Pearson: Fishes of the Rio Beni Basin 
27 
Curimatus nasus Steindachner. 
The specimens listed below may belong to more than one 
species, but the variation is so great that I can give no final 
opinion and confine myself to describing the groups of speci- 
mens. 
17130, 18, 88-125 mm., Iluachi, Bolivia. Aug., 1921. 
There are 8 specimens which have the tip of the snout blunt 
and narrow when seen from below, the distance from the 
mouth to the tip of the snout is not so great as in the other 
10 ; the caudal spot is continued distinctly to the end of the 
middle caudal rays. Lateral line 46 to 48. 
There are 10 specimens which have the tip of the snout 
pointed when seen from below, the caudal spot is not con- 
tinued distinctly to the end of the middle caudal rays. Lat- 
eral line 46 to 47. 
17131, 1,. 85 mm., Huachi, Bolivia. Oct., 1921. 
The caudal spot is indistinct. The base of the caudal has 
an abnormal dark bar across it. Lateral line 46. 
17132, 19, 78-92 mm., Rurrenabaque, Bolivia. Oct., 1921. 
Caudal spot may or may not be prolonged to the end of the 
middle caudal rays. Lateral line 46 to 48. 
17133, 8, 70-115 mm., Ixiamas, Bolivia. Dec., 1921. 
Caudal spot may or may not be prolonged to the end of the 
middle caudal rays. Lateral line 44 to 48. 
17134, 2, 95 and 128 mm., Pena Colorado, Upper Beni, Bolivia. Sept., 
1921. 
Caudal spot not prolonged to the end of the middle caudal 
rays. Lateral line 47 and 48. 
17135, 10, 88-110 mm., Lower Bopi, Bolivia. Sept., 1921. 
Caudal spot not prolonged to the end of the middle caudal 
rays. Lateral line 45 to 48. 
17136, 1, 100 mm., Eio Colorado, Lower Bopi, Bolivia. Sept., 1921. 
Caudal spot not distinctly prolonged to the end of the mid- 
dle caudal rays. Lateral line 47. 
17125, 1, 74 mm., Rio Iniqui, Upper Beni, Bolivia. Sept., 1921. 
Caudal spot may or may not be prolonged to the end of the 
middle caudal rays. Lateral line 44. 
5—30279 
