236 PROCEEiDINGS OF THE NATIONAL MUSEUM * vol. 94 



CALLOPHYSUS MACROPTERUS (Lichtenstein) I 



Zamurito 



Pimelodus macropteriis Lichtenstein, Wiedemann's Zool. Mag., vol. 1, pt. 3, 



p. 59, 1819 (Brazil). 

 Callophysus macropterus Peters, Monatsb. Akad. Wiss. Berlin, 1877, p. 470 



(Apure River, Venezuela). 



Family AUCHENIPTERIDAE 



KEY TO THE GENERA OF AUCHENIPTERIDAE REPORTED FROM VENEZUELA 



la. Anal base long, of 16 to 40 branched rays; pectoral spine pungent, pectoral 



raj's usually I, 7; postcleithral process a triangular, broad-based, spiny 



projection. 



2a. Teeth villiform in a band on premaxillaries and on dentaries, no teeth on 



palatines. 



3a. Pelvic rays i, 5; caudal fin truncate or a little concave; anterior or outer 



margin of pectoral spine serrated distally, the teeth antrorse; bases of 



anterior pair of mental barbels far in advance of bases of posterior 



ones; lower jaw a little longer than upper jaw-.Trachycorystes Bleeker 



35. Pelvic rays i, 7; caudal fin forked; anterior margin of pectoral spine 



smooth, not serrated; bases of anterior pair of mental barbels in front 



of bases of posterior ones Pseudauchenipterus Bleeker 



2b. Upper jaw sharp-edged, with a single scries of teeth along edge, lower jaw 

 with about 2 series of teeth in front, a single series on side; pectoral spine 

 with spines on anterior and posterior sides; caudal fin forked; adipose 

 fin short; dorsal and pectoral spine pungent. -Entomocorus Eigenmann 

 16. Anal base short, of about 7 to 11 rays; adipose fin base shorter than anal fin 

 base; pelvic rays i, 5 and pectoral about i, 5; postcleithral process a narrow- 

 based spiny projection; dorsal surface of head covered by a wide bony 

 plate with lateral wings opposite dorsal origin, this plate formed by ex- 

 panded supraoccipital process fused with dorsal plate; caudal fin forked. 



Centromochlus Kner 



Genus TRACHYCORYSTES Bleeker 



Trachycorystes Bleeker, Act. Soc. Sci. Ind.-Med., vol. 4, p. 200, 1857-58. (Type, 

 Trachycorystes typus Bleeker.) 



KEY TO THE SPECIES OF TRACHYCORYSTES REPORTED FROM VENEZUELA 



la. Least depth of caudal peduncle 2.2 to 2.7 in length of anal base and 1.6 to 



2.0 in pectoral spine; caudal fin slightly concave; anal rays iii, 23 to iii, 25. 



Trachycorystes insignis peloichthys, new subspecies 



16. Least depth of caudal peduncle 1.5 to 1.9 in length of anal base and 1.2 to 1.4 

 in pectoral spine; caudal fin truncate or a trifle rounded; anal rays iii, 24 in a 

 specimen from British Guiana Trachycorystes galeatus (Linnaeus) 



TRACHYCORYSTES INSIGNIS PELOICHTHYS. new subspecies 



Plate 4, A 



Holotype. — U.S.N.M. No. 121281, a specimen 160 mm. in standard 

 length, collected by Leonard P. Schultz, May 1, 1942, in the Eio 

 Agua Calicnte, 2 to 3 km. above Lago Maracaibo, Venezuela. 



Paratypes.—U.S.l^i.M. No. 121282, 4 specimens, 133 to 160 ram. in 



