85. PERCID,E ETHEOSTOMA. 513 



being so different in respect to the form of the mouth, that he conceived that they 

 might belong to different subgenera. The etymology of the word is not evident.) 



. Head entirely naked; lateral line short; lower jaw prominent. 

 6. Body with longitudinal dark stripes. 



8 J3. E. liBseolatsnnn (Ag.) Jor. Striped Darter. 



Body elongate, compressed, the back scarcely arched. Head long 

 and rather pointed, entirely destitute of scales. Month rather large., 

 terminal, oblique, the lower jaw the longer. Eye moderate, longer than 

 the snout, about 4 in head. Opercular spine strong. Fins all low, the 

 first dorsal in the males about half as high as the second; higher in the 

 females; caudal large, rounded. Anal spines longer in females than in 

 the males; dorsal and anal spines pointed in the female, in the male with 

 thickened fleshy tips. Scales moderate. Lateral line extending about 

 to end of first dorsal. Neck and throat naked ; scales on sides extending 

 up to the base of the dorsal fin. Color dark; each scale with a dark 

 spot, these forming a series of conspicuous longitudinal lines along the 

 rows of scales; second dorsal and caudal conspicuously cross-barred; 

 head blackish, with dark stripes radiating from eye; males further 

 marked with conspicuous dark cross bars. Head 4; depth 5. D. VIII- 

 12; A. II, 8; scales 7-53-7. L. 2J inches. Minnesota to Indiana; abound- 

 ing in clear or rocky streams; one of the most singular and handsome 

 of the darters. 



(Catonotits lineolatus Agassiz, Arner. Journ. Sci. Arts. 1854. 305: Catonotus lineolatus 

 Vaillant, 1. c. 118. ) 



bb. Body not striped. 



8O4. E. flabellare Raf. 



Very similar to the preceding, but rather more elongate and less 

 compressed. Head rather larger. A narrow strip along base of spinous 

 dorsal not scaled. Coloration paler, there being little or no trace of the 

 longitudinal stripes, so conspicuous in E. lineolatum; the males with cross 

 blotches, the iemales nearly plain olivaceous; second dorsal and caudal 

 fins barred; b'ack humeral spot conspicuous. Lateral line usually vei y 

 little developed ; lower jaw less projecting than in E. lineolatum. Head 

 4; depth 5. D.VIII-12; A. II, 8 ; Lat. 1. 46. Length 2 inches. West- 

 ern New York to Ohio Valley and North Carolina; very abundant in 

 the tributaries of Lake Ontario. 



(Rafinesque, Jouru. de Phys. etc. Paris, 1819,419: Catonolus flabelUtm Vaillaut, 

 Recherches, 1873, 1-21: Catonolus fasciatus GirarcT, Proc. Acad. Nat. Sci. Phila. 185 ( J, G7: 

 Oligocephalus humeralis Girard, Proc. Acad. Nat. Sci. Phila. 1859, G6: ? Catonotus 



Bull. Nat, Mus. No. 1C 33 



