520 PROCEEDINGS OF THE ACADEMY OF [DeC, 



be very active, and not very abundant anywhere. The above example, 

 obtained by Cope, is the only one I have from our limits. 

 Chrosomus erythrogaster eos (Cope). 



C. eos Cope, Proc. Acad. Nat. Sci. Phila., 1861, p. 523. Meshoppen Creek, 

 Susquehanna Co. 



Head 3f; depth 4f; D. iii, 7, i; A. iii, 7, i; P. i, 15?; V. i, 8; 

 scales 80? + 5?; 24? scales transversely from dorsal to middle of belly; 

 50? predorsal scales; head width 2 its length; head depth If; mandible 

 2f ; first branched dorsal ray If; anal ray If; upper caudal lobe 1-^; 

 least depth of caudal peduncle 2f ; pectoral If; ventral 1^%; snout 

 4i in head measured from upper jaw tip; eye 3^; maxillary 3f ; inter- 

 orbital 3. 



Body elongate, compressed, edges convex, profiles apparent!)^ 

 about evenly fusiform, deepest midway in length. Caudal peduncle 

 compressed, least depth about 1^ its length. 



Head moderate, robust, compressed, above rather broadly convex, 

 lower profile more inclined convexly. Snout surface broadly convex, 

 length about f width. Eye large, circular, about first f in head. 

 Mouth well inclined, oblique, gape curved, closed mandible slightly 

 protruding. Maxillary narrow, mostly concealed by preorbital, 

 exposed end almost to eye. Mouth moderately small, jaw edges rather 

 blunt and not especially hard. Lips thin. Tongue thick, fleshy, 

 rounded, scarcely free. Nostrils together on snout above, about last 

 third its length, posterior larger, anterior with cutaneous rim. Inter- 

 orbital broad, slightly evenly convex. Preorbital width about f its 

 length, latter 1^ in eye, lower margin convex. Lower posterior pre- 

 opercle corner rather evenly convex. 



Gill-opening last f of head. Rakers reduced, short small fleshy 

 points. Filaments about j of eye. Pseud obranchiae little shorter 

 than filaments. Teeth 5-5, elongate, compressed, tips hooked, 

 grinding-surfaces narrow. 



Scales small, cycloid, in nearly even horizontal series, considerably 

 smaller along dorsal and ventral body edges. Scales on caudal base 

 little reduced. L. 1. incomplete, on flrst few scales, curving down little 

 below middle of side. Tubes simple, persisting to each scale edge. 



Dorsal origin about inidway between hind eye margin and caudal 

 base, first branched ray highest, last about f of first. Anal inserted 

 about midway between pectoral medianly and caudal base just behind 

 dorsal base, first branched ray highest, fin rounded like dorsal. Caudal 

 emarginate, pointed lobes about equal. Pectoral pointed, upper rays 

 longest, f to ventral. Ventral inserted little before dorsal origin or 



