92 FISHES OF WESTERN SOUTH AMERICA 
1.33 in its length; eye about equal to the interorbital width; head slightly convex; 
tail compressed; tip of the occipital crest nearer the origin of the dorsal than the 
tip of the snout; anterior nostril much nearer the snout than to the posterior nostril; 
mouth subterminal, the upper jaw slightly the longer; depth of the premaxillary 
band of teeth 2 times in its length; maxillary barbels extending slightly beyond the 
origin of the ventrals, outer mentals to the base of the pectorals, inner mentals to 
the gill opening; distance of the dorsal from the tip of the snout 2.6 times in the 
length; origin of the ventrals below the second dorsal ray; origin of the anal poste- 
rior to the origin of the adipose; adipose fin 3.5 in the length; caudal rather deeply 
forked, the upper lobe the longer, considerably longer than the head. 
Brownish, a dark humeral spot, otherwise unmarked. 
Genus 9: NANNOGLANIS Boulenger 
Nannoglanis Boulenger, 1887, Proc. Zool. Soc. London, 278, pl. xxi, fig. 3, Canelos; 
EKigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 146; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 385. 
Type: Nannoglanis fasciatus Boulenger 
Eastern Ecuador to southeastern Brazil 
Anal short, having only 8 rays; dorsal entirely behind the vertical from the 
ventrals; dorsal lacking a pungent spine; fontanel continued to the base of the 
occipital process which does not reach the dorsal plate; head longer than broad, 
but not produced into an elongated snout; vomer and palatine edentulous; narial 
barbels wanting; eye superior; head enclosed in skin; adipose large, caudal truncate. 
18. NANNOGLANIS FAScIATUS Boulenger 
Nannoglanis fasciatus Boulenger, 1887, Proc. Zool. Soc. London, 278, pl. xxi, fig. 3, Canelos; 
Eigenmann and Eigenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 147; 
tJ Sa 
Higenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 385. 
Eastern slopes of Ecuador, piedmont zone 
Genus 10: RHAMDIA Bleeker 
Pimelodus Lacépéde, 1803, Hist. Nat. Poiss., V, sp.; 
Cuvier, 1817, Régne Animal, II, 203, sp.; 
Ginther, 1864, Cat. Fish. Brit. Mus., V, sp. 
Rhamdia Bleeker, 1858, Iechth. Arch. Ind. Siluri, I, 197, 207, sp; 
Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 101, quelenz; 
Eigenmann and Higenmann, 1890, Occ. Papers Cal. Acad. Sci, I, 116; 
ERigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, HI, 385. 
Type: Pimelodus quelen Quoy and Gaimard 
Mexico to La Plata and Peru 
Fontanel terminating at the eye level; occipital process not reaching dorsal 
plate; top of head enclosed in skin, not granulated; head longer than broad, snout 
