mm, Iquitos; Mornis, 11922: 
a 
Of extreme depth, 1.6-1.8 in the length; two humeral bars usually distinct, and 
at least faintly seen. Rare in the Guianas and wanting in coastal streams. 
287. TETRAGONOPTERUS CHALCEUS Agassiz 
Coregonus amboinensis Artedi, 1738, Spec. Pisc., 44. 
Tetragonopterus chalceus Agassiz, 1829, Sel. Gen. et Spec. Pisce. Bras., 70, tab. xxxiii, fig. 1; 
Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., XXII, 140; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 320; 
Cope, 1871, Proc. Acad. Nat. Sci. Phila., XXIII, 260, R. Ambyiacu; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 691, Peruvian Amazon; 
Fowler, 1906, Proc. Acad. Nat. Sci. Phila., LVIII, 440, Rio Ambyiacu, Pebas, the Hauxwell, 
Perkins, Orton collections; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 438; 
figenmann, 1912, Mem. Carnegie Mus., V, 320; 
Eigenmann, 1917, Mem. Mus. Comp. Zool., XLIII, i, 59, pl. iv, fig. 1; pl. exviii, fig. 4. 
Tetragonopterus orton Gill, 1870, Proce. Aead. Nat. Sci. Phila., X XII, 92, Napo or Maranon; 
Cope, 1870, Proc. Amer. Phil. Soc., XI, 566, Pebas; 
Cope, 1878, Proc. Amer. Phil. Soe., XVII, 691, Maranon. 
Upper Amazons to the Guianas 
Head 3.0-3.66; depth 1.66—2.0; D. III, 9; A. IV, 30 or I-IV, 36, usually 33, 
sometimes 34, developed rays; scales 8, 30 + 38, 5 (6 to anal); dusky blotch at the 
base of the caudal. 
Subfamily: STETHAPRIONINAE 
Differing from the Tetragonopterinae in the procumbent, predorsal spine; like 
them very deep and very compressiform; dorsal and ventral contours similar and 
very convex; premaxillary teeth in two series, the mandibulars in one; maxillaries 
in one series or wanting; caudal scaled; lateral line complete; ventral margin com- 
pressed to an edge; dorsal fin variously falecate; an adipose fin present; pectorals 
short; anal long. 
Genus 109: STETHAPRION Cope 
Stethaprion Cope, 1870, Proc. Amer. Phil. Soc., XI, 562; 
Steindachner, 1882 (1883), Denksch. KIx. Akad. Wiss. Wien, XLVI, 13; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 441; 
Kigenmann and Myers, 1929, Mem. Mus. Comp. Zool., XLII, v, 500. 
