ANNOTATED LIST OF THE SPECIES wal 
EKigenmann, 1888, Proc. Cal. Acad. Sci., (2), I, 164; 
Eigenmann and Eigenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 456; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 402; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 216; 
Gosline, 1940, Stanford Ichth. Bull., II, 1, 6. 
Type: Callichthys laevigatus Cuvier and Valenciennes 
Trinidad to Rio Plata and Peruvian Andes 
Coracoid process naked, the bone united to clavicle for the entire length; 
mandibular symphysis and lower lip without barbels; two at each rictus; a long 
naked area on venter; dorsal spine low and flat; pectoral spine in young serrate on 
inner margin. 
142. HopLosTERNUM LITTORALE (Hancock) 
Callichthys littoralis Hancock, 1828, Zool. Jour., IV, 244, Demarara; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 227, British Guiana; 
Steindachner, 1882, Denksch. KIX. Akad. Wiss. Wien, XLVI, 6, one, 105 mm., Rio Huallaga. 
Hoplosternum littorale Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sci., (2), I, 164, Surinam 
to Tabatinga; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 456; 
Jigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 402; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 217, pl. xxiv, fig. 1; 
Gosline, 1940, Stanford Ichth. Bull., II, 1, 8. 
Trinidad to Rio Plata and Peruvian Andes 
16136, 1, 218 mm., Iquitos, Allen, September, 1920. 
The single specimen of good size appears to belong here. The occipital 
plate reaches to the fontanel; the azygous plates, ten in number, reach the dorsal. 
143. HopLosTERNUM THORACATUM (Cuvier and Valenciennes) 
Callichthys thoracatus Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 309, pl. 443; 
Gunther, 1864, Cat. Fish. Brit. Mus., V, 228; 
Regan, 1913, Ann. Mag. Nat. Hist., (8), XII, 281, Rio Ucayali. 
Hoplosternum thoracatum Gill, 1858, Ann. Lyc. Nat. Hist. N. Y., VI, 396; 
Eigenmann and Eigenmann, 1888, Proc. Cal. Acad. Sci., (2), I, 164; 
Eigenmann and Eigenmann, 1890, Occ. Papers. Cal. Acad. Sei., I, 458; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 402; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 218, pl. xxiv, fig. 2. 
Hoplosternum thoracatum thoracatum Gosline, 1940, Stanford Ichth. Bull., II, 1, 7. 
Hoplosternum longifilis Gill, 1858, Ann. Lye. Nat. Hist. N. Y., VI, 396; 
Cope, 1878, Proc. Amer. Phil. Soc., X VII, 681, Nauta. 
Amazon northward 
15710, 2, 63-69 mm., creek, Yurimaguas, Allen, November, 1920. 
16135, 3, 143-168 mm., creek, Yurimaguas, Allen, November, 1920. 
16134, 4, 77-93 mm., brook near Rio Itaya, Iquitos, Allen, September, 1920. 
Considerable variation in form and color. 
