eigenmann: fresh water fishes. 249 



Pygidinm inacrcei Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. 2d 

 sen, II, 51, 1889 (Uspullatuo) ; id.. South Am. Nematognathi 328, 

 1890 (Uspullatuo). 



Elongate, rather compressd, especially backward. Head as broad as 

 long, snout rounded; eye" small, midway between tip of snout and end 

 of opercle ; none of the barbels' reaching the gill-opening. 



Gill-opening scarcely continued forward, joined to the isthmus for a 

 distance equal to half the width of the mouth. 



Pectorals obliquely truncate, the first ray not produced ; origin of dor- 

 sal some distance behind ventrals, equidistant from occiput and tip of 

 caudal ; fourth or fifth dorsal ray highest, then gradually decreasing in 

 height to the last. Caudal emarginate, the upper lobe pointed, the lower 

 rounded ; anal inserted below the 9th dorsal ray and terminating under 

 the 17th ; ventrals inserted nearer tip of snout than to tips of middle cau- 

 dal rays, reaching to the vent. Head 63- (7 in the total) ; depth 6 ; D. 21. 

 A. 10. 



This account is drawn from a specimen (No. 8298) in the Museum of 

 Comparative Zoology. It came from Uspullatuo and is probably the type 

 of the species. 



II. Hatcheria maculata (Cuvier & Valenciennes). 



(Plate XXXIII, Figs, i, \a and i^.) 



Triclwniycteyiis maculatus Cuvier & Valenciennes, Hist. Nat. Poiss., 

 XVIII, 493, 1846 (Santiago) ; Guichenot in Gay, Hist. Chile Zool., 

 II, 311, 1848 (Chili) ; Giinther, Cat. Fish. Brit. Mus. V, 273, 1864; 

 Girard, Proc. Acad. Nat. Sci. Phila., VII, 1854, 199 (Mapocho) ; Phil- 

 ippi, Mb. Akad. Wiss. Berl. 1866, 716; Delfin, Catalogo de los 

 Pesces de Chile, 30, 1901. 

 Thrichoniycterits maculatus Girard, in part, U. S. Naval and Astronomical 



Expedition 243, 1855 (Rio Mapocho). 

 Pygidiinn macnlatiini Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. 

 2d sen, II, 51, 1889 (Rio Mapocho) ; id., South Am. Nematognathi 

 329, 1890 (Rio Mapocho). 

 Elongate, somewhat compressed ; head as long as wide ; caudal pe- 

 duncle long and slender. Eye small, midway between tip of snout and end 

 of opercle. Lips and lower surfaces of the head thickly covered with 



