256 SILUR1DJE. 



3. Loricaria lseviuscula. 

 Cuv. Sf Val. xv. p. 476 ; Kner, Loricar. p. 17. taf. 3 (taf. 1, skeleton). 



Snout broad, of moderate length ; orbit of moderate size, with a 

 shallow notch in its posterior margin ; the width of the interorbital 

 space is less than the horizontal diameter of the eye. Small teeth, 

 subequal in size, in both jaws. The labial fold is very broad, with 

 numerous small papilla? and short marginal fringes. The lower side 

 of the head naked ; scutes of the head and nape smooth. L. lat. 28. 

 There are from five to seven lateral scutes between the pectoral and 

 ventral fins. Belly and hinder part of the thorax with numerous 

 small, irregular scutes. The origin of the dorsal fin is a little behind 

 the vertical from the base of the ventrals. The upper caudal ray not 

 prolonged. Fins with black dots ; head and body with small brown 

 dots. 



Northern Brazil. 



a-b. Fine specimens. River Capin. Purchased of Mr. Stevens. 



4. Loricaria vetula. 



Valenc. in a" Orb. Voy. Atner. Merid. Poiss. pi. 6. fig. 2 ; Cuv. fy Val. xv. 

 p. 466. 



Snout broad, of moderate length ; eye of moderate size, its diameter 

 being rather less than one-half of the width of the interorbital space ; 

 orbit without notch behind. Teeth in both jaws. The labial fold is 

 very broad, with papillae and fringes. Scutes of the nape keeled. 

 Thorax and belly with numerous small, irregular scutes. The length 

 of the outer pectoral ray is one-fourth of the total (without caudal 

 filament) ; the upper caudal ray produced into a long filament. 

 Fins with brown dots. ( Val.) 



Rio de la Plata. 



5. Loricaria nudiventris. 

 Cuv. 8/ Val, xv. p. 469. 

 Snout broad ; the width between the pectoral fins is one-fifth of 

 the total length ; the diameter of the eye is one -half of the width of 

 the interorbital space ; orbit with scarcely any notch behind. Teeth 

 in both jaws. The scutes of the nape keeled. The lower part of the 

 thorax and the belly are naked to between the ventral fins ; there are 

 four lateral scutes between the pectoral and ventral fins. ( Val.) 

 Rio San Francisco. 



** Snout long and narrow, without bristles. 



6. Loricaria rostrata. 



Spix, Pise. 2?ras. p. 5. tab. 3. figs. 1 & 2 ; Kner, Loricar. p. 19. 



Snout long and narrow, the greatest width of the head being about 



one-half of its length. Eye small, its diameter being less than one-half 



of the width of the interorbital space ; orbit without notch behind. 



Teeth fine, slender, in both jaws. Labial fold short, not fringed. 



