10 Mr. G. A. Boulenger on some 



a little longer than the head. Anal 5. Pectoral I 5, nearly 

 as long as the head, and extending beyond the base of the 

 ventral. Ventral 1 5. Lower caudal lobe longer than upper. 

 Scales 25 g ; lateral line 25. Breast and belly partly naked; 

 in the smaller specimen the anterior portion of the belly is 

 covered with granular plates extending right across, in the 

 larger specimen these granulations are confined to the sides 

 and a median strip ; 12 scales between the anal and caudal 

 fins. Dark olive- brown, with rather indistinct round black 

 spotS) which are smaller and closer together on the head. 



Plecostomus cochh'odon, Kner. 



Of this remarkable fish, of which, like the preceding, no 

 other but the type, preserved in the Vienna Museum, 

 was hitherto known, a single specimen was obtained by Dr. 

 Evans at Jangada. It measures 180 millim. Its fins are 

 unfortunately much damaged. In every respect it agrees 

 with Kner's description. Lateral line 28. 



The difference in the dentition being merely one of degree, 

 and the fish agreeing in other respects so closely with the 

 other species of Plecostomus^ I doubt whether it is advisable 

 to separate it as a distinct genus {Cochliodon) . 



Loricaria Evansiij sp. n. (Plate I.) 



Teeth well developed in both jaws. Head a little longer 

 than broad, one fourth total length (without caudal) ; snout 

 obtusely pointed, with long bristles on the sides ; three short 

 keels on the back of the head ; postorbital notch scarcely 

 distinct; diameter of orbit one sixth length of head, two 

 sevenths length of snout, and two thirds interorbital space, 

 which is concave. Labial fold much developed, notched, 

 papillose, and with long cirrhi. Dorsal I 7, the first ray two 

 sevenths length of head, and just above the base of ventrals. 

 Anal 1 5. Pectoral I 6, a little shorter than head, extending 

 to base of ventrals. Ventral I 5, as long as pectoral, reaching 

 anal. Upper caudal ray produced in a long filament, half as 

 long as head and body. Lateral scutes 29, with two spinose 

 ridges meeting on the 19th ; nuchal scutes with spinose keels ; 

 20 scutes between dorsal and caudal, 17 between anal and 

 caudal ; breast and belly naked, but rough with minute 

 spines ; a series of seven or eight shields between pectoral 

 and ventral on each side of the thorax. Olive-brown above; 

 a dark band across the nape, and four others between the 

 dorsal and caudal fins ; fins with black spots. 



Total length 205 millim. 



