Jordan and Evermann. Fishes of North America. 157 



a. Snout long and narrow, its lower surface granular. 

 HKMIOIXIN, (17/^.1, half; 6(5oi/'s, tooth): 

 b. Margin of head in both sexes granular. Teeth minute or wanting. Lateral keels 



becoming parallel, not coalescing. No keels on head or scutes before dorsal. 

 c. Teeth minute, numerous in both jaws. Lower surface of head partly naked; up- 

 per and lower caudal rays greatly produced. Scales 33. PANAMENSIS, 251. 

 STURISOMA, (slurio, sturgeon; era>/xa, body): 



bb. Margin of head in males with numerous bristles. Teeth well developed in both jaws; 



lateral keels coalescing. 

 (?. Belly with 5 series of plates. Outer caudal rays produced. Scales 34. 



ROSTRATA, 262. 



aa. Snout acute or rounded, not produced. 

 RINELORICABIA, CpiVij, rasp; Loricaria): 



t-. Margin of the head in males with numerous bristles. Teeth well developed. Upper cau- 

 dal ray greatly produced. Lips not greatly expanded and without long cirri. 

 /. Orbit notched; head naked below. 



g. Anal plato rather large, with 3 smaller plates before it; lower lip 2-lobed; 



nuchal plates each with 2 strong keels; mucous pores of anterior part of 



body black; all the fins spotted. LIMA, 253. 



gg. Anal region with small scales like those on belly; nuchal ridges very low; 



fin rays spotted. BRANSFORDI, 254. 



ee. Margin of the head in both sexes granular or hispid. 



h. Plates between ventrals large; more or less connected to form a buckler. 

 PARAHEMIODON, (n-apa, near; Hemiodon): 



i. Head longer than broad. Belly with 3 or more longitudinal series of plates. 

 j. Uppermost caudal ray spinous; lower lobe emarginate with short cirri. 

 Each jaw with 8 or 10 teeth; no keel on caudal or nuchal plates. 



URACANTHA, 255. 

 LORICARIA: 

 hh. Plates between ventrals, if present, small; no large anal plate. 



i. Belly partly nakedi the middle line aud sides armed; lower lip with numerous 

 cirri and marginal fringes; teeth few, small; an occipital keel; upper 

 surface with light and dark lines ; all fins, except anal, spotted with violet. 



VARIEGATA,256. 



Subgenus HEMIODON, Kner. 

 251. LORICARIA PANAMENSIS, Eigenmann & Eigenmann. 



Head 4i D. 8 ; A. 6 ; V. I, 5. Scales 33. Lower surface of head partly 

 naked ; no keels on the head or nape ; a large naked area about the month. 

 Orbit without notch, 4 in snout ; anterior profile concave. Belly with 5 

 series of plates. Upper caudal filament about as long as body ; first dor- 

 sal ray very high. Brownish, a blackish area in front of eye; dorsal 

 somewhat spotted ; a stripe on each lobe of caudal. Panama. (Eigen- 

 mann). 



Loricaria panamensis, EIGENMANN, S. A. Nematognathi, 365, 1890, Panama. 



Subgenus STURISOMA, Swainson. 



252. LORICARIA ROSTHATA, Spix. 



Head 4|. D. 8; A. 6. Scales 34. Body little depressed anteriorly; 

 head without keels or ridges ; its surfaces and plates evenly hispid ; nuchal 

 plates weakly bicarinate. Orbit without notch, 4 in snout, 7| in head. 

 Anterior profile very concave; the snout long and narrow; upper lip 

 granular; lower lip entire and rounded, elongate, papillose; free part of 



