392 CALIFORNIA ACADEMY OF SCIENCES. 



LXXVIII. PAROTOCINCLUS. 



Parotocinclus Eigenm. & Eigenm. Proc. Cal. Acad. 2d 

 Ser. ii, 41, 1889 (notatus). 



Type: Otocinclus maculicauda Steindachner. 



This genus is distinguished from Hisonotus by pos- 

 sessing an adipose fin. 



338, Hisonotus maculicauda, 



Otocinclus maculicauda Steindachner, Siisswasserfische sudostl. 



Bras, iv, 6, pi. 1, fig. 2-2b (loc. ?); Eigenm. & Eigenm. Proc. 



Cal. Acad. 2d Ser. ii, 41, 1889 (Santa Cruz). 

 Habitat: Santa Cruz. 



Caudal with a dusky spot on base of middle caudal 

 rays and a smaller one on the tip of its lower rays; eye 

 larger than in H. notatus; otherwise as in Hisonotus 

 notatus. 



Three specimens. Santa Cruz. Dom Pedro II. 



LXXIX. OTOCINCLUS. 



Otocinclus Cope, Proc. Acad. Nat. Sci. Phila. 1871, 283 

 (vestitus). 



Type: Otocinclus vestitus Cope. 



This genus is distinguished from all other Loricariidce 

 by its perforated temporal plate and large ventral plate. 

 These characters seem to us to be of generic value in 

 themselves, and we exclude from Otocinclus all species 

 not possessing them, however closely they may resemble 

 it otherwise. 



Habitat: Ambyiacu River; Santa Cruz. 



ANALYSIS OF THE SPECIES OF OTOCIXCLUS. 



a. Lat. 1. 23-24. Eye 5 in head. D. I, 7. affinis 339. 



aa. Lat. 1. 21. Eye 3 in head. D. I, 6. vestitus 340. 



339. Otocinclus affinis. 



Otocinclus ajfinis Steindachner, Siisswasserfische Siidostl. Bras, iv, 

 pi. ii, figs. 1-16 (Santa Cruz, near Eio Janerio); Eigenm. & 

 Eigenm. Proc. Cal. Acad. 2d Ser. ii, 41, 1889 (Santa Cruz). 



Habitat: Santa Cruz. 



