1908.] NATURAL SCIENCES OF PHILADELPHIA. 545 



Length 1|- inches. 



No. 22,280, A. N. S. P., cotype (type) of S. photogenis Cope. 

 Youghiogheny River (Cope), Pa. 



Also No. 22,281, same data, showing: Head 3f ; depth 5; D. iii, 

 7, i; A. iii, 8?; scales 33? + 3?; scales above 1. 1. 6; scales below 

 1. 1. 4; predorsal scales 14?; snout 3^ in head; eye 2|; maxillary 3^; 

 interorbital 3; length 1-^ inches. Both examples in poor preservation. 



Found in streams west of the Alleghanies and said to reach 3 inches 

 in length. 

 Notropis photogenis amoenus (Abbott).' 



Head 3f to 4^; depth 4| to 5f ; D. usually iii, 7, i, rarely iii, 8, i; 

 A. usually iii, 10, i, occasionally iii, 9, i, rarely iii, 11, i; scales 

 usually about 38, though ranging from 31 to 40 + usually 2, frequently 

 3, rarely 1; scales above 1. 1. usually 7, seldom 6 or 8; scales below 

 1. 1. 4; predoi-sal scales usually 18 to 21, seldom 17, 22, 23 or 24; snout 

 3 to 3* in head; eye 2f to 3^; maxillary 2f to 3^; interorbital 2f to 

 3yV; teeth 2, 4-4, 2. Body compressed, slender. Head compressed. 

 Snout convex, length |- its width. Eye rounded, rather high. Mouth 

 well inclined, moderate, mandible included evenly. Maxillary to eye. 

 Interorbital broadly convex. Rakers 2 + 6 short weak points. 

 Scales rather broadly exposed, crowded on predorsal region. L. 1. 

 complete, decurved about lowest third. Dorsal origin midway between 

 eye and caudal base, i^nal origin below last doreal ray base. Caudal 

 long, deepl}^ forked. Pectoral | to ventral. Ventral inserted little 

 before dorsal, fin f to anal. Color translucent olive on back, sides and 

 below silvery- white. Leaden streak along side sometimes, offsetting 

 color of back and belly, extending from eye to caudal, where little 

 darker. Iris silvery-white. Length 1| to 3|- inches. Many examples : 

 from the Delaware R. basin at Holmesburg (Philadelphia Co.) ; Nesham- 

 iny Falls, Hulmeville, Bristol, Emilie (Bucks Co.); Dingman's Ferry 

 (Pike Co.): Susquehanna R. basin at Paradise and Swamp Bridge 

 near Denver (Lancaster Co.). 



Found only in the lower Delaware and Susquehanna basins by me. 

 It was especially abundant in the Neshaminy Creek and also occurs 

 rather frequently in the Delaw^are tide-water. It is a beautiful bright 

 silvery little minnow, and is said to reach 3| inches. It seems to differ 

 from N. photogenis chiefly in the smaller predorsal scales. I have 

 usually found it associated with large schools of other minnows or 

 small fishes. 



' Cope records N. umhratilis ardens (Cope) from west of the Alleghanies, 

 evidently hypotheticalh^, as no definite locahty is mentioned. 



