THE AMERICAN TETRAGONOPTERINAE. 211 



series of four 5-pointed teeth followed by three or four narrow, conical ones on 

 the sides. 



Gill-rakers 8 + 10. 



Anal sheath short, of about five scales covering the base of the first 7 rays. 

 Lateral line with pores developed on 9 to 12 scales. 



Origin of the dorsal a Uttle more than one half the eye nearer to the caudal 

 than to the snout; penultimate ray one half the longest, which is 3.5 to 4 in 

 the length. Caudal not as long as the head. Origin of the anal on the vertical 

 from the first or second scale behind the dorsal. Anal obliquely truncate, the 

 longest ray 1.33 in the base. Ventrals on the vertical from the third scale in 

 front of the dorsal. Ventrals reaching the second or third scale in front of the 

 anal. Pectorals reaching the first or second scale in front of the ventrals. 



Humeral spot narrow and vertically elongate. Caudal spot intensely 

 black, tapering forward into the lateral stripe, more suddenly constricted 

 behind and continued to the end of the middle caudal rays. Lateral stripe 

 overlaid with silvery; distal third of the anal more or less dusky. Scales of 

 the back dusky; scales of the sides, especially below the lateral stripe, with a 

 silvery blue iridescence. 



One specimen 73 mm., Rio das Velhas, (C. 3076a). Varies from typical 

 specimens as follows: — Depth 3.2. Maxillary with three tricuspid teeth; 

 caudal spot diffuse; humeral spot triangular, longest in the vertical elongation 

 but most intense at the posterior and horizontal Umb. 



29. Hyphessobrycon poecilioides Eigenmann. 



Hyphessobrycon poecilioides Eigenmann, Indiana univ. studies, 1913, no. 18, p. 29 (Cali). 



Habitat. — Cauca Basin. 



Specimens examined. 



Head 3.66-3.75; depth 2.66 9 -3 cf ; D. 11; A.16-18; scales 36 in a longi- 

 tudinal series, 12 series; usually about 9 scales with pores, rarely as many 

 as 16; eye 4 in head, 1.66-2 in interorbital, equal to snout; depth of caudal 

 peduncle 2.66-2.9 in the greatest depth. 



