1903.] NATURAL SCIENCES OF PHILADELPHIA. 499 



Distance of the dorsal from the tip of the snout 2f in the length. 

 Pectoral spines twice as long as the coracoid processes, armed on both 

 edges with long hooks, those on the posterior edge and on the proximal 

 half of the anterior edge pointing inward, those on the distal half of 

 the anterior edge pointing outward. 



Color dark brown; the numerous warts white, giving a speckled 

 appearance. The fins light })rown, irregularly speckled and mottled 

 with darker. 



This species is most closely related to B. gronovii and B. hicolor. It 

 agrees with gronovii in the distance of the dorsal spine from the tip of 

 the snout and in having the keels and knobs of the head well developed. 

 It differs from gronovii in having the coracoid processes only half as 

 long. 



It agrees with hicolor in having 7 anal rays, and in the general shape 

 of the coracoid ridges and processes. It differs from hicolor in having 

 the knobs and keels of the head l^etter developed. 



3. Rhamdia quelen (Quoy and Gaimard). Bagreor Mandii, Mandiiguaru. 



Four specimens (Nos. 25, 133, 148, 269). Estancia La Armonia; 

 Asuncion and Campo Grande. 



4. Pimelodus ornata Kner. Mandii guani. 



One specimen (Xo. 167). Lagima at Asuncion. Very rare. Prof. 

 Anisits records taking another specimen in the Arroyo Trementina. 



5. Pimelodus albicans (Cuv. and Val). Mandii guani. 



Two specimens (Nos. 54 and 56). Rio Paraguay at Asuncion. 



6. Pimelodus clarias (Bloch). Eagre amarilbo, Mandii saiyu. 



Three specimens (Nos. 197 and 263) of type h, as defined by Eigen- 

 mann. Arroyo Trementina and Rio Paraguay at Asuncion. 



Seven specimens (Nos. 149, 166, 551). Rio Paraguay at Asuncion. 

 The most abundant of the fishes. 



7. Pimelodus valenciennis (Knlyer). Bagre and Mandii. 



One specimen (No. 259). 20 cm. Laguna Ypacarai (Arcgua). 

 Anal rays 15. 



8. Iherinichthys labrosus (Kroyer). 



Nine specimens (Nos. 55, 150, 162, 163, 165). 10-19 cm. Asuncion, 

 Rio Paraguay. 



9. Hemisorubim platyrbynchos (Cuv. and Val.). 



One specimen (No. 53). 42 cm. Asuncion, Rio Paraguay. 



10. Pseudoplatystoma coruscans (Agassiz). Suruby, 



Two specimens (No. 47). 40 and 48 cm. Asuncion, Rio Paraguay. 

 This is a common market fish. It reaches a length of a meter. 



