NO. 3538 CHARACID FISHES — WEITZMAN 37 



types, CAS(IUM) 11700, SL 19.5-21.8 mm., British Guiana, Gluck Island, 

 Essequibo River, 1908, Eigenmann. — One, paratype, CAS(IUM) 11701, SL 

 (damaged), British Guiana, Christianburg Canal, Demerara River, 1908, Eigen- 

 mann. — Five, paratypes, CAS(IUM) 11702 (one aHzarin preparation), SL 17.5- 

 18.0 mm., British Guiana, Cane Grove Corner, Mahaica River, 1908, Eigenmann. — 

 Thirty-two, SU 50219 (three aHzarin preparations), SL 15.0-22.8 mm., Brazil, 

 State of Par^, Lag6a Grande, Igrap6 do Meritysdl (probably Lagoa Grande do 

 Javafy about 34 miles northwest of Santar^m), Aug. 20, 1924, Carl Ternetz. — 

 Four, SU 50218, SL 16.4-19.5 mm., Brazil, State of Pard, Igrap§ Uruard, tribu- 

 tary of the Furo Maica about 10 miles southeast of Santar^m, June 26, 1924, 

 Carl Ternetz.— Two, MCZ 19645, SL 23.5-25.4 mm., Brazil, State of Pard, 

 Obidos, 1865, Col. Bentos, Thayer Expedition.— Two, SU 50217, SL 20.0- 

 22.0 mm., Brazil, State of Pard, Lagoa Grande (probably Lagoa Grande do 

 Javafy about 34 miles northwest of Santarem), a stream into Ajamurf beach, 

 July 17, 1924, Carl Ternetz.— One, SU 50555, SL 18.0 mm., Colombia, Caquetd 

 Province, swampy pond about one-fourth mile inland from Rio Orteguaza, across 

 the river and shghtly below Tres Esquinas, lat. 0°54' N. and long. 75°15' W., 

 Feb. 8, 1958, 8-10 a.m., Gen. T. D. White, Col. J. N. Reynolds, Lee Wulff, and 

 Dr. George S. Myers. — One, SU 50669, SL 16.5 mm., Colombia, Caquetd Prov- 

 ince, small stream across Rio Orteguaza from Tres Esquinas, lat. 0°45' N., long. 

 75°15' W., Feb. 13, 1958, Gen. T. D. White, Col. J. N. Reynolds, Lee Wulff and 

 Dr. George S. Myers.— Twenty-six, SU 50628, SL 16.0-22.1 mm., Colombia, 

 Caquetd Province, small forest tributaries of Rio Orteguaza on road from Tres 

 Esquinas to Solano, lat. 0°45' N., long. 75°15' W., Feb. 12, 1958, Gen. T. D. 

 White, Col. J. N. Reynolds and Lee WulflF.— Six, SU 50457, SL 18.0-18.4 mm., 

 British Guiana, Ishalton, southern Rupununi District, Rupununi River drainage, 

 tributary of Essequibo River, Dec. 12, 1957, Rosemary Lowe (McConnell). — 

 Two, SU 50445, SL 17.5-19.6 mm., British Guiana, Atkinson Field Creek, near 

 Hyde Park, tributary of Demerara River, Nov. 11, 1957, Rosemary Lowe 

 (McConnell).— Eight, SU 50451, SL 16.0-17.0 mm., British Guiana, Kumarow 

 Creek pool, tributary of Rupununi River in southern savannas, Essequibo River 

 drainage, Dec. 10, 1957, Rosemary Lowe (McConnell). — Twenty-six, SU 50452, 

 SL 16.2-18.7 mm., British Guiana, creek approximately 5 mi. south of Lumidpau, 

 southern Rupununi savannas (flows into Rupununi River), Essequibo drainage, 

 Dec. 11, 1957, Rosemary Lowe (McConnell).— Twenty-five, SU 50441, SL 15.7- 

 19.5 mm., British Guiana, Rupununi District, Nappi River and other Tacatu 

 drainage creeks, Rio Branco drainage, Sept. 20, 1957, Rosemary Lowe (McCon- 

 nell).— Five, SU 50428, SL 16.5-19.0 mm., British Guiana, Manawarin River, 

 tributary of the Moruka River about lat. 7°30' N. and long. 59°00' W., July 16, 

 1957, Rosemary Lowe (McConnell). 



Genus Poecilohrycon Eigenmann 



Poecilobrycon Eigenmann, 1909, p. 43 (type species Poecilohrycon harrisoni 



Eigenmann, 1909, by original designation). 

 Archicheir Eigenmann, 1909, p. 46 (type species Archicheir minutus Eigenmann, 



1909, by monotypy). 

 Nannobrycon Hoedeman, 1950, p. 22 (type species Nannostomus eques Steindachner, 



1876, by original designation). 



Diagnosis. — The following two characters appear unique for this 

 genus: Second infraorbital bone with a bony canal for infraorbital 

 branch of latersensory canal. In addition, snout long, 0.8 to 1.2 



