490 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



spine. Maxillary barely reaching- to opposite the large eye; eyes high 

 up, separated by a narrow, grooved space. Pectorals snort, reaching 

 tips of ventrals, half way to vent. Head 4 ; depth 7. D. X-10; A. 

 I, 8; Lat. 1. about 7,"), about 6 series of scales above it. L. 3 inches. 

 Ohio valley and northwestward ; abounding in clear sandy streams ; one 

 of the most interesting of our lishes. 



(Elheoatoma pellucidum BairdMSS. : Pleurolepis pellucidve Aga&enz, Bull. Mus. Comp. 



Zool. i. .", l-ii:i: ricin-ol(-]iin 2)cUuciiliin Vaillant. Krrhrivlics sur Etheostom. in Nonv. 

 Arcliiv. Mus. 1S74, 138: Phnroh'p'iH pellundux Jordan, Man. Vert. ed. 2, 219: Pkurol<-jii>< 

 2)i'lltu-idt(s Jordan &. Copelaiid, Auior. Nat. 1877, 86.) 



763. A. asprella Jordan. 



Head long, rather slender. Eyes very large, high up and very close 

 together. Month not large, sub-terminal, horizontal. Cheeks and oper- 

 cles with pectinated scales. Opercular spine well developed. Squama- 

 tion much more complete than in A. pellucida, the scales small and 

 quite rough, largest posteriorly. Throat and belly naked, the space 

 between the ventral fins scaled. Back of neck scaly. Fins large, the 

 dorsals well separated; the spinous high, highest in front; second dor- 

 sal smaller, smaller than anal; anal spine high, flexible; caudal Innate. 

 Coloration clear olivaceous, sides with 8 to 10 dark squarish blotches, 

 quite small and far apart; a blackish shade forward from eye, and a 

 dusky shade across opercle. Said to present in life "almost all the 

 colors of the rainbow." Head 4i ; depth 8. I). IX-10; A. I, 8 ; Lat. 1. 

 OS, ten series above the lateral line. L. 4 inches. Illinois to Alabama, 

 in sandy streams; a much larger and rougher species than the preceding. 



(f'l<nr<ilc]>in (inprcllux Jordan, Bull. Ills. Lai). Nat. Hist. 2, 38, 187b : Plat rotcpin as- 

 prcllun Jordan, Man. Vert. ed. 2, 404.) 



253. IOA Jordan & Bray ton. 



(Jordan iV I'.rayton, Bull. IT. H. Nat. Mus. xii, 83, 1878: typo rai-ilichtlii/* ;/>< Cope.) 

 This ^eiius diil'ers from A in tn<HTi//>t chielly in the presence of two well- 

 developed .spines in the anal tin. Theanallin is proportionately smaller, 

 and the scales arc larger and rougher, more fully covering the body. 

 The sqnamation of the head is moie complete than in any other genus. 

 .slender, translucent in life. (;'^, an arrow or dart.) 



761. I. vilivn (Cope) J. A B. 



For ..... f .\iiiiii<>ci-i//>/<i. Head slender, acuminate; mouth not very 

 small; temporal region scaled; cheeks and opcrcles covered with large, 

 imbricated, very roughly ctenoid scales, these scales extending forward 

 to the maxillary and backward to edge of opercle and on suboperclej 



