400 CALIFORNIA ACADEMY OF SCIENCES. 



wiinv. Caudal with two series of spots between each two rays. 



Eye nearly ^ of the interorbital; first dorsal ray longer than the 



head; caudal obliquely subtruncate; pectoral spine with long, 



curved spines; head 3|. (Gtinther). brevicauda 365. 



vi\ Occipital bordered by a single nuchal plate. 



X. A single series of large round spots between two dorsal rays, 

 similar spots on the caudal; scutes of the belly reduced to a 

 minimum; snout more regularly convex in transverse profile 

 than in wuchereri, Lat. 1. 26. rohinii 366. 



XX. Two series of spots between two dorsal rays, the spots much 

 smaller than the eye; upper caudal lobe little shorter than the 

 lower; space between and behind ventrals naked, or with few 

 granules. Lat. 1. 26. ivuchereri 367. 



XXX. Spots on the caudal much smaller than those on the dorsal, 

 which are large and ill-defined; caudal very obliqiiely truncate, 

 the lower lobe being much the longer; space beeween and be- 

 hind the ventrals mostly granular. Lat. 1. 25. johnii 368. 



344. Flecostomus emarginatus. 



Hypostomus emarfjinatiis Cuvier & Valenciennes, xv, 500, 1840 



(Brazil). 

 Hi/po'.itomus emar(jinatns Kuer, Hypostomiden, 260, 1853 (Barra do 



Eio Negro), not Cuv. & Val. 

 Flecostomus emarginatus Gtinther, v, 233, 1864 (copied); Eigenm. 



& Eigenm. Proc. Cal. Acad. 2d Ser. i, 167, 1888 (Cudajas; San- 



tarem; Manacapuru; Tonantins; Obidos; Fonteboa; Tabatinga; 



Hyavary; Sao Paolo; Goyaz). 

 Hypostomus horridus Kner, Hypostomiden, 259, pi. i, fig. 1, 1853 



(Rio Guapore). 

 Flecostomus horridus Gtinther, Cat. Fish. Brit. Mus. v, 232, 1864 



(copied); Peters, MB. Ak. Berl. 1877, 471 (Calabozo). 

 Hypost07nus sqtiaUnum Schomburgk, Fish. Brit. Guiana, 142, pi. 2, 



1841 (Rio Branco, Rio Negro and Eio Essequibo). 

 Flecostomus scopularius Cope, Proc. Acad. Nat. Sci. Philad. 1871, 



55 and 286, pi. 16, figs. 1 and 2 (Ambyiacu). 

 Flecostomus tenuicauda Steindachner, Fisch-fauna Magd. Stromes, 



24, pi. vii, 1878 (Magdalen River); id. Fisch-fauna des Caucaand 



Fltisse bei Guayaquil, 11, 1879 (Cauca). 

 Habitat: Amazons and tributaries from Para to Ambyiaca; Guiana 



region; Rio Magdalena. 



H. emarginatus C. & V. was based on a dried speci- 

 men .51 m. long. The age and condition of the individ- 

 ual most likely prevented the discovery of the small 

 plates on the side of the occipital process, which therefore 



