SOUTH AMERICAN NEMATOGNATHI. 365 



yy. Width at origin of anal equal to snout and orbit; 

 width of head greater than its length to upper angle of 

 gill-opening; posterior half of occipital with two indis- 

 tinct keels. lata 327. 

 xx. Barbels extending beyond base of pectoral; margin of 

 snout concave; small teeth in both jaws; horizontal diame- 

 eter of eye not quite equal to interorbital; lateral keels ap- 

 proximated on the 18th scute; thorax and belly with 

 small scutella; upper caudal ray produced. (Giinther.) 



macromystax 328. 



ww. Orbit without a notch; eye 5 in the snout, 9 in the head; 

 dorsal, pectoral and ventral spotted. (Cuv. & Val.) 



vetula 329. 



vv. Lower lip with marginal cirri only; head and body exces- 

 sively depressed, the width of the head much greater than 

 its length to upper angle of gill-opening; teeth few, minute; 

 orbit with its notch 1^ in the interorbital; occipital and nuchal 

 plates bicarinate; lateral keels prominent, approximated on 

 the 16th scute; upper caudal ray slightly produced. Olive 

 green, head with vermiculating lines, back with whitish spots, 

 Head 4f. Lat. 1. 31. (Gimther.) lamina 330. 



vvv. Lower lip papillose, without cirri; width of head about 

 equal to its length to upper angle of gill-opening; teeth very 

 numerous and fine; orbit without a notch, its diameter 1^ in 

 interorbital; scutes smooth; lateral keels obtuse, approxi- 

 mated on the 21st scute; dorsal falcate, the length of the 

 first ray greater than its distance from the snout; outer rays 

 of all fins somewhat prolonged. Head 5. Lat 1. 29. (Giin- 

 ther.) platystoma 331. 



302, Loricaria depressa. 



Hemiodondepressus~K.ner, Panzerwelse, 91, pi. vii, fig. 1 (Kio Negro; 



Marabitanos). 

 Loricaria depressa Giinther, v, 259, 1864 (copied); Eigenm. & Eigenm. 



Proc. Cal. Acad. 2d Ser. ii, 34, 1889. 

 Habitat: Rio Negro. 



This species is known only from the types. 



303, Loricaria panamensis. 



Loricaria panamensis Eigenm. & Eigenm. 1. c. (Panama.) 

 Habitat: Panama. 



Type No. 8126; one specimen .95 m. to base of caudal. 

 Panama. Dr. Hernberg. 



Closely related to L. rostrata Spix. 



Body little depressed. No keels on the head or on the 



