10 Annals of the Carnegie Museum. 



Cotypes, ii specimens, 52-68 mm. to tip of middle caudal rays. 

 Chipoo Creek. (C. M. Cat. No. 1509, #-<:; I. U.) 



Allied to magdalencz, konopickyi and brunnea, differing from the 

 latter in having the head strigilate. 



Head 5 ; width of head ij^ in its length ; eye 6, interorbital 43^, 

 snout 2. 2 in the head ; width at first anal ray 5.33-5-66 in its distance 

 from the caudal; 17 -f- 13 to 14+ 15 scutes, the lateral keels nearly 

 merged behind. 



Upper lip with a marginal fringe of tentacles ; lower lip not ex- 

 tending to the gill-opening, papillose except near the margin, with a 

 marginal series of tentacles. 



About six teeth on each side of the upper jaw and eight on each side 

 of the lower. 



Head and body strigilate, lateral keels weak, other scutes, except 

 nuchal scutes, not carinate ; occipital with a pair of slightly diverging 

 keels, the two nuchal plates following it each with a pair of keels. 



Orbital notch narrow and deep, eye nearly circular. Lower surface 

 of the head naked except for a narrow entering triangle in front of the 

 gill-opening. 



Anal plate margined by three large plates, the ventral buckler com- 

 posed of eleven plates ; posteriorly three, anteriorly five, series of plates 

 between the lateral series of the belly. Ventral armature fully de- 

 veloped even in the smallest to between the anterior angle of the gill- 

 openings. 



Dorsal spine about equal to the head. Pectorals truncate, reaching 

 ventrals. Ventrals rounded, or the outer ray slightly produced, reach- 

 ing the anal ; upper caudal ray forming considerably more than a third 

 of the total length. 



Dark, with the usual cross-bars ; pores black, but not conspicuous. 

 Dorsal rays spotted, a large spot near the tip of the three first rays. 

 Pectorals, ventrals, and anal barred, the bars most evident on the first 

 rays. Base and margin of caudal black, the outer rays barred. 



Named for Mr. Douglas Stewart, Curator of Mineralogy and Assist- 

 ant to the Director of the Carnegie Museum. 



Loricaria submarginatus sp. nov. 



Type unique. (No. 15 10 Carnegie Museum Catalog of Fishes. ) 

 142 mm. over all, 92 mm. to tip of middle caudal rays. Creek below 

 Potaro Landing. 



