1895.] ^OM MCATTO GtRO^SO AND PAUAGUAY. 529 



length of suout, equal to interorbital width; maxillary toothless, 

 extending to below anterioi- border of eye. Dorsal 11, originating 

 behind vertical of veutrals, longest rays as long as head. Anal 

 40-42, deepest anteriorh^ longest i-ays a little shorter than head. 



Caudal bifurcate. Scales 30-33 ^g; lateral line complete. Pale 

 brownish, upper surface of head, dorsal, anal, and lower part of 

 caudal region of body blackish ; two blackish vertical bands on 

 upper half of body, the first behind the head, the second below the 

 origin of the dorsal fin. 



Total length 45 millim. 



Several specimens from Descalvados, Matto Grrosso. 



13. Tetragonopteeus tjleeti, sp. n. 



Depth of body 2| to 2| in total length, length of head 31 to 3| 

 times. Diameter of eye half length of head, twice length of 

 snout, equal to interorbital width ; maxillary toothless, extending 

 to below anterior third of eye. Dorsal 10, originating behind base 

 of ventrals, longest rays as long as head. Anal 23-25, anterior 

 rays elongate, a little shorter than the head. Caudal bifurcate. 

 Scales 32-33 - ; lateral line reduced to 8 or 9 scales. Yellowish, 



with a small black humeral spot, a black line along the middle of 

 the side, and a black line along the base of the anal fin ; dorsal 

 blackish at the end. 



Total length 35 mUlini. 



Several specimens from Descalvados, Matto Grrosso. 



The species is named after Prof. A. B. Ulrey, the author of a 

 very useful key to the determination of the species of this genus. 



14. AnACTETUS PEOGIf athtjs, sp. u. 



Depth of body 24 in total length, length of head 4 times. 

 Snout strongly projecting beyond the mouth, squarely truncate, 

 with two strong tooth-like spines pointing outwards and forwards ; 

 several smaller teeth on each side of the upper jaw and two on each 

 side of the lower ; diameter of eye \ length of head, 1| in length of 

 snout, 1 5 in interorbital width ; maxillai'y extending to below 

 anterior third of eye ; upper profile of head very concave. Dorsal 

 11, equally distant from eye and base of caudal, longest rays 

 a little shorter than head. Anal 52. Caudal deeply forked. 

 Tellowish, with a silvery lateral stripe ; end of snout and a small 

 spot at base of caudal blackish. 



Total length 125 millim. 



A single specimen. 



This paper will be published entire in the Society's ' Transac- 

 tions,' with illustrations of the new species. 



Pboc. Zool. Soc— 1895, No. XXXIV. 34 



