490 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
spine. Maxillary barely reacliing- to opposite the large eye ; eyes high 
ui), sei)arated by a narrow, grooved space. Pectorals short, reaching 
tips of ventrals, half way to vent. Head 4^ ; depth 7. D. X-IO; A. 
I, 8; Lat. 1.- about 75, about C series of scales above it. L. 3 inches. 
Ohio valley and northwestward ; abounding in clear sandy streams ; one 
of the most interesting of our hshes. 
{Ethcoftioma pcUucidmn Baird MSS. ; rieurolejns pell ucklus Agsissiz, Bull. Mns. Comp. 
Zoill. i, 5, 18G:5: Plcurolepis pellucid'us Vaillaut. Reclierolies sur Etheostom. in Nouv. 
Arcliiv. Mus. 1874,138: Fleitrolepis 2 )ellucidus Jordan, MaiuYevt. ed.2, 219: Fleurolepis 
pellucidus Jordau &. Copeland, Amer. Nat. 1877, 86.) 
yes. A. aspB’cEJa, Jordan. 
Head long, rather slender. Eyes very large, high up and very close 
together. Mouth not large, sub-terminal, horizontal. Cheeks and oper- 
cles with pectinated scales. Opercular spine well developed. Squama- 
tion much more complete than in A. lyellucida, 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. 1). IX-10; A. I, 8; Lat. 1. 
98, ten series above the lateral line. L. 4 inches. Illinois to Alabama, 
in sandy streams; a much larger and rougher species than the preceding. 
{Fleurolepis (is^rrelliis .Jorcliiu, Bull. Ills. Lab. Nat. Hist. 2, 38, 1878: Fleurolepis as- 
prellus Jordan, Mau. Vert. ed. 2, 404.) 
253o — I© A Jordan & Bray ton. 
(Jordan & Brayton, Bull. U. S. Nat. Mns. xii, 88, 1878: type Foecilichthys vUreus Cope.) 
This genus diflers from Ammocn/pta chiefly iu the presence of two well- 
developed spines in the anal fin. The anal fin is i)roportionately smaller, 
and the scales are larger and rougher, more fully covering the body. 
The squamation of the head is moie complete than in any other genus. 
Species slender, translucent in life, (m?, an arrow or dart.) 
764. I. vitrca (Cope) J. & B. 
Form of Ammocrypta. Head slender, acuminate; mouth not very 
small; tem])oral region scaled; cheeks and opercles covered with large, 
imbricated, very roughly ctenoid scales, these scales extending forward 
to the maxillary and backward to edge of opercle and on suboperclej 
