244 MEMOIRS OF THE CARNEGIE MUSEUM 



Loricaria dura Bleeker, "Silures de Suriname," 1864, 18. 



One specimen, 119 mm. Creek in Mora Passage. (C. M. Cat. No. 1503.) 

 One specimen, 112 mm. Mud-flats, Demerara. (I. U. Cat. No. 11938.) 

 One specimen, 85 mm. Crab Falls. (C. M. Cat, No. 1516.) 

 Head 5, width of head 1.5 in its length; eye 6 in the head, equal to interorbital; 



snout a little more than 2 in the head; width of first anal ray 2.6 in its distance from 



the caudal; scutes 8 + 15, the keels remaining distinct to the caudal. 



Occipital with two keels ending in rather strong spines behind; two nuchal 



plates keeled, other plates in front of the dorsal keeled. Eye with a shallow notch. 



Lower surface of head naked. 



Three long graduated teeth on each side of the upper jaw, seven much smaller 



ones on each side of the lower jaw. Lips with short warts about the mouth, other- 

 wise with numerous long tentacles; free portion of the barbels much longer than 



the eye. 



Anal plate in the largest specimen composed of four plates, ventral buckler 



of about seventeen plates imperfectly joined. Three to eight plates between the 



lateral plates, depending on the position. 



Pectorals slightly emarginate, reaching past origin of ventrals; outer ventral 



ray prolonged, reaching to or beyond origin of last anal ray. Anal obliquely rounded. 



Upper caudal ray greatly prolonged, 180 mm. in length in a specimen 109 mm. 



long to base of caudal. Upper surface and fins reddish brown, caudal filament 



banded. 



Loricariichthys Bleeker. 



Loricariichthys Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 80 (maculatus). 

 Parahemiodon Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 80. 

 Rineloricaria Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 81 (lima). 



Type, Loricaria maculata Bloch. 



Distinguished from Loricaria by its papillose lips. 



Key to the Guiana Species of Loricariichthys. 

 a. Upper lip interrupted in the middle. A single series of plates between the lateral scries of the belly; 

 teeth very minute, twenty or more on each side of the lower jaw; ventral buckler formed of six 



plates; pectorals truncate. {Loricariichthys.) microdon. 



aa. Upper lip well-developed. Two or more series of plates between the lateral plates of the belly; teeth 

 twelve or fewer on each side of the lower jaw: ventral buckler formed of seven to sixteen plates. 

 (Rineloricaria.) 

 b. Xo keels on head or on the plates in front of the dorsal: usually two series of plates between the 



lateral scries on the middle of the belly: sand-color, lower surface plain griseus. 



bb. Keels of the plates in front of t lie dorsal more or less evident ; three or more series of plates between 

 the lateral plates of the belly; a dusky area or spot on either side of base of first anal ray. 



