Loricariid Fishes from Brazil. 559 



cavinate ; 29 in a longitudinal series, 7-8 between dorsal and 

 adipose fin, 16 between anal and caudal. Supraoccipiial 

 entirely bordered posteriorly by a single scute. Lower 

 surface of bead and abdomen completely covered with small 

 granular scale?, excej)t for a median naked area behind the 

 lower lip. Dorsal I 7, the first ray nearly as long as the 

 distance from its base to the tip of snout, when laid back 

 extending to the adipose fin; last ray \ as long as the first. 

 Length of base of dorsal equal to its distance from the 

 posterior })art of the spine of the adipose fin. Anal I 4. 

 Pectoral spine extending to anterior \ of ventral or a little 

 beyond. Caudal moderately en\arginate, the lower lobe the 

 longer. Caudal peduncle 2|-3 as long as deep. Some 

 rather small light spots on the upper part of head and body ; 

 dorsal brownish, with light spots posteriorly. 



Two specimens, 205 and 275 mm. in total length, from 

 the Kio Piracicaba, Sao Paulo, Brazil. This species is allied 

 to P. ulatusj Casteln. 



Plecostomus tietensis. 



Depth of body -l? in the length, length of head 31. Depth 

 of head 1| in i(s lengtli, breadth of head 1, length ot snout If, 

 diameter of eye 6|, interorbital width 2f . Length of mandi- 

 bular ramus 2^ ni the interorbital width. Barbel | tlie 

 diameter of eye. Snout broad, rounded ; supraorbital 

 niargins slightly raised; supraoccipital without median 

 ridge, nearly flat; temporal plates not carinate. Scutes 

 spinuiose, not carinate, 27 in a longitudinal series, 7 between 

 dorsal and adipose fin, 14 between anal and caudal. Supra- 

 occipital bordered posteriorly by a median scute and by one 

 on eacii side. ]jOwer surface of head and abdomen naked, 

 except for a granular strip between the bases of the pectorals. 

 Dorsal I 7, the first ray 4 the length of iicad, when laid back 

 reaching a little beyond the base of the last ray, which is ? 

 as long ; length of base of dorsal equal to its distance from 

 posterior part of spine of adipose Im. Anal I 4. Pectoral 

 extending to anterior ^ of ventral. Caudal slightly and 

 obliquely emargiuate. Caudal peduncle 3 times as long as 

 deep. Upper part of head \\\\.\\ dark stripes or verniicu- 

 lations ; body with dark spots ; fins with dark cross-bars or 

 series of spots. 



One specimen, IGO mm. in total length, from the llio 

 Tiete, Sao Paulo, Brazil. 



This species is nearest to P. Vaillanli, Stcind., but is very 

 distinct. 



