36 ME. G. A. BOULENGEE ON FISHES 



behind base of ventrals, longest rays as long as head. Anal 23-25, anterior rays 

 elongate, a little shorter than the head. Caudal bifurcate. Scales 32-33 g ; lateral 

 line reduced to 8 or 9 scales. Yellowish, with a small black humeral spot, a black 

 line along the middle of the side, and a black line along the base of the anal fin ; 

 dorsal blackish at the end. 



Total length 35 millim. 



Several specimens from Descalvados, Matto Grosso. 



Named after Prof. A. B. TJlrey, the author of a very useful key to the determination 

 of the species of this genus. 



73. Brachychalcinus eetrospina, Blgr. 

 Descalvados and San Luis, Matto Grosso. 



74. Chalcinus nematceus, Kner. 

 Asuncion, Paraguay. 



75. Chalcinus paeanensis, Gthr. 

 Descalvados and Paraguay. 



76. Gastropelecus stellatus, Kner. 

 Descalvados. 



77. Anactrtus macrolepis, Kner. 

 Descalvados. 



78. Anactrtus microlepis, Reinh. 

 Descalvados and Paraguay. 



79. Anacyetus prognathus. (Plate VIII. fig. 4.) 

 Anacyrtus prognathus, Boulenger, P. Z. S. 1895, p. 529. 



Depth of body 2f in total length, length of head 4 times. Snout strongly projecting 

 beyond the mouth, squarely truncate, with two strong tooth-like spines pointing 

 outwards and forwards, several smaller teeth on each side of the upper jaw and two on 

 each side of the lower ; diameter of eye \ length of head, 1^ in length of snout, 1 ^ in 

 interorbital width; maxillary extending to below anterior third of eye; upper profile 

 of head very concave. Dorsal 11, equally distant from eye and base of caudal, longest 

 rays a little shorter than head. Anal 52. Caudal deeply forked. Yellowish, with a 

 silvery lateral stripe ; end of snout and a small spot at base of caudal blackish. 



Total length ] 25 millim. 



A single specimen from Paraguay. 



