542 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Rakers about 8 + 16, slender, lanceolate, pointed, a little shorter 

 than filaments, and latter about 2^ in eye. Is'thmus narrowly 

 constricted, with short median groove in front and posterior portion 

 convex. Branchiostegals moderate, subequal. 



Scales moderate, cycloid, rather well exposed, each with several 

 radiating striae, disposed in longitudinal series parallel with 1. 1., and 

 in size mostly uniform. Caudal over greater basal portion covered 

 with small scales, though medianly scarcely smaller than on side 

 of body. Several scales form slight sheath at base of anal anteriorly. 

 Ventral axil with free pointed scaly flap, about 3^ in fin. Scales 

 completely pass over edges of body. L. 1. complete, slightly de- 

 curved until falling f in greatest body depth, and extends a little 

 low along side of caudal peduncle to caudal base. Tubes simple, 

 and extend well over scales, though not quite to their hind edges. 



Dorsal origin about midway between snout tip and caudal base, 

 first branched ray longest, and depressed fin extending slightly over 

 half way to base of caudal. Adipose fin slightly behind last third in 

 space between dorsal origin and caudal base, its length about | of 

 eye. Anal inserted slightly behind dorsal base, first branched ray 

 longest, so that anterior fin elevated in distinct lobe. Caudal well 

 forked, rather broad and pointed lobes about equal. Pectoral low, 

 pointed, upper rays longest, and when depressed fall a little short of 

 ventral. Ventral inserted a little before dorsal and extends | to 

 anal. Vent a little behind last third in postventral region. 



Color in alcohol pale brownish generally, paler or more whitish 

 below, as on lower sides and under surface of head, and abdomen. 

 Edges of scales on back all broadly brownish. Upper surface of 

 head brownish, also muzzle. Iris slaty. Fins all pale, except 

 variegated caudal, which with large black blotch basally, continued 

 out on middle rays and outer half of each lobe with a large jet-black 

 blotch. Along side of trunk- a dusky vertebral streak, widening 

 posteriorly to blackish and finally merging with caudal blotch. 

 In dark lateral streak, two scales from head, black rounded blotch 

 large as pupil. 



Length 57 mm. 



Type, No. 39,224, A. N. S. P. Tributary of Rio Madeira near 

 Porto Velho, Brazil. January-February, 1913. - Edgar A. Smith. 



Also, Nos. 39,225 to 39,227, A. N. S. P., paratypes, same data. 

 Head 3| to 3|; depth 3f to 4; D. in, 9; A. iv, 19, i; scales 32 to 

 34 in 1. 1. to caudal base, and 1 or 2 more on latter; 6 scales above 

 1. 1.; 4 or 5 scales below 1. 1.; 10 or 11 predorsal scales to occipital 



