1916.] \\li RAL SCIENCES OF PHILADELPHIA. 431 



mouth. Nostrils close above upper front, of eye ■ . small, simple. 

 Interorbital slightly convex. Preorbital about f area • Hind 



preopercle edge little free and nearly vertical, entire. 



Gill-opening adnate above to gill-opening close above oase of G 

 pectoral ray, and extends forward opposite hind pupil edge, Gill- 

 membranes widely connected across rather narrow isthmus. Rakers 

 about 26, short slender points about ^ length of gill-filaments, and 

 latter equal eye. Branchiostegals 4. 



Scales rather narrowly imbricated, largest on top of head and 

 opercles, smallest on breast and caudal base. Enlarged humeral 

 scale longer than eye. Scales in 2 rows on cheek. Lateral line 

 obscure and incomplete, formed as short arch of few pores parallel 

 with contour of back far as dorsal origin, a single pore on each scale. 



Dorsal inserted midway between centre of eye and caudal base, 

 median rays longest, and depressed fin extends § to caudal base. 

 Anal inserted about opposite base of fifth branched dorsal ray, fin 

 extending f to caudal base when depressed. Caudal with hind edge 

 slightly convex. Pectoral long, reaches back well beyond ventral 

 origin, latter little before dorsal, and fin reaching vent, which close 

 before anal. 



Color of male, in alcohol, uniform brownish on back and upper 

 surface of head. Sides and lower surface whitish. Fins all pale 

 brownish, and except ventrals densely punctate darker as seen under 

 a lens. Iris pale brownish. 



Length 53 mm. 



Type, Xo. 20,266, A. N. S. P. Brazos River, between Seymour 

 and Authon, Texas. Collection of W. S. Black. E. D. Cope. 



Also large series, Nos. 20,267 to 20,324. A. N. S. P.. paratypes, 

 same data. They show: Head 3 to 3|; depth 2f to 3; D. usually 

 i, 9, rarely I, 8; A. I, 9 or I, 10; scales 25 to 29 in median lateral 

 series to caudal base and 3 or 4 more on latter; 12 to 14 scales trans- 

 versely between dorsal and anal origins; snout 3 to 4 in head measured 

 from upper jaw tip; eye 2| to 3; maxillary 2| to 3|; interorbital 

 2| to 2|; length 33 to 45 mm. Most of this series females, and 

 differing from the male in having , six or seven vertical wide cross- 

 bars of dark brownish on trunk. These all more or less variable. 

 Very pale brownish vertical streak at base of caudal. Outer hind 

 portion of caudal with vertical submarginal dusky streak to median 

 rays, though hind edge of fin narrowly pale. Often dorsal and anal 

 ratherdark, though former mostly uniform. Young examples colored 

 like females, variable. 



