1913.] NATURAL SCIENCES OF PHILADELPHIA. 549 



though none on other fins, and ventral axil with short, pointed scale. 

 No 1. 1. developed. 



Dorsal origin a little nearer snout tip than caudal base, first 

 branched ray longest, and depressed fin not quite reaching half way 

 to caudal base. Adipose fin rather large, its base placed over last 

 anal ray bases. Anal inserted a little nearer pectoral origin than 

 caudal base, below posterior dorsal rays, and first branched ray 

 longest, so that fin elevated in pointed lobe. Caudal well forked, 

 pointed lobes equal. Pectoral low, not quite reaching to ventral 

 origin, upper rays longest, and fin pointed. Ventral inserted well 

 before dorsal, or nearly midway between pectoral and anal origins, 

 fin reaching anal. Vent opens about midway in post ventral region. 



Color in alcohol pale brownish generally, lower surface paler. 

 Scales on back all with dusky edges. Upper surface of head dusky, 

 sides and below paler. Muzzle, and opercle above, with dusky dots. 

 Iris slaty. Fins all dusted with dusky dots. At shoulder, behind 

 gill-opening, large cluster of dusky dots, though not forming a 

 defined humeral blotch. A dark vertebral line along sides after 

 humeral clouding extending to caudal base, along side of caudal 

 peduncle expanding broadly and becoming black. On caudal base 

 it narrows suddenly and extends out on median caudal ra3^s. Base 

 of each caudal lobe with pale or whitish area. 



Length 23 mm. 



Type, No. 39,231, A. N. S. P. Tributary of the Madeira River 

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

 Smith. 



Only the type known. It is likely related to Moenkhausia cotinho 

 Eigenmann, but that species is said to have 20 or 21 anal rays, and 

 a very large conspicuous vertically oval black spot on base of caudal, 

 bordered behind by milky-white. 



{lTtXfiaTca<,^^ branded person, with reference to the black caudal 

 blotch.) 



Hyphessobrycon agulha sp. nov. Fig. 15. "Agulha." 



Head 3f ; depth 31; D. iii, 9; A. iv, 19, i; P. i, 13; V. i, 7; 

 scales 32 in median lateral series to caudal base and 2 more on latter ; 

 1. 1. of 12 tubes anteriorly, extends back and down in gentle curve 

 little beyond front of dorsal; 6 scales above 1. 1. to dorsal origin; 

 3 scales below 1. 1. to ventral origin; 9 predorsal scales to occipital 

 process; head width 1| in its length; head depth at occiput 1^; 

 mandible 1|; first branched anal ray Ij; least depth of caudal 



