200 FISHES OF WESTERN SOUTH AMERICA 
Genus 85: HYPOPTOPOMA Giinther 
Hypoptopoma Gimther, 1868, Proc. Zool. Soc. London, 234, 
Eigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 388; 
Regan, 1904, Trans. Zool. Soc. London, XVII, 263; 
Bigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 412. 
Type: Hypoptopoma thoracatum Gimther 
Upper Amazons 
Snout low, spatulate, somewhat movable; eyes lateral, as visible from below 
as above; teeth slender, bifid; adipose reduced to a vestigial spine; a dermal ossi- 
fication of the clavicle and coracoid bones forming two pairs of granular plates. 
200. HypopropoMA GULARE Cope 
Hypoptopoma gulare Cope, 1878, Proc. Amer. Phil. Soc., XVII, 679; 
Kigenmann and Eigenmann, 1889, Proc. Cal. Acad. Sci., (2), I, 40; 
Eigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 390; 
Regan, 1904, Trans. Zool. Soe. London, XVII, 265; 
Figenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITI, 412. 
The Maranon 
201. HyporpropoMaA THORACATUM Ginther 
Hypoptopoma thoracatum Ginther, 1868, Proc. Zool. Soc. London, 234, fig. 2, one specimen, Xeberos; 
Eigenmann and Eigenmann, 1889, Proc. Cal. Acad. Sei., (2), II, 40; 
FKigenmann and EKigenmann, 1890, Occ. Papers Cal. Acad. Sci., 1, 388; 
Regan, 1904, Trans. Zool. Soc. London, XVII, 263, upper Amazon; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 412. 
Hypoptopoma bilobatum Cope, 1870, Proc. Amer. Phil. Soc., XI, 566, two text figs., Pebas; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 679, Pebas; 
Steindachner, 1882 (1883), Denksch. KIx. Akad. Wiss. Wien, XLVI, 7, Rio Huallaga, one 
specimen. 
Upper Amazon northward 
15737, 3, 51-59 mm., to end of middle caudal rays, mouth of Rio Pacaya, Allen, August, 1920. 
202. HyporpropoMA JOBERTI (Vaillant) 
Otocinclus joberti Vaillant, 1880, Bull. Soc. Philom., (7), IV, 147; 
FKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 412. 
Hypoptopoma joberti Regan, 1904, Trans. Zool. Soc. London, XVII, 265. 
Hypoptopoma thoracatum (in part), Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., 
I, 389. 
Rio Juruad and Solimoes to the Ucayali 
15738, 1, 65 mm. to end of middle caudal rays, mouth of Rio Pacaya, Allen, August, 1920. 
15401, 1, 88 mm., Lago Cashiboya, Allen, August, 1920. 
