270 The South American Characinidse 



VV. Scales 5-28-35, depth 2 J. A. 24- Humeral and ca,udal spot 

 present. Origin of the dorsal fin behind the ventral. The max- 

 illary extends to the front margin of the eye. Head 4. 



87. oligolepis. 

 aaaa. Anal rays 16-24.* 



W. Scales in the lateral line 38-40. A silvery-gray lateral band present, a 

 dark caudal spot elongate horizontally, fading out forward. No humeral 

 spot present. Dorsal behind the ventral. Maxillary Avith two small 

 serrated teeth. Head 4, depth 2|-2j. A. 21-23, scales 7 or 8-37 or 

 38-8 t89. mexicanus. 



AVW. Scales in the lateral line 30-35. 

 X. Maxillary without teeth. 



Y. Caudal and humeral spot generally absent. 



Z. A silvery hand present, sharply edged above with a dark band. Head 

 less than 4 in the length. Maxillary toothless. Dorsal fin a little 

 behind the ventrals. Tlie pectorals do not entirely reach the ven- 

 trals, the ventrals reach the anal. Head 3±, depth 3-3^, scales 



5-32-3 or 3J. A. 21-22 91.' copei. 



ZZ. The broad silvery band not edged above ivith dark, head more than 4 

 in the body. Maxillary toothless extending nearly to the anterior 

 border of the orbit. Anterior dorsiil and anal rays markedly 

 elongate. A. 19, head 4f, depth 31, scales 4-35-3t. 



92. diaphanus. 



YY. Caudal and humeral .spot present, the dark humeral spot sur- 

 rounded by a light-colored band. Maxillary extends to the pupil 

 of the eye. Snout short, 4 in the head. Dorsal fin Just behind the 

 ventrals, pectorals reach a little beyond the origin of the ventrals, 

 the ventral somewhat beyond the front margin of the anal. A. 

 20-22. Head 3?,, depth 3\, .scales 5-30-3 93. santaremensis. 



XX. Maxillary with teeth. 



a. Kumerons minute teeth on the maxillary Avhich extends either a little 

 or distinctly beliind the front margin of the orbit. A vertically 

 elongate humeral spot, and a longitudinal caudal stripe extending to 

 the end of the rays and fading out anteriorly. A. 15-16, head 3^-35, 



depth 3-3 J, scales 5 or 5^-33-4 or 4i 94. jenynsii. 



aa. Maxillary with only 1-3 teeth, extends to the anterior border of the 

 pupil of the eye. A silvery lateral l)and present, and a diffuse 

 caiidal spot, no humeral spot. A. 19, head 3.2, depth 2.y, scales 

 5-31-3 95. paucidens. 



II. Lateral line interrupted or complete. 



* Anal rays 19-24. 



t tScalcs of moderate size 5 or 6-35 to 38-6 or 7. IVIaxillary with 1 to 3 

 teeth. A dark caudal spot extends to the end of some of the rays and 



* T. pulclier (88) A. 22, D. 10, Head .'i^^, depth 3% (vvitli caudal). Eye 3 in the head and 

 once in the interorbital. Caudal and humeral spot present. 



t T. argcntatus (90) is very near and may be identical with mc.ric<tntii< Filippi. 



