202 MEMOIRS OF THE CARNEGIE MUSEUM 



AucHENiPTERUs Cuvier and Valenciennes. 

 Auchenipterus Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 207 



(michalis). 

 Evanemus Muller and Troschel, Horse Ichth., Ill, 1849, 11 (colymbetes) . 



Type, Hypophthahmis nuchalis Spix. 



Mental barbels arranged in a line near the symphysis; a short adipose fin; 

 anal long; ventrals with 12 to 15 rays; pectorals 1,11. 



Ket to the Species of Aucheniptehtis. 



a. Mandibular barbels extending to the tip of the pectoral demerarae. 



aa. Mandibular barbels extending to the lower angle of the gill-opening brevior. 



72. Auchenipterus demerarae sp. nov. (Plate XXI, fig. 1.) 



Type, 115 mm. Wismar. (Carnegie Museum Catalog of Fishes No. 1714.) 



Cotype, 115 mm. MalaU. (C. M. Cat. No. 1713.) 



Cotypes, two specimens, 101 and 118 mm. Wismar and mud-flats just below 

 Wismar. (I. U. Cat. No. 12091.) 



Similar to Auchenipterus nuchalis (Spix), but with a lateral band. 



Head 5.25; depth 4.75; D. 1,6; A. 41 to 44; V. 12; P. 1,11; eye 3 in head, 

 1.5 in interorbital, 1 in snout; depth of caudal peduncle 2 in the head. 



Head short, blunt, depressed; body much compressed; occipital process as 

 long as wide, fontanel as long as the pupil, its anterior edge but slightly in advance 

 of the posterior margin of the eye; lower jaw slightly included, the teeth in very 

 narrow bands; gill-membranes free to behind the lower margin of the pupil; maxil- 

 lary^ barbel extending to the tip of the pectoral, mandibular barbels to the middle 

 of the pectorals; distance from tip of snout to dorsal 4.33 in the length, the spine 

 equal to snout and e^^e, with a few recurved notches on the posterior margin near 

 the tip; pectoral spine but little shorter than the head, smooth in front, with 

 recurved teeth along its entire posterior margin; pectorals not reaching ventrals, 

 ventrals to about the sixth anal ray ; highest anal ray equals snout and eye ; middle 

 caudal rays about half as long as the outer. 



Sides everywhere peppered; a dark median band from the gill-opening to the 

 caudal; dorsal and caudal dusky, the tip of the upper caudal lobe sometimes quite 

 dark ; lower fins hyaline. 



73. Auchenipterus brevior sp. nov. 



Type, 71 mm. Tumatumari. (Carnegie Museum Catalogue of Fishes No. 

 1715a.) 



