530 PROCEEDINGS OF THE ACADEMY OF [-Tuly, 



D. I, 26; A. II, 33; abdominal serrse 36 ( + 8 double ones); lat. 1., 

 about 80. 



Head 4; depth If. Abdominal profile very greatly arched, more or 

 less angulated at the origin of the anal. The anal basis inclined at 

 an angle of about 45 degrees. Dorsal profile regularly arched from 

 nostrils to caudal peduncle, highest at the first dorsal ray; snout 

 decurved. Suborbital narrow, the cheeks mostly naked. 



Eye 2f in head, nearly 2 in interorbital. 



Anal distinctly falcate, the first ray heavy, leathery, about equal to 

 the head in length. Dorsal and caudal naked; anal narrowly scaled 

 at its base. 



Dark above, light below with metallic reflections, no markings such 

 as are seen in the young. 



90. Mylossoma* albiscopus (Cope). I'irana, Palomela. 



Two specimens (2, 85), Rio Paraguay and Laguna at Asuncion. 



91. Colossoma' brachypomus (Cuv.). Tacn. 



One specimen (261), Rio Paraguay at Asuncion. This specimen, 

 540 mm. long, lacks an adipose dorsal fin. 



92. Symbranchus marmoratus Bloch. Piramboi (Pira = fish, mboy = snake). 



Five large specimens (136), Asuncion (152), Campo Grande; Pirayu. 

 Nine j^oung (103), Rio Branco. 



93. Sternarchus albifrons L. 



One specimen (199), Arroyo Trementina. 



94. Hypopomus brevirostris Steindachner. 



Four specimens (108, 158, 220), Matto Grosso or Asuncion. Campo 

 Grande and Arroyo Chagalalina. 



95. Eigenmannia virescens (Val.). 



Two specimens (109 and 200), Matto Grosso or Asuncion, Arroyo Tre- 

 mentina. 



96. Giton fasciatus (Pallas). Anguilla. 



Four specimens (21, 161, 198), Estancia La Armenia, Campo Grande; 

 Arroyo Trementina. 



97. Fundulus (?) paraguayensis sp. nov. 



Type No. 10,064, a female, with ripe eggs, 57 mm. (222) . Laguna near 

 Arroyo Trementina. 



D. 10; A. 12; lat. 1., 34; head 3^; depth 4. 



Elongate, rather slender, compressed from anus backward. Dorsal 

 and ventral profile nearly equally arched to above the ventrals. Head 



* New for Myletes albiscopus Cope. 

 ' New for Myletes ocrihis Cope. 



