558 ^Ir. V\. von llicilng on new 



Snout 21-0 in the length of head, diameter of eye ?>-?>l, inter- 

 orbital width 3^-3i, depth of praeorbital 3-3^. Maxillary 

 not extendinfi^ to below the eye ; jaws equal anteriorly ; fold 

 of the lower lip continuous ; cheek with 5 to 7 series of scales; 

 pra^operculum scaleless ; 2 or 3 gill-rakers on the upper part 

 of tlie anterior arch, 7 to 9 on the lower. Scales 29-30 j^^^, 

 2 between lateral line and anterior rays of soft dorsal, 

 those of the thoracic region very small. Dorsal XIII-XIV 

 10-11 (12), commencing above the opercular cleft, the spines 

 Rubeqnal from the fourth, tlie last i the length of head or more. 

 Anal III 8-9. Dorsal and anal fins scaleless. Pectoral 

 longer than the head, extending to above the anal spines. 

 Caudal slightly emarginate. Caudal peduncle longer than 

 deep. Brownish ; a blackish vertical stripe through the 

 eye ; sometimes a dark blotch on the middle of the side ; 

 membrane between first 4 or 5 dorsal spines blackish at the 

 tip; middle of caudal with dark cross-bars. 

 li. Amazon. 



1-3. (81-101 ram.) Obidos. Prof. A. Agassiz. 



3. (102 mm.) L. Hyanuary. Mas. Comp. Zool. 



LXXV. — Descriptions of Four neiv Loricariid Fishes of the 

 Genus Plecostomus from Brazil. By IxUDOLF VON 

 JlIEKlNG. 



The fishes described below were brought by me from the 

 Museo Paulista, Sao Paulo, Brazil, for comparison with the 

 specimens preserved in the Natural History Museum. In 

 writing these descriptions I have been helped by advice from 

 Mr. C. Tate Regan, who has also kindly given me his 

 authority that the species are distinct from those described by 

 him in his Monograph of the Loricariida?. 



Plecostomus Reyani. 



Depth of body 4},-l| in the lengtii, length of head 3.\. 

 Depth of head In in its length, breadth of head 1^, length of 

 snout If, diameter of eye 5i-6, interorbital width 2^-2|. 

 Length of mandibular ramus 2 in the interorbital width. 

 Barbel | the diameter of eye. Snout broad, rounded. Supra- 

 orbital margins not raised, supraoccipital with a very slight 

 median elevation ; temporal plates not carinate. Scutes 

 spinulose, the anterior ones of the two upper series weakly 



