H4 



corjioralis, Cope. Jonni. Ac. Nat. >Sc. Fhilad. XIII, p. 



M2, pi. 10, fig. 2. ' ^ 



Leucosomus corporali'^, Cluentlij VII. 2G'J. 



Occurs ill tlie upper Potomac, in Montg-orueiy aiul rreJe- 

 a-ick counties , but seems to l^e scarce. 



Acad. Coll. S. I. 



CERATICHTYS, Baird & Girard. 



C. bignttatus, 



This is a cylindrical, stout fisli, with large scales; its head 

 enters three and three fourths times into the length to the 

 orio'in of the caudal fin . It is brownish cream-colored, shaded 

 with slate above the lateral line, where the scales are tipped 

 and margined with the same. Length, G inches. 



Fin-rays:— D. 1.8; P. 15; V. 8; A. 'Z ; C. 19. 



C. higutf((ff'-x, Kirtland, Post. Journ. Nat. Hi.st. Ill, 184U, 

 p. 344." 



Leuciso's hi'/utfafxs, DeKay, New Yoidc Fauna, Fisli, p. 

 214. 



Ceraticlithys higuttatus, Cope, Jonvn. Acad. -Nat. Sc. Philad. 

 XIII, p. 3G6, pi. II, fig. 5. 



Common in many of the smaller streauis of tlie central dis- 

 ;tricts of the Western shore. 



It is much esteemed in the regions where it lives, and beiug 

 fried crisp with other small Cyprinnidw forms a very enjoyable 

 dish of food. 



It is becoming exterminated in several cf tlie streams near 

 Baltimore. 



Acad. Coll. S. I. 



ARGYREUS, Ileckol. 



1— A. alronasus. 



Black-nosed Dace, or Brook Minnow. 



Body oblong, cylindrical, tapering; head small, flattened. 

 .In summer and autumn it is brownish olive above a black 

 •band, which extends around the nose to the origin of the cau- 

 dal fin, and satin white below. In spring the latter region 

 becomes vermilion red, and the lateral band assumes an 

 orano-e hue; the pectoral and ventral fins become .similar to 



