1910.] NATURAL SCIENCES OF PHILADELPHIA. 279 



inches. Six example; from the Catawba River, N. C. Cope records 

 these as Hybopsis amarus. Comparing his key, the head is given as 

 4, that of -V. hudsonius amarus as 4^, a character of no importance. 

 He gives teeth for saludanus 1, 4-4, 1, and for amarus 2, 4-4, 2, 

 stating that only the upper outer tooth is hooked and furnished with 

 a grinding-surface and the others are obtuse. I find these characters 

 to vary in most all degrees in both forms, except the number of teeth 

 in the inner row, which seems to be constantly 1 in saludanus, though 

 other material may show variation. Some of these latter show all 

 the larger teeth hooked. I find it differs from amarus in the rather 

 shorter thicker body, rather fewer predorsal scales, inner pharyngeal 

 tooth either absent or only 1, and usually only upper tooth hooked 

 and with grinding-surface as the others often obtuse, though this 

 apparently a condition of age as in the smaller examples all have 

 been found hooked. 



Notropis formosus (Girard). 



Montana formosa Girard, Proc. Acad. Nat. Sci. Phila., 18.56, p. 201. Rio 

 Membres, Mex. 



Head of; depth 3£; D. hi, 7, i; A. hi, 7, i; scales 44 + 2; 8 scales 

 above 1. 1. ; 5 scales below 1. 1. ; 21 predorsal scales; snout 3% in head; 

 eye 3+; maxillary 2 T 9 o-; interorbital 2*; teeth hooked, grinding- 

 surfaces moderate, 4-4; length 2ts inches. Cotype of M. formosa. 



Notropis frigidus (Girard). 



Montana frigida Girard, Proc. Acad. Nat. Sci. Phila., 1856, p. 200. Trib. 

 Rio San Antonio and Rio Neuces. 



Head 3| to 34; depth 2| to 3f; D. hi, 7, i; A. iii, 8, i; scales 33 

 to 36 + 2 or 3; 7 scales above 1. 1.; 4 or 5 scales below 1. 1. ; 16 pre- 

 dorsal scales; snout 3| to 3* in head; eye 3f to 4; maxillary 24 to 3f ; 

 interorbital 2\ to 2\; teeth ?-4, grinding-surfaces rather narrow; 

 length 21r to 2f inches. Two cotypes? of M. frigida. Rio Salado 

 (Clark?), Tex.? S. I. "2978." Very likely these are from the lot 

 of 100 obtained in the Rio Salado, though no number is given by Girard. 



NotropiB lutrensis (Baird and Girard). PI. XVI, fig. 16; PI. XVII, figs. 17-21. 



Cyprinella -sauvis Girard, Proc. Acad. Nat. Sci. Phila., 1856, p. 197. Near 



San Antonio, Tex. 

 Montana Icetabilis Girard, I. c, p. 200. Hurrah ('reck, trib. Rio Grande. 

 -1/. pulchella Girard, /. c. Sugar Loaf Creek, Tex. 

 M. rutila Girard, /. c, p. 210. Cadereita, Mex. 

 .1/. couch i Girard, /. c. Near China, New Leon, Mex. 

 M. gracilis Girard, /. c. Near Monterey, Mex. 

 Cyprinella billingsiana Cope, Rep. U. S. Geol. Sur., 1870 (1871), p. 439. 



St. Joseph, Mo. 

 Montana jugalis Cope, /. c. St. Joseph, Mo. 

 Cliola montiregis Cope, Proc. Am. Philos. Soc. Phila., NNII, 1885, p. 168. 



Monterey, Mex. _, 



