410 CALIFORNIA ACADEMY OP 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. 



Pkcosio?nus macrops Eigeum. & Eigenm. Proc. Cal. Acad. 2d. Ser. 

 i, 170, 1888 (Eio das Velhas). 



This species differs from livia 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 Ltltkeu, Overs. Dan. Selsk. No. ,3, 30, 1873 

 (St. Francisco Kiver); id. Velhas Flodeus Fiske, 143, 1875 (Kio 

 das Velhas). 



Habitat: Kio San Francisco and its tributaries. 



This species is known to us only from descriptions. 



361. Plecostomus alatus. 



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

 XX, fig. 1, 1855 (Araguay). 



Plecostomus alatus Gtinther, v, 234, 1864 (Kiver Cipo); Liitkeu, Vel- 

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



Habitat: Araguay; Kio das Velhas. 



This species is known to us only from descriptions. 



362. Plecostomus auroguttatus. 



Hijpostomas auroguttatus Kner, Hypostomideu, 269, pi. ii, fig. 3, 



1853 (Kio Parahyba). 

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



uer, Flussfische Siidam.iii, 6, 1881 (Kio Janeiro). 

 Hyposiomus 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 

 Mddth of its head. 



