198 Field Columbian Museum — Zoology, Vol. V. 



pressed; head small, mouth rather large, oblique, the maxillary 

 reaching past anterior margin of the eye; snout bluntish, 4^2 in head; 

 premaxillary not protractile; gill membranes not united, free from the 

 isthmus; pectorals large, almost as long as the head; ventrals close 

 together, 1 % in head ; preopercle entire ; sides of head, breast, and nape 

 naked; lateral line straight, incomplete. 



Color light olive, sides tesselated with darker; 6 to 9 dark cross-bars 

 on back, traces of about an equal number on the sides ; a black humeral 

 spot; a dark streak downward and one forward from eye; soft dorsal 

 and caudal barred; spinous dorsal with some small dark dots. Length 

 about 2.10 inches. Females taken May 23 at Durango full of eggs, 

 evidently about spawning time. 



So far as known at present, this is the only darter found in a Pacific 

 coast stream. Its range is farther south than any member of the 

 family to which it belongs. 



Subgenus Oligocephalus Girard. 

 187. Etheostoma lepidum (Baird & Girard). 



Boleosoina lepida Baird & Girard, Proc. Acad. Nat.'Sci. Phila., 



1S53 , 338; upper tributaries of the Rio Nueces, Texas. 

 Pcecilichthys lepidus Jordan, Bull. U. S. Geol. Survey, 1878, 663; 



Brownsville, Texas. 

 Etheostoma lepidUm Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 



1896, 1089. 

 Lower Rio Grande and the streams of Texas, Indian Territory, and 

 Arkansas. 



Head 4^; depth 4^; D. ix, 11 to 13; A. 11, 6 to 8; scales 6-48 

 to 54-8. Body rather stout, compressed, tapering backward; head 

 sub-conical; mouth moderate, the jaws equal; maxillary reaching 

 vertical from anterior margin of the orbit; eyes large; first dorsal 

 rather low and somewhat connected to soft dorsal; no scales on head, 

 breast, or nape; lateral line incomplete; gill membranes not connected. 

 Color olivaceous, with some dark blue bars; scales dusky at base, 

 sometimes a slight trace of a humeral spot ; dorsal and caudal mottled 

 or barred. Length 2% inches. 



Family XVIII. Ceiitropomidse. 



The Robalos. 



Body elongate, compressed; dorsal region elevated; abdominal 

 region straight to angulated base of anal; head depressed, pike-like, 

 the lower jaw projecting; villiform teeth in bands on jaws, vomer, and 

 palatines; no teeth on tongue; maxillary broad, truncate behind, with 



