1908.] NATURAL SCIENCES OF PHILADELPHIA, 543 



larly convex, edges rounded. Caudal peduncle compressed, rather 

 slender, least depth 2| its length. 



Head compressed, rather pointed, flattened sides rather convergent 

 below, profiles similar, lower little more evenly and convexly inclined. 

 Snout rather conic, surface convex, length about equals its width. 

 Eye rounded, little high, near first f in head. Mouth moderate, little 

 inclined, jaw edges rather firm. Premaxillaries protractile. Maxil- 

 lary slender, to eye front. Lips rather thin. Mandible depressed, 

 rami not elevated inside mouth. Tongue depressed, fleshy, not free. 

 Nostrils together on side of snout, crescentic posterior larger. Inter- 

 orbital broadly convex. Preorbital Httle ovoid, width about f its 

 length, latter 1^ in eye. Preorbital width about equals pupil. Posterior 

 preopercle margin nearly vertical. 



Gill-opening forward little before hind eye ma^-gin, not quite to pupil. 

 Rakers about 2^-6? short weak points, longest i of filaments, latter 

 If in eye. Pseudobranchiae large, little smaller than filaments. Isth- 

 mus width at front IJ in pupil. 



Scales in series parallel with 1.1., all mostly broadly exposed, smaller 

 on breast and pre ventral, each with several striae. Ventral axil with 

 pointed scaly flap, 5 in depressed fin. L. 1. complete, decurved at 

 greatest depth to lowest third. Tubes simple, each well over exposed 

 scale not quite to edge. 



Dorsal origin midway between hind eye margin and caudal base, 

 fin highest anteriorly, depressed 1^ to caudal base. Anal origin just 

 behind dorsal base, fin highest anteriorly, depressed 2 to caudal base. 

 Caudal damaged. Pectoral rather long, upper rays longest, fin | 

 to ventral. Ventral inserted little before dorsal, depressed f to anal. 

 Vent close before anal. 



Color in alcohol dull brownish generally, back but little darker than 

 rest of general color. Sides and below silvery to whitish. Fins pale 

 brownish. Iris silvery. 



Length 2\ inches (caudal damaged). 



No. 4,035, A, N. S. P., cotype (type) of A. ruhrifrons Cope. Kiski- 

 minitas River (Cope). 



Also Nos. 4,036 to 4,039, same data, in poor preservation, showing : 

 Head 4 to 4^; depth 4f to 4f; D. iii, 7, i; A. iii, 9, i or iii, 10, i; 

 scales 30 to 37 + 2; scales above 1. 1. 6 or 7; scales below 1. 1. 4; pre- 

 dorsal scales 17 to 20; snout 3yV to 3^- in head; eye 3^^ to 3|; maxil- 

 lary 24 to 2|; interorbital 2| to 3; teeth 2, 4-4, 2; length 2j\ to 2^ 

 inches. 



Found in clear streams west of the Alleghanies. In life this fish is 



