1903.] NATURAL SCIENCES OF PHILADELPHIA. 501 



Pectoral spine similar to dorsal, reaching the 5th or 6th scute. 

 Light brown, shading into lighter below, everywhere mottled and 

 marbled with darker shades. The fins similarly colored. 



Lat. plates 29-30; head 3f ; depth 4f; D. I, 6; A. 13; V. 7; P. I, 8. 



15. Oxydoras knerii (Bleekeri. Armado, Ytagua-poschu.^ 



Two specimens (No. 52), 35 and 36 cm. Asuncion, Rio Paraguay 

 (laguna). March, 1900. Very abundant; the commonest market fish. 

 One specimen (No. 131). Matto Grosso or Asuncion. 



16. Auchenipterus nigripinnis Boulenger. Bagre. 



One specimen (No. 71). 17 cm. Asuncion, Rio Paraguay (Pasito). 

 Very rare. 



17. Trachycorystes striatulus Steind. 



One specimen (No. 61). 13 cm. Asuncion, Rio Paraguay. Taken 

 alive from the stomach of a large Sorubim. It is not known to the 

 fishermen. 



18. Loricaria rostrata Spix. 



Two specimens (Nos. 180 and 125), a male and a female. 300 and 

 220 mm. From the Arroyo Trementina and from a laguna near 

 Asuncion, Rio Paragua}'. 



19. Loricaria labialis Boulenger. Maimingue.'' 



Eight specimens (Nos. 62, 151, 175, and 178). 130-240 mm. Asun- 

 cion, Rio Paraguay'. Common, caught with seine. One specimen (No. 

 214), 130 mm., from Arroyo Trementina. Our specimens agree in 

 nearly all respects with those described by Boulenger. The snout is 

 slightly thicker and more acute. The labial fold is slightly fringed. 



20. Loricaria stubelli Stein dachner. Maimingue. 



Thirteen specimens (Nos. 64, 177 and 179). From Asuncion, Rio 

 Paraguay. Two specimens (Nos. 207 and 212), from the AiToyo 

 Trementina. Nos 177 and 207 are males with broad under lip. 



These specimens differ from Steindachner's figure of stubelli in the 

 greater width of the interorbital, 3| in length of head. 



21. Loriacaria lata E- and E. Maimingue. 



Nine specimens (Nos. 60, 163, 142. 175, and 210). 70-280 mm. 

 Asuncion, Rio Paraguay. One specimen (No. 210) from Arroyo Tre- 

 mentina. 



22. Loricaria lamina Ounther. 



One specimen (No. 124). 200 mm. Matto Grosso. Cohected by 

 Dr. Carl Ternetz. 



^ Yta = stone, gua = place, poschu = bad. 

 * Maimi = old woman, gue = it was. 



