26 MEMOIRS OF THE CARNEGIE MUSEUM 



87. Tetragonopterus argenteus Artedi, p. 634. Lake Amucu. 4-6 in. = Tetragonopterus argen- 



teus Artedi. 



88. Tetragonopterus maculatus Miiller & Tros- Rupununi and Essequibo and the swamps and 



chel, p. 634. morasses near by. 3-4 in. = Pcecilurichthys 



bimaadatus (Linnaeus). 



89. Tetragonopterus melanurus Miiller & Tros- Upper Rupununi. 4-6 in. = Creatochanes caud- 



chel, p. 635. omacidatus Giinther. 



90. Tetragonopterus tmiiatus Jenyns, p. 635. Trenches and swamps along the coast. 1-2 in. 



= Moenkhausia oligolepis (Giinther). 



91. Chalceus angulatus Spix, p. 635. Essequibo and Rupununi. 6-8 in. = Chalceus 



rotundatus (Schomburgk). 



92. Brycon macrolepidotus Miiller & Troschel, Lower Essequibo and Mazaruni. 6-8 in. = 



p. 635. Chalceus macrolepidotus Cuvier. 



93. Brycon falcatus Miiller & Troschel, p. 635. Generally distributed, British Guiana. 6-8 in. 



= Brycon falcatus Miiller & Troschel. 



94. Brycon schomburgkii Miiller & Troschel, Plentiful in lower Essequibo. 6-7 in. = Brycon 



p. 635. falcatus Miiller & Troschel. 



95. Brycon pesu Miiller & Troschel, p. 635. Lower Essequibo and Mazaruni. 4-6 in. = 



Holobrycon pesu (Miiller & Troschel). 



96. Exodon paradoxus Troschel, p. 635. Plentiful in creeks of the upper Rupununi. 4-6 in. 



= Exodon paradoxus Troschel. 



97. Epicyrtus gibbosus Miiller & Troschel, p. Plantation drains and lower Essequibo. 4-6 in. 



= Charax gibbosus (Linnseus). 



98. Xiphoramphus falcatus Miiller & Troschel, Essequibo and Pomeroon. 6-8 in. = Acestro- 



p. 635. rhynchus falcatus (Bloch). 



99. Xiphoramphus microlepis Miiller & Tros- Pomeroon, upper Essequibo, Rupununi, and 



chel, p. 636. Takutu. = Acestrorhynchus microlepis (Miiller 



& Troschel). 



100. Hydrolycus scomberoides Miiller & Tros- Generally distributed. 2-3 ft. = Hydrolycus 



chel, p. 636. scomberoides (Cuvier). 



101. Agoniates halecinus Miiller & Troschel, p. Cuyuni. 6 in. = Agoniates halecinus Miiller & 



636. Troschel. 



102. Xiphostoma cuvieri Spix, p. 636. Upper Essequibo, Rupununi, and Takutu. 2 ft. 



= Hydrocynus cuvieri (Agassiz). 



103. Pygocentrus piraya Miiller & Troschel, p. Generally distributed in British Guiana. 10-12 in. 



636. = Pygocentrus piraya (Cuvier). 



104. Pygocentrus nigricans Miiller & Troschel, Generally distributed. 11-12 in. = Pygocentrus 



p. 636. piraya (Cuvier). 



105. Pygocentrus niger Miiller & Troschel, p. Generally distributed, British Guiana. 16-20 in. 



636. = Pygocentrus niger (Schomburgk). 



106. Pygopristis denticulatus Miiller & Troschel, Essequibo, Rupununi, Takutu, and near-by 



p. 637. swamps. = Pygopristis dentiadatus (Cuvier). 



