288 FISHES OF WESTERN SOUTH AMERICA 
Type: Poecilobrycon harrisont Eigenmann 
British Guiana and Amazons 
Skull truncate, without either crest or fontanel; lateral line wanting; teeth 
broadly tipped and five-pointed. 
377. POECILOBRYCON EQUES (Steindachner) 
Nannostomus eques Steindachner, 1876, Sitzb. Kix. Akad. Wiss. Wien, LX XIV, 78, fig. 3. 
Poecilobrycon eques Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 427. 
Peruvian Amazon 
Genus 156: CHARACIDIUM Reinhardt 
Characidium Reinhardt, 1866, Overs. Dansk. Forh. Kjébenhavn, 56, pl. 11, figs. 1 and 2; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 427; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 288. 
Chorimycterus Cope, 1894, Amer. Nat., XLVIII, 67, tenwis. 
Nanognathus Boulenger, 1895, Boll. Mus. Zool. Torino, X, 196, 3, borellz. 
Poecilosomatops Fowler, 1906 (1907), Proc. Acad. Nat. Sci. Phila., LXNVITI, 323, Characidium ethe- 
ostoma. 
Type: Characidium fasciatum Reinhardt 
Orinoco and Guianas southward to Sao Francisco and La Plata 
Premaxillary and dentary each bearing a single series of conical or tritubercu- 
late teeth; no frontal fontanel, a small, circular occipital fontanel; triangular ocei- 
pital process; adipose fin present; complete lateral line. 
378. CHARACIDIUM FASCIATUM Reinhardt 
Characidium fasciatum Reinhardt, 1866, Overs. Dansk. Forh. Kjébenhavn, 56, pl. ii, figs. 1 and 2; 
Steindachner, 1882, Sitzb. KIx., Akad. Wiss. Wien, LX XXII, 19, Canelos; 
Boulenger, 1887, Proc. Zool. Soc. London, 280, Sarayacu, four; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 427. 
Orinoco basin southward to La Plata 
379. CHARACIDIUM ETHEOSTOMA Cope 
Characidium etheostoma Cope, 1871 (1872), Proc. Acad. Nat. Sci. Phila., XXIII, 259, pl. xin, fig. 3, 
R. Ambyiacu, Hauxwell; 
Higenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 427. 
Characidium (Poecilosomatops) etheostoma Fowler, 1906 (1907), Proce. Acad. Nat. Sei. Phila., LX-VITT, 
O2omiiomlise 
Rio Ambyiacu 
380. CHARACIDIUM STEINDACHNERI Cope 
Characidium steindachneri Cope, 1878, Proc. Amer. Phil. Soc., XVII, 688, Peruvian Amazon, Orton 
collection; 
