212 FISHES OF WESTERN SOUTH AMERICA 
Head 5.0—-5.33; depth 8.0-8.5, about equal to preorbital; D. I, 7; A. I, 5; 
scutes 17 or 18 —- 17 or 18, the keels entirely coalesced on the 17th or 18th scute; 
width of head 1.2 in its length; eye minute, about 12 in the head, 3 in interorbital; 
interorbital 4 in the head, snout 1.75; snout parabolic, with scarcely perceptible 
median ridge; the orbital margins not raised; scutes not carinate; lower surface 
of the head covered with small scales except where covered by the papillose lips; 
barbel short; belly entirely covered with 5-10 small plates between the lateral 
series; a single plate in front of the anus, a pair of them on the sides and behind; 
width at the 17th scute equal to snout and eye or a little wider. 
Fins medium to large, the dorsal spine not equal to its distance from the snout, 
not prolonged in a filament; the outer caudal rays prolonged, the upper much 
longer (310 mm.) than the lower (85 mm.) in the specimen 150 mm. long; one or 
the other of the filaments is broken in the remaining specimens. First pectoral 
rays extending to or beyond the origin of the caudal; ventrals reaching to the 
middle or the end of the base of the anal. 
Dusky; outer rays and ends of middle caudal rays light, the lobes of the 
caudal black; a pair of light spots at the bases continuous or not with the light 
margin of the middle rays; other fins uniform dark, the outer rays lighter. 
232. HARTTIA BREVIROSTRIS (Higenmann and Eigenmann) 
Loricaria brevirostris Kigenmann and EKigenmann, 1889, Proc. Cal. Acad. Sei., (2), I, 35; 
Bigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 367. 
Oxyloricaria brevirostris Regan, 1904, Trans. Zool. Soc. London, XVII, 299. 
Harttia brevirostris Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 415. 
“Tca”’, Peru, probably a finca 
The type alone known, 210 mm. to end of caudal, collector W. James. 
Genus 90: STURISOMA Swainson 
Sturisoma Swainson, 1838, Fish. Amph. Rept., I, 387; II, 304; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITI, 416. 
Oxyloricaria Bleeker, 1863, Nederl. Tijdsch. Dierk., I, 80; 
Regan (in part), 1904, Trans. Zool. Soc. London, XVII, 297. 
Loricaria (in part) Eigenmann and Kigenmann, 1890, Occ. Papers Cal. Acad. Sc1., I, 366. 
Type: Loricaria rostrata Spix 
Panama to Paraguay 
Separable from other genera of Loricariinae by the strong development of 
teeth in both jaws; prolonged snout whose lower surface is granular; lateral keels 
coalescent; orbit without a notch; ventral aspect of the head with small plates; 
head without keels; anterior profile concave. 
233. STURISOMA ROSTRATUM Spix 
Loricaria rostrata Spix, 1829, Sel. Gen. et Spec. Pisc. Bras., 5, pl. iii, figs. 1 and 2, Brazil; 
Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 478; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 256; 
