quáble difterence as to the number of anal rays (36 
against 24 in H. eigenmanni Steind. (*) and 16-18 
in H. mustelinus (Vai). It eannot be supposed tliat 
these difterenees are due to the speeimens being older 
or younger, as tliose descri bed by Steindachner (H. mus¬ 
telinus) are of the same length as oiu* specimen. 
Plecostomus (Rhinelepis) mierops n- sp- 
I). I, 6 3^2 5 A. I, 4 3^; Lat, L. 27; head to end 
of temporal plate 3 in the length; depth 6 
Head parabolic, arched above, without keels; occi¬ 
pital ending in a triangular crest and bordered behind 
by about 3 small plates; about 4 plates between the 
occipital and the basal plate of the dorsal, counting the 
small plates bordering the occipital ; interorbital evenly 
arched, 3 % in the head to end of temporal plate. 
Interorbital width 2 3 / 2 i 11 the length of the head, 
Eye minute, 3 in interorbital. Distance between anterior 
nostrils 2)A in interorbital. Ventral surtace entirely naked; 
back behind dorsal witli a median groove and lateral 
ridges, which meet in front of the dorsal; lower surface 
of tail flat with lateral edge; sides of tail flat behind, 
gradually becoming rounded forward; no carinae, a faint 
ridge along upper lateral plates, parallel with the dorsal 
edge; plates all granular or hispid; sides and margin 
(*) Steindachner F. Ueber einige Fischirten aus dem Flusse Cubatão, 
Sta. Catharina, Sitzb. Ak. Wiss. Math. Nat. Kl. Bd. CXVI, Abt. I, Wien, 
1907 p. 486-488. 
