318 FISHES OF THE FAMILY LORICARIID#, 
17. ASTROBLEPUS. 
Astroblepus Humboldt, Obs. Zool. i. p. 19 (1805), 
‘This genus, represented by a single species, is known only from Humboldt’s 
description and figure. It is allied to Arges, differing in the absence of ventral fins. 
It is possible that this latter feature is abnormal or accidental, and that the genus 
may be founded on a specimen of Arges brachycephalus or an allied species. 
+ ASTROBLEPUS GRIXALV&. 
Astroblepus grizavlii Wumb. Obs. Zool. i. p. 19, pl. vii. (1805) ; Cuv. & Val. Hist. Nat. Poiss. xv. 
p- 349 (1840) ; Giinth. Cat. Vish. v. p. 224 (1864) ; Eigenm. & Kigenm, Occ. Pap. Cal. Ac. 
i. 1890, p. 351. 
In form and proportions, in the position of the fins and in the number of their rays 
essentially similar to Arges brachycephalus Gthr. Dorsal with I 6 rays, anal with I 6, 
pectoral with I 9. Coloration uniform. 
‘Total length 350 mm. 
Popoyan, R. Cauca; known to the inhabitants as the pescado negro, and eaten by 
them. 
} have compared a specimen of Arges brachycephalus of 218 mm. with Humboldt’s 
figure and cannot see any differences except the absence of ventral fins. 

