156 MEMOIRS OF THE CARNEGIE MUSEUM. 
27. Adontosternarchus sachsi (Peters). (Plate XXII, fig. 3.) 
Sternarchus sachsi Peters, Mb. Akad. Wiss. Berl., 1877, 473 (Apuré); Sacus, Aus 
den Llanos, Berlin, 1878, 153, fig. 279; Sacus, Unters. am Zitteraal, Leipzig, 
1881, 13 (Apuré); EIGENMANN AND EIGENMANN, Proc. U. 8. Nat. Mus., XIV, 
1891, 62. 
Sternarchogiton sachsi EIGENMANN AND Warp, Proc. Wash. Acad. Sci., VII, 1905, 
165 (Orinoco); E1GENMANN, Repts. Princeton Univ. Exp. Patagonia, III, 
1910, 448 (Orinoco). 
3199 C. M., six, 110-170 mm. San Joaquim, Sept. 5, 1909, Haseman. 
3200 C. M., fifty-one, 95-125 mm. Santarem, Dec. 12, 1909, Haseman. 
Head 8.25 to 10, greatest depth of the body 7.8 to 9.7 in the length to the 
base of the caudal; anal rays, 154, 156, 168, 170, 176, 185. 
Fic. 17. Adontosternarchus sachsi (Peters). 
Snout 3.2 to 3.5 in the head; interorbital equal to or very slightly longer than 
the snout; eye 2.75 to 3 in the snout, about 11 in the head. 
Body moderately elongate; head compressed; width of the body 3.25 to 3.75; 
depth of the head 1.3 to 1.6 in the greatest body depth; anus about the length 
of the snout behind the vertical from the eye; dorsal profile almost straight; ventral 
profile rather regularly convex. 
Snout pointed, quite short and curved downward; mouth rather small; gape 
moderate, bow-shaped and just reaching the vertical from the posterior nares; nares 
prominent, anterior about midway between the eye and tip of the snout, posterior 
not quite touching the upper anterior margin of the eye; upper jaw included, lower 
projecting very slightly and having a distinct V-shape notch in its center for the 
reception of the upper jaw, its lateral edges flare upward; scales small, larger in 
region of lateral line. 
Caudal, which is sealed for some distance out from the base, 1.8 to 2.3, pectorals 
1 to 1.4 in the head; origin of the anal on or a little in front of the vertical from the 
eill-opening. 
