SOUTH AMERICAN NEMATOGNATHI. 55 



somewhat longer than broad; snout pointed. Eye large, 

 1 in snout, 3i in head. Mouth large, upper lip witli two 

 series of teeth; intermaxillaries and mandible with four 

 series of depressible teeth, those of the inner series enlarged 

 at the tip. Lower lip not dilated, barbel shorter than the 

 eye. 



Opercle with two spines; preopercle with 5 or 6 claw-like 

 spines. 



Origin of dorsal about equidistant from tip of caudal and 

 occiput; caudal emarginate; anal placed entirely behind 

 the dorsal; origin of ventrals equidistant from bases of cau- 

 dal and pectoral. 



Light brown; entire upper surface with rather large 

 dark brown spots; a series of larger dark spots along the 

 middle line of the sides, the spots largest and most con- 

 spicuous on the tail; caudal with a few faint dark spots. 



Head5i; D. 9; A. 7. 



28. Stegophilus macrops Steiudacbner. 



29. Stegophilus insidioSUS Keinbardt. 



30. Stegophilus reinhardti Steiudacbner. 



VIII. Vandellia Cuy. & Val. 



31. Vandellia cirrhosa Cur. & Val. 



Locality: Hyavary. 



32. Vandellia plazaiiCastelnaii. 



Locality: Lake Hyanuaiy. 



IX. Pareiodon Kner. 

 Centro'pliorus Kner; Astemomyderus Guichenot. 



33. Pareiodon microps Kuer. 



Astimomyderus pusillus Guicbenot. 



X. MiuROGLANis gen. nov. 



Type, Miuroglards platycephalus sp. nov. 



Gill membrane broadly united with the isthmus, without 



