SOUTH AMERICAN NEMATOGNATHI. 39 



35. Loricaria konopickyi Steindaclmer. 



L. viaculata Val.; L. vaUnciennesi Vaillant. 



36. Loricaria lanceolata GUntber. 



37. Loricaria teffeana Steindacbner. 



Localities: Cudajas; Touautins; Teffe; Jutahy; Lago Alexo; Taba- 

 tinga. 



IV. Harttia Steindacbner. 



38. Harttia loricariformis Steindacbner. 



Localities: Rio Parabyba; Itabapuana; Muriabe. 



Y. OxYEOPSis gen. no v. 



Type, Oxyrojysis wrightiana sp. no v. 



This genus diflfers from Harttia as Hypoptopoma differs 

 from Otocinclus. 



The head is depressed, the eyes marginal, the orbit in- 

 fringing slightly on the lower surface of the head. Tail de- 

 pressed. A lateral keel. Belly covered with granular 

 plates. Adipose fin none. 



39. Oxyropsis wrightiana sp. no v. 



Type, No. 8055; one specimen, .037 m. to base of caudal. Lake- 

 Hyanuary. L. Agassiz. 



Depressed, elongate, the depth about 2 in the width. 

 Head depressed, the snout rounded; occipital margined by 

 two nuchal plates; interorbital convex; nares above the an- 

 terior margin of the orbit. Surface of the head and all the 

 scutes with longitudinal series of small spines; no keels on 

 the head. Lower surface of the head as in Hypoptopoma. 



Eye 2 J in the snout, 5^ in the head, 2| in the interorbi- 

 tal. 



Teeth well developed; lower lip convex, papillose. 



Anal groove bounded laterally and posteriorly by a horse- 

 shoe-shaped plate, anteriorly by the large shield-shaped 

 anal plate. Belly with three series of plates which are sep- 

 arated anteriorly; thorax with two pairs of large plates. 

 Four series of plates cover the entire body. The lateral 



