SOUTH AMERICAN NEMATOGNATHI. 435 



ANALYSIS OF THE SPECIES OF PSEUDANCISTRUS. 



a. Lower side of head, thorax and belly entirely naked. 



b. Color uniform brown. Eye 2 in the interorbital. barbatus 406. 



bb. A series of white dots on each interradial membrane of the dorsal; 

 the scutes with similar spots. Eye 2-J in the interorbital. 



guttatus 407. 



bbb. A. series of white dots on the dorsal and caudal rays, the mem- 

 branes immaculate; scutes with similar dots. Eye 1| in interorbital, 



depressus 408. 



bbbb. Fins yellowish with round black spots. setosus 409. 



aa. A narrow band across thorax, sides of belly and region behind ven- 

 trals covered with granular plates; a large pectoral pore. V. 6. 



wertheimeri 410. 



406. Pseudancistrus barbatus. 



Hypostomus barbalus Guv. & Val. xv, 506, 1840 (La Mana); Schom- 

 burgk, Fish. Guiana, part i, 147, 1841; Kner, Hypostomiden, 

 268, pi. ii, fig. 2 (loc.?). 



Plecostomus barbatus Giinther, v, 237, 1864 (Surinam). 



Pseudancistrus barbatus Eigenm. &Eigenm. Proc. Cal. Acad. 2d Ser. 

 ii, 45, 1889. 



Habitat: Guiana. 



407. Pseudancistrus guttatus. 



Hypostomus guttatus Cuv. & Val. xv, 508, 1840 (Surinam). 

 Plecostomus guttatus Giinther, v, 237, 1864 (British Guiana). 

 Pseudancistrus guttatus Bleeker, Silures de Suriname 10, pi. ii, fig. 



2 and pi. iii, fig, 3, 1864 (Surinam); Eigenm. & Eigenm. 1. c. 

 Habitat: Guiana. 



408. Pseudancistrus depressus. 



Chcetostomus depressus Giinther, Proc. Zool. Soc. Lond. 232, 1868 

 (? Surinam) Steindachner, Flussfische Siidam. ii, 123, pi. v, 

 fig. 1, 1881 (Surinam). 



Pseudancistrus depressus Eigenm. & Eigenm. 1. c. 



Habitat: Surinam. 



409. Pseudancistrus setosus. 



Chcetostomus setosus Boulenger, Ann. & Mag. Nat. Hist. Ser. 5, vol. 



19, 349, 1887 (Colombia). 



Pseudancistrus setosus Eigenm. & Eigenm. 1. c. 

 Habitat : Colombia . 



410. Pseudancistrus wertheimeri, 



Plecostomus wertheimeri Steindachner, SB. Ak. Wien, Iv, 1867; 

 Ichthyol. Notiz, v, 1, pi. 1, (Mucuri near Santa Clara); Stein- 

 dachner, SB. Ak. Wien, Ixxiv, 1876; Siisswasserfische siidost- 

 lichen Brasiliens, iii, 117 (Rio Mucuri near Santa Clara). 



