500 PROCEEDINGS OF THE ACADEMY OF [Julj 



11. Sorubim lima (Bloch and Schneider). Pico de pato = duck-bill. 



One specimen (No. 48). 35 cm. Asmicion, Rio Paraguay. Rare 



12. Doras costatus Linnaeus. 



One specimen (No. 130). 20 cm. 



13. Doras maculatus Val. Armado and Ytagua. 



One specimen (No. 51). 36 cm. Asuncion, Rio Paraguay. March; 

 1900. 



A common market fisli; meat of good flavor. 



14. Doras nebulosus sp. no v. 



Type, No. 9,837, one specimen (No. 129). 1(3 cm. Collected by 

 Dr. Carl Ternetz, either in jMatto Grosso or Asuncion. 



Form elongate ; depth below dorsal ec|uals width. Caudal peduncle 

 narrow, compressed, width 1^ in height. Humeral processes with a 

 narrowed base, point acute. Dorsal plate roof-shaped, prolonged 

 back of the first dorsal ray in a narrow process. Fontanel elongate, 

 ending in front in a groove extending to between the posterior nares. 

 Humeral processes and l^ones of the top of the head finely granular. 

 Opercles, suborbitals and prenasals entirely covered with skin. 



Eye small, 7^ in head, 3^ in snout, 2 in interorljital. Center of eye 

 as far from posterior nostril as this is from anterior nostril, and as far 

 as the anterior nostril is from tip of snout. 



Maxillary barl^el scarcely reaching the gill opening. Mefital l^arbels 

 twice as long as eye ; post mental barbels slightly longer. 



Snout narrow, width -just back of maxillary l^arbels 4 in head. 

 Mouth inferior, width H in snout. A small l)and of intermaxillary 

 teeth ^ as long as mouth is wide, the width of the band ^ in its length. 

 j\Iaxillary teeth in a triangular patch, slightly wider than the inter- 

 maxillary band and half as deep as wide. 



Gill membranes separate to below the bases of the pectoral spines. 

 Breast entirely covered with skin. 



Lateral plates narrow, the first 5-6 without dorso-ventral wings. 

 The lateral plates widest beneath the adipose, where their width is 

 contained in depth of body 3^ times. The median hooks the same 

 height for the whole length. 



A median series of 10-12 plates between the adipose and the caudal 

 and a similar series of 10-12 iDetween the anal and caudal. 



Distance of the dorsal spine from tip of snout 2^-2f in length of 

 ])ody. Dorsal spine about as long as the head, very strongly serrated 

 on both edges ; the spines on the posterior edge twice as long as those 

 on the anterior edge. Distance of adipose from dorsal 4^ in the length. 

 Adipose low, its base f longer than base of dorsal. 



Anal fin rounded, its height If in head. 



