1908.] NATURAL SCIENCES OF PHILADELPHIA, 541 



inches. The red fin is frequently found in rock pools about cascades, 

 and seems perfectly at home in turbulent foamy water. They are 

 frequently angled on a small hook, and though palatable as a pan fish 

 are usually too small to be of any value. As bait they are excellent. 

 It occurs usually in the smaller streams, being entirely distributed over 

 our region. I have not yet taken it in tide-water. 

 Notropis ohalybaeus (Cope).^ 



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

 8, i; scales usually 30, frequently 31, often 29, 32, 33, 34, 35, rarely 

 28, 36 or 39 + usually 2, seldom 3, rarely 1; scales above 1. 1. usually 

 6, occasionally 7, rarely 5; scales below 1. 1. usually 4, seldom 3, rarely 

 5; predorsal scales usually 15, frequently 14, 16 or 17, rarely 13 or 18; 

 snout 3 to 4^ in head; eye 2^ to 3^; maxillary 2f to 3f ; interorbital 

 2y to 3; teeth 2, 4-4, 2. Body well compressed, heavy forward. 

 Caudal peduncle slender. Head compressed. Snout convex, length 

 I its width. Eye rounded, high. Mouth inclined, mandible slightly 

 protruding. Maxillary to eye. Interorbital broadly convex. Rakers 

 3 + 6 short slender points. Scales well exposed. Predorsal scales 

 slightly smaller. L. 1. complete in adults, incomplete in young. 

 Dorsal origin about midway between front nostril and caudal base. 

 Anal inserted little behind dorsal base. Caudal forked. Pectoral 

 I to ventral, latter inserted trifle before dorsal origin, fin reaches vent. 

 Color dark brown, scales dark-edged on back. Black lateral band from 

 snout to caudal base, purple, blue or green in some lights, and ending 

 in black caudal blotch. Just over this a light brownish streak and 

 within none of scales dark-edged like back above. Below whitish. 

 Length 1^ to 2y\ inches. Many examples from the Delaware R. basin 

 in Mill Creek at Bristol and the Neshaminy Creek at Neshaminy Falls 

 (Bucks Co.). 



This is a very brilliant little fish in full breeding-dress, the lower 

 surface of the body and pale area of brown adjoining the black lateral 

 band being rich orange. This is only the case with the male, which is 

 also covered with ininute tubercles rather sparsely over the upper 

 surface of the head, though much larger on preorbital and mandible. 

 All of predorsal scales edged rather coarsely with corrugations or 

 tubercles. The females lack the tubercles, and may easily be known 

 at this time by their swollen abdomens, due to being gravid Avdth ova. 

 They all associate with other small fishes in rather still or quiet water, 

 usually in large schools of several hundred individuals, and are largely 



' Cope includes N. scabriceps (Cope) from our limits, in western Pennsylvania, 

 hvpothetically 

 35 



