106 CALIFORNIA ACADEMY OF SCIENCES. 



Ventrals inserted behind the vertical from the last dor- 

 sal ray, lj-1 in the head. 



Pectoral spine longer than any of the other rays, flex- 

 ible and flattened, roughened in front, with straight teeth 

 along its inner margin. 



Color silvery below, light brown above. 



Head 4f-43-; depth 5; depth of caudal peduncle Hi; 

 Br. 9; D. I, 6; A. 11. 



XIII. LUCIOPIMELODUS. 



Luciojnmelodus Eigenm. & Eigenm. Proc. Cal. Acad. 

 &ci. 2d Ser. vol. i, 1888, 122 (pati). 



Type: Pimelodus pati Valenciennes. 



First dorsal and pectoral rays not spinous, flexible and 

 longer than any of the succeeding rays. Free margins 

 of the dorsal and anal emarginate. Barbels scarcely 

 margined. Head depressed. Snout elongate and spatu- 

 late. Fontanel continued to above the eye, a circular 

 depression at base of occipital process. Occipital pro- 

 cess narrow, not touching the dorsal plate. 



ANALYSIS OF THE SPECIES OF LUCIOPIMELODUS. 



a. Dorsal jDlate present, concealed under the thick skin. Adipose fin 3-4 

 in the length, equal to its distance from the first dorsal ray or from the 

 occipital process. Upper jaw projecting beyond the lower for not more 

 than } the diameter of the eye. Eye 11 in head. paii 71. 



aa. No dorsal plate (pre-dorsal scute). Adipose fin 4^ in the length, 

 equal to its distance from the fifth dorsal ray. Upper jaw much project- 

 ing beyond the lower. Eye 9 in head. Head covered with thin skin 

 above, occipital process narrow. Maxillary barbels extending to the 

 origin of the adipose fin, postmentals beyond the base of the pectorals. 

 Eye nearly median. Caudal fin deeply forked. Coloration uniform. 

 Head little less than 4 in the length. D. I, 6; A. 12 (Gunther). 



platanus 72. 



71, Luciopimelodus pati. 



Pme?ofZMS/)a<i Valenciennes, Voy. d'Orbigny. pi. i, figs 7-9, 1847. 

 Cuv. & Val., Hist. Nat. Poiss. xv, 176, 1840 (Parana; La Plata; 

 Corrientes; Buenos Ayres); Kner. SB. Ak. Wien, xxvi, 1857, 416 

 (Forte de S. Joaquim, Eio Branco); Gunther, Cat. Fish. Brit. 

 Mus. V, 128, 1864 (copied). 



