50 PROCEEDINGS OF THE NATIONAL MUSEUM 



Remarks. — As noted above under Poecilobrycon unij 

 Hoedeman (1950) confused unifasciatus and eques. However, as the 

 two descriptions presented here show, these two names are appHed to 

 quite distinct species. As noted on page 28, under the remarks about 

 Nannostomus trifasciatus, Eigenmann (1909 and 1912) was apparently 

 confused in regard to the identity of Steindachner's trifasciatus and 

 eques. This probably led to the description of auratus, a synonym of 

 eques. In any event, comparisons of specimens of eques (including 

 those described as auratus) from British Guiana, widely separated 

 parts of the Amazon and Rio Negro Basins, and from the headwaters 

 of the Rio Orinoco, show that this species is remarkably constant in 

 its color pattern throughout its range, more so than any other mdely 

 distributed nannostominan. 



Specimens examined. — One, SU 36898, SL 31.0 mm., Peru, Pevas [Pebas] 

 District, Shansho Cano, Sept. 20, 1936, W. G. Scherer.— Two, SU 50236, SL 23.0- 

 33.5 mm., Peru, Rio Ampiyacu, near P6vas [Pebas], Aug. 16, 1940, W. G. Scherer. 

 —Four, SU 50237, SL 21.8-27.0 mm., Peru, Pevas [Pebas], 1940, W. G. Scherer.— 

 Two, SU 50226, SL 26.2 mm., Peru, Yaguasyacu, July 7, 1941, W. G. Scherer.— 

 Five, SU 50229, plus two alizarin preparations SU 50247, SL 28.4-30.5 mm., 

 Brazil, State of Amazonas, Sao Gabriel, Rio Negro, rock pools below rapids, 

 Feb. 1, 1925, Carl Ternetz.— One, SU 50227, SL 29.2 mm., Venezuela, mouth 

 of the Casiquiare, Feb. 24, 1925, Carl Ternetz.— Two, SU 50228, SL 31.5-32.9 

 mm., Venezuela, Cano de Quiribana, near Caicara, May 2, 1925, Carl Ternetz. — 

 One, SU 50233, SL 31.4 mm., Brazil, State of Pard, Igarapd do Sapucua into 

 Lagoa Sapucua (this lake drains into the Rio Trombetas, a tributary of the Amazon 

 River), June 7, 1924, Carl Ternetz.— Tliree, SU 50230, SL 25.4-25.7 mm., Brazil, 

 State of Pard,, Cabeceira Maturaca into Lagoa Grande, Nov. 1924, Carl Ternetz. — 

 Four, SU 50231, SL 24.3-25.0 mm., Brazil, State of Amazonas, Igarape do Mai 

 Joana, into Rio Negro near Mandos, Dec. 25, 1924, Carl Ternetz. — Three, SU 

 50232, SL 26.5-26.6 mm., Brazil, "Pard, Juntil lago Jard," Apr. 4, 1924, Carl 

 Ternetz.— Six, MCZ 6312, SL 23.5-27.5 mm., Brazil, State of Amazonas, Lake 

 Hyanuary, near Mandos, Oct. 28, 1865, Thayer Expedition, Louis Agassiz. — 

 Three, MCZ 19473, SL 21.5-24.4 mm., Brazil, State of Amazonas, Villa Bella, 

 1865-1866, Thayer Expedition, Louis Agassiz.— Two, MCZ 19594, SL 24.0-24.5 

 mm., Brazil, State of Amazonas, region of Tabatinga, Sept. 20 to Oct. 20, 1865, 

 Thayer, Expedition, Bourget.— Four, MCZ 19714, SL 24.6-28.5 mm., Brazil, 

 State of Amazonas, Lagoa, Saracd, Silves, near Serpa (Itacutiara), 1865-1866, 

 Thayer Expedition, Stephen Van Renssalaer.— Two, MCZ 19861, SL 21.0- 

 21.5 mm., Brazil, State of Pard, Santarem, 1865-1866, Thayer Expedition, 

 Bourget.— Seven, MCZ, 19646, SL 17.5-27.4 mm., Brazil, State of Pard, Obidos, 

 1865-1866, Thayer Expedition, Col. Bentos.— One, MCZ 19765, SL 27.4 mm., 

 Brazil, State of Amazonas, Lake Hyanuary, near Mandos, 1865-1866, Thayer 

 Expedition, M. Navez.— Thirteen, MCZ 19965, SL 24.0-27.5 mm., Brazil, State 

 of Amazonas, Codajdz, 1865-1866, Thayer Expedition, Bourget. — Four, MCZ 

 19978, SL 25.4-30.5 mm., Brazil, Juturana, 1865-1866, Thayer Expedition.— 

 Two, MCZ 19998, SL 25.7-27.0 mm., Brazil, Curupira, 1865 or 1866, Thayer 

 Expedition, Major Coutinho.— One, SU 21964, SL 24.4 mm., and four CAS(IUM) 

 11688, SL 21.6-25.5 mm., British Guiana, Konawaruk, Essequibo River, 1908, 

 Carl H. Eigenmann.— Three, CAS(IUM) 11690, SL 24.9-27.0 mm., British 

 Guiana, Essequibo River at Rockstone, 1908, C. H. Eigenmann. — Five, 



