410 CALIFORNIA ACADEMY OF SCIENCES. 



Base of the dorsal fin much greater than its distance 

 from the spine of the adipose fin, first dorsal ray con- 

 siderably higher than the last, equal to or greater than 

 the length of the head. 



Head 3J. 



358a, Plecostomus lima atropinnis var, nov, 



Type: No. 7871a, one specimen .21 m. Goyaz. Sen- 



hor Honorio. 



359, Plecostomus macrops. 



Plecostomus macrops Eigenm. & Eigenm. Proc. Cal. Acad. 2d. Ser. 

 i, 170, 1888 (Kio das Velhas). 



This species differs from lima only in the characters in- 

 dicated in the key. 



Type: No. 7888, one specimen .28 m. Rio das Vel- 

 has. Allen & St. John. 



360, Plecostomus francisci. 



Plecostomus francisci Liitken, Overs. Dan. Selsk. No. 3, 30, 1873 

 (St. Francisco River); id. Velhas Flodens Fiske, 143, 1875 (Kio 

 das Velhas). 



Habitat: Eio San Francisco and its tributaries. 



This species is known to us only from descriptions. 



361, Plecostomus alatus, 



Hypostmous alatus Castelnau, Anim. Amevique du Sud. 41, plate 

 xx, fig. 1, 1855 (Araguay). 



Plecostomus alatus Giinther, v, 234, 1864 (Kiver Cipo); Liitken, Vel- 

 has Flodens Fiske, 144, 1875 (Kio das Velhas). 



Habitat: Araguay; Rio das Velhas. 



This species is known to us only from descriptions. 



362, Plecostomus auroguttatus, 



Hypostomus auro<juttatus Kner, Hypostomiden, 269, pi. ii, fig. 3, 



1853 (Rio Parahyba) . 

 Plecostomus auroguttatus Giinther, v, 234, 1864 (copied); Steindach- 



iier, Flussfische Siidam.iii, 6, 1881 (Rio Janeiro). 

 Hypostomus asperatus Castelnau, Anim. Amer. Sud. 41, pi. 20, fig. 2. 

 Habitat: Coast streams of Southeastern Brazil. 



This species is known to us only from descriptions. 

 It seems to differ from all other known species in the 

 width of its head. 



