798 



MR. C. TATE REGAN ON 



[Nov. 12, 



the fins; fins dusky, the posterior half of each interradial mem- 

 brane of the dorsal darker than the rest. 



Hob. Rio Piracicaba, San Paulo, Brazil. 



Two specimens, 170 and 220 mm. in total length, received 

 from Dr. R. von Ihering. 



Plecostomus goyazensis, sp. n. 



Plecostonius latirostris (part.) Regan, Trans. Zool. Soc. xvii. 

 1904, p. 213. 



Depth of body 5 in the length, length of head 3^. Depth of head 

 l|-in its length, breadth of head 1, length of snout 1-|, diameter of 

 eye 7, interorbital width 2|^. Length of mandibvilar ramus 1|- in 

 the interorbital width ; 28 teeth on each side in both jaws ; barbel 

 |- the diameter of eye. Snout broad, i-ounded ; supraorbital edges 

 slightly raised ; supraoccipital with median ridge, bordered pos- 

 teriorly by a single scute ; temporal plates not distinctly keeled. 

 Scutes spinulose, the iipper and anterior ones very weakly keeled, 

 27 in a longitudinal sex'ies, 6 between dorsal and adipose fin, 13 

 between anal and caudal. Lower surface of head and abdomen 

 nearly completely covered with small gi-anular scales. Dorsal I 7 ; 

 length of base equal to the distance from tip of spine of adipose 

 fin. Anal I 4. Pectoral spine extending to anterior g of ventral. 

 Caudal emarginate. Caudal peduncle 3 times as long as deep. 

 Uniformly brownish (in spirit). 



Hab. Goyaz. 



Text-fig. 207. 



Plecostomus goi/azensis. 

 Head seen from above (a) and below [h). 



A single specimen, 260 mm. in total length, received in 1889 

 from the Museum of Comparative Zoology, Cambridge, Mass., 

 U.S.A. 



P. latirostris is distinguished by the more slender and more 

 numerous teeth and by the shorter caudal peduncle. 



