502 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



uected. Lateral line straight, prolonged forwards to the eye. Opercles 

 with rather large scales ; cheeks covered with very small ones, which 

 are scarcely visible; breast naked; neck naked, or more or less scaly; 

 body otherwise entirely scaly, the scales small and rough. Straw-yel- 

 low or greenish, with dark tessellations and marblings above, and about 7 

 large dark blotches along the sides, which are partly confluent, thus form- 

 ing a moniliform baud ; tins barred. Head 4 ; depth G. D. XIII to XV- 

 1L> ; A. II, 9 ; scales 9-65-17. Ohio River to the Upper Missouri, chiefly 

 northward; one of the most curious and elegant of the darters. Its 

 coloration varies much in intensity with differences in surroundings. 

 Specimens from the Ohio Valley slenderer than the typical form, with 

 narrower head, scaly neck and paler colors, form a slight variety ap- 

 proaching A. phoxocephalus. 



(Etheoatoma blcnnhides Kirtland, Bost. Jonrn. Nat.Hist. 1839, 340 not of Rafinesqne : 

 Ethcostoma Menu hides Vaillaut, 1. c. 57 ; Cope &. Jordan, Proc. Acart. Nat. Sci. Phila. 

 1877, 51: Alvordiux maculatus Jordan, Mail. Vert. ed. 2, 220, probably uot of Girard, 

 who describes the bead as scaleless.) 



74. A. ncvBsensis (Cope) Jor. 



" This is an elongate fish, with muzzle obtuse in profile, as well as wide, 

 viewed from above. Cheeks, operculum, and middle dorsal line scaled. 

 Ventral line without spinous scales ; one only being present in the sym- 

 physis of the ' coracoids'. Anal fin with base a little shorter than .spi- 

 nous dorsal; the species may really be a PcrciUchthys. First dorsal 

 moderately elevated ; second, peculiar in spinous ray, well separated 

 from the first dorsal. Caudal fin slightly forked. Ground color above 

 yellowish, crossed by 9 dark chestnut quadrate spots on the median line, 

 which arc wider than their interspaces and arc connected at their cuds 



| 



by an undulate chestnut baud. Below the latter a similar longitudinal 

 band on the anterior half of the body. Six quadrate black spots on the 

 sides, with a small spot between each. A dark band from end of muz- 

 zle to scapula ; below it on operculum, a silver spot. A blade bar below . 

 eye. Kelly white. Caudal and second dorsal distinctly, pectoral and 

 ventral faintly black barred. A series of black spots along middle of 

 lirst dorsal." Head \\ depth -1?. I>. XIII-I, ll': A. IF,S; scales 8-53- 

 11. L. :'>',. (('<>i><'.) Maryland to North Carolina. 



i llii,lri>iitfriix iniifiil/ilHH* Grd, Proc. Ae;id. Nat. Sci. Pliila. 1SV.I; not .tlr. inai-iiltitii* 

 (iid. : l-:Hn-Hxtnnin in rixi uxr Cope, Proc. Anier. Pbilo.s. Soc. Phila. !-?<>, -Jill.) 

 bbb. (Mieeli.-, 1 1. -i K I'd ; operelesseah ;i 1 .< .\ e mil y ; space l>r fui i- dorsal naked ; muzzle blunt. 

 d. Ventral shield* mu<lrr;i!<- : <-<>!ors dull, plain. 



*Tho types of lhi> speeies, lately examined by us, seem to be idem tea I \t itli .1. nen- 

 sensis ; cbeeks with rat her lar^e scales ; middle of breast with scales; ventral plates 

 large. Scales 7-56-12. D. XIV-1'2 ; A. II, 9. Maryland. 



