1899.] NATURAL SCIENCES OF PHILADELPHIA. 181 



7. Nemacliilus dixoni sp. nov. 



Head, 4^; depth, 6^; D., 7; A., 6. Body moderately elongated 

 rounded anteriorly and much compressed along the caudal peduncle. 

 Eye placed above and anterior to the centre of the head. Eye 6 

 in head and 2^ times in the interorbital space. Six barbels around 

 the upper jaw, the posterior pair reaching beyond the posterior 

 margin of the eye. Snout furnished with a pair of nasal barbels 

 placed laterally, they are formed over the apertures of the anterior 

 nares and extend to the centre of the orbit. The posterior nares 

 are placed in front and above the centre of the eyes. Lips fleshy, 

 the lower without barbels. Origin of the dorsal falling behind 

 that of the ventrals. In the space between the base of the pectoral 

 and the ventral fins the length of the pectoral is contained about 

 2^ times. Anus below the hind edge of the dorsal. Rudimentary 

 caudal rays well developed. Caudal nearly as long as head, 

 rounded. Color in alcohol olivaceous, dusky above, whitish below. 

 A lateral streak the same color as the top of the back and a jet- 

 black spot in the centre of the base of the caudal. Dorsal and 

 caudal with numerous fine dark-brown spots. Remaining fins less 

 distinctly spotted with the same color as the sides, which, together 

 with the upper parts, are also spotted with darker spots than the 

 ground color. Scales small and indistinct. Lateral line imperfect. 

 Total length, 2^| inches. One specimen, No. 16,393. 



8. Nemachilas pechiliensis sp. nov. 



Head, 4|; depth, 6f; D., 8; A., 6. Body somewhat long and 

 compressed. Eye 9 in head, 1^ in the distance from its frontal 

 margin to the anterior nare. The anterior nares are closer together 

 than the posterior pair. Six barbels around the upper jaw. Lips 

 rather thin. Pectoral nearly as long as the dorsal or caudal, and 

 reaching half-way to the ventrals. Ventrals beginning a little 

 in advance of the origin of the dorsal. Anal tube prominent 

 from the ventrals to the aperture in front of the anal fin. 

 Rudimentary caudal rays well developed. Caudal truncate. 

 Color in alcohol olivaceous — dusky above, grayish -white 

 below. Back and upper parts of the sides of the body, with 

 flakes of dusky which are not numerous, and are somewhat irregu- 

 larly distributed. Dorsal with dusky spots. Several indistinct 

 broad dusky stripes on the caudal. Other fins like the belly in 



