Haseman : ICxi-KDi HON TO Cf.ntrai, South Amikica. 319 

 Bunocephalus depressus, sp. nov. 



O'latc XIAlll, fiK. i; IMateXLIX.) 



Type (unique). — No. 2984. 5.5 cm. Rio Macluipo, near San 

 Joacjuin, Holixia, Se])tember 6, 1909. 



D. 5; A. 1 1 : I'. 1. 4: C. 9; distanro from tip of snout to base of dorsal 

 goes 2.8 in Kni;lli ot body; maxillary barbels extending slightly past 

 base of pectorals, and post mentals extending to the gill-oijcning; pec- 

 toral spine with hooks on bolli margins about as long as the width of 

 the spine; spine ecpial to tlu' distance from the tip of snout to the 

 base of the pectorals; head gently depressed, with no prominent knobs; 

 eyes small and about one-third of the interorbital space, which is 

 equal to the length of the snout; mouth small, upper jaw longer than 

 the lower, snout rather jiointed; width at base of pectorals greater than 

 the length of the head and one-fourtli of the length of the body, greatest 

 depth one-eleventh the length of the body; coracoid process shorter 

 than the humeral process, neither of which is very long; no warts or 

 papillae on the skin; uniform light brown in color, about six minute 

 dark spots or pores along the sides. 



This species is easily recognized by its greatly depressed body, the 

 eleven anal rays, and by the long post-dorsal portion of the body. 



AcESTRiDiUM, gen. nov. 

 Tip of snout expanded, disc-like, and provided with long spines; 

 D. .7; all of scutes provided with many series of delicate spiny ridges 

 and depressions. Otherwise like Farlowella. 



Acestridium discus, sp, nov, 



(Plate L, fig. i; Plate LI.) 



Type. — No. 2985. 7.2 cm. overall. Igarape de Cachoeira (-rande, 

 near Manaos, Brazil, Nov. 30, 1909. 



Cotypes. — No. 2986, a-b, 6 and 5 cm. Same place and date as type. 



Tail posteriorly depressed, with a single series of plates on the sides; 

 dorsal fin inserted over the anal; no adipose; abdomen without a 

 median series of plates; upper angle of gill-opening slightly nearer the 

 origin of dorsal than the tip of the snout; length of the produced snout 

 about 4 in the distance from its tip to the anus; tip of snout with an 

 expanded spiny disc; eye 4 in interorbital; head 3.5 in body; breadth 

 of head 3.5 in its length; all scutes with many delicate keels; D. .7; 



luj L I B R A ! 



