294 ME. C. TATE REGAN ON THE 



diameter of eye 9 times, interorbital width 5-g- times, length of snout 14 times. Snout 

 obtuse. Teeth rather weak, 2 on each side in the upper jaw, 5-6 in the lower. 

 30-32 scutes in a lateral series, 14-15 + 15-18. Abdomen naked except for the lateral 

 series of plates and a median strip of plates of moderate size. First dorsal ray as long 

 as the head ; pectoral spine extending to base of ventral. Breadth of body at level of 

 first anal ray about 4f times in the distance from the latter to the caudal. Head and 

 body with numerous small dark oblong spots ; dorsal, pectoral, and caudal fins with 

 similar dark spots. In other characters similar to L. cataphracta. 



The typical example described by Steindachner is 210 mm. in total length. 



R. Mamoni, near Chepo, Panama. 



37. LOKICARIA MACROMYSTAX. 

 Loricaria macromystax Giititk. Proc. Zool. Soc. 1869, p. 426, figs. 5 & 6. 



Head If times as long as broad, its length nearly 4 times in the total length. 

 Diameter of eye 7-g- times in the length of head, interorbital width 6 times, length of 

 snout If times. Orbit with a shallow notch ; supraoccipital with a pair of very 

 indistinct keels ; snout laminar, considerably produced, with broad rounded apex ; 

 upper jaw with 5 or G small teeth on each side, lower jaw with 8 or 9 ; lower lip with 

 long fringes ; barbel extending nearly to middle of pectoral. 31 scutes in a longitudinal 

 series, 17 + 14, the lateral keels very weak and completely united posteriorly. Lower 

 surface of head naked except for the marginal plates ; space in front of the gill-opening 

 not covered with plates ; abdomen covered with small irregular plates which are more 

 numerous anteriorly; a lateral series of 10 plates between pectoral and ventral. First 

 dorsal ray equal to f- the length of head ; pectoral spine not reaching base of ventral ; 

 upper caudal ray probably elongate. Breadth of body at level of first anal ray 

 3f times in the distance from that point to the caudal. Olivaceous, without distinct 

 markings. 



*&" 



Total length 155 mm. 



'6 



One specimen from the Peruvian Amazon. 

 38. Loricaria lamina. 



Loricaria lamina Giinth. Proc. Zool. Soc. 1868, p. 239, figs. 6 & 7. 



Head a little longer than broad, its length 4f times in the total length. Diameter 

 of eye about 10 times in the length of head, interorbital width 5^-5^ times, length of 

 snout 1* times. Orbit with a shallow notch ; supraoccipital with a pair of almost 

 obsolete keels ; snout laminar, with a broad rounded apex ; upper jaw with 5 or 6 

 small teeth on each side, lower jaw with 7 or 8 ; lower lip with long fringes ; barbel 

 extending to the outer angle of the gill-opening. 32-33 scutes in a longitudinal 

 series, 154-17-18, those in front of the dorsal with very indistinct or obsolete keels, 



