156 CALIFORNIA ACADEMY OF SCIENCES. 



114. Pimelodella lateristriga. 



Pimelodus laterisirlijus Muller & Troschel, Horae Ichthyol. iii, 3, 

 1849 (Brazil). 



Pimelodas lateristriga Giinther, Cat. Fish. Brit. Mus. v, 118, 1864 

 (Brazil); Heusel, Wiegm. Arch. 1870, i, 69 (Porto Alegre);?Cope, 

 Proc. Philad. Acad. Nat. Sci. 1872, 270 (Ambyiacu Eiver); 

 Ltitken, Dau. Selsk. Skr. 1875, 171, fig. (Rio das Velhas); Steiu- 

 daehner, SB. Ak. Wien, Ixxiv, 1876, Sitsswasserfische siidostl. 

 Bras, iii, 45. (Rio Parahyba; Rio Doce; Rio Jeqnitinhouha; 

 Cannavierias; Muriahe and Rio Janeiro); Vaillaut, Bull. Soc. 

 Philom. series 7, iv, 52, 1880 (Calderon). 



Pimelodella lateristriga Eigenm. & Eigeum. Proc. Cal. Acad. 2d Ser. 

 i, 133, 1888 (Santa Clara; Rio Mncuri; Rio Doce; Cannav- 

 ierias; Sao Matheos; Mendez; Rio Trombetas; Obidos; Iga). 



Habitat: Rivers emptying into the Atlantic north of the Rio 

 Parahyba. 



The specimens examined are from Santa Clara; Rio 

 Mucuri; Rio Doce; Cannavierias; Sao Matheos; Mendez; 

 Rio Trombetas; Obidos; Iga; in all more than one hun- 

 dred specimens. 



Body elongate, slender, considerably compressed pos- 

 teriorly, head entirely covered with thin skin; fontanel 

 narrow. Occipital process reaching to the dorsal plate, 

 its margins nearly parallel. 



Eye rather large, 1^-11 ^ii snout, 3|-3§ in length of 

 head, the interorbital I3 in the orbital diameter. 



Maxillary barbel about to tips of ventrals and origin 

 of adipose dorsal; mentals to edge of gill-membrane or 

 about to base of pectorals. 



Lower jaw little included; width of mouth at the rictus 

 2§-3 in head; teeth of the lower jaw in a narrow cres- 

 cent; teeth of the upper jaw in a broad band, its depth 

 4 in its width; both bands interrupted in the middle. 



Gill-membranes separate to below front of eye. Gill- 

 rakers slender and short, 3-|-8. 



Dorsal spine slender, roughened on its posterior mar- 

 gin, the anterior margin with notches at the tip, its 

 height IJ in the length of the head; the highest ray 

 nearly equal to the length of the head. Dorsal spine 



