358 CALIFORNIA ACADEMY OF SCIENCES. 



Length of head to end of occipital plate, 2j-3| in the 

 length. 



D. 7; A. 6; V. 5; P. 7; lat. 1. 30-34. 



297, Farlowella knerii. 



Acestra knerii Steindachner, Flussfische Sudani, iv, 26, pi. vii, figs. 



1-la, 1882 (Canelos, Ecuador); Boulenger, Proc. Zool. Soc. 



Lond. March, 1887, 278 (Canelos; Sarayacu). 

 Farlowella knerii Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. ii, 34, 



1889. 

 Habitat: Ucayale and Pastasa rivers, eastern slopes of Ecuador 



and Peru. 



298, Farlowella oxyrrhynchus, 



Acestra oxyrrhynchus Kner, Panzerwelse, 95, pi. viii, fig. 2, 1853 

 (Kio Mamore); Giinther, Cat. Fish. Brit. Mus. v, 96, 1864 

 (copied). 



Farlowella oxyrrhynchus Eigenm. & Eigenm. 1. c. 33. 



Habitat: Rio Mamore. 



299. Farlowella amazona, 



Acestra amazonum Giinther, Catal. v, 271, 1864 (Santarem). 

 Farlowella amazona Eigenm. & Eigenm. 1. c. 33. 

 Habitat: Amazon near Santarem. 



300. Farlowella acus. 



? Loricaria scolapacina Fillippi, "Kev. & Mag. Zool. 156, 1853." 

 Acestra acus Kner, Panzerwelse, 93, pi. viii, fig. 1 (Caracas); Giin- 

 ther, Catal. v, 261, 1864 (copied). 

 Farlowella acus Eigenm. & Eigenm. 1. c. 34. 

 Habitat: Caracas. 



LXII. HEMIODONTICHTHYS. 



Hemiodontichthys Bleeker, Nederl. Tijdschr. Dierk. i, 

 81, 1863, (acipenserinus). 



This genus, composed of a single species, is distin- 

 guished by its long snout, which is expanded and armed 

 at the tip. The armature of the lateral keels is more 

 marked than in the species of other genera. In the 

 length of its snout this genus approaches Acestra, but 

 differs from it in the position of the dorsal fin. 



