JORDAN ON FISHES OF THE RIO GRANDE OF TEXAS. 665 



Examination of larger and better-preserved specimens of the species 

 referred to on page 402 as Pimephales promelas shows that they do not 

 truly belong" to that species, but to Professor Cope's Eyhorhynchus nigel- 

 lus. In my opinion, the group called Pimephales and Syhorhynchus 

 can no longer be regarded as distinct genera. The present species has 

 entirely the appearance of Pimephales; in fact, it carries the peculiar 

 form and coloration of that genus to an extreme. Its lateral line is, 

 however, almost as complete as in Hylorhynchus. The tubes are, how- 

 ever, entirely wanting on the last four or five scales, and irregularly so 

 on some of the scales along the sides. The description given by Pro- 

 fessor Cope is entirely accurate. One of my specimens is, however, 

 still blacker, the whole dorsal fin and nearly the whole head being jet- 

 black. 



Genus CYPRINELLA Girard. 



Cyprinella complanata (Girard) Jordan. 



1856 — Montana complanata Girard, Proc. Ac. Nat. Sc. Phila. p. 200, 



Montana complanata Girard, U. S. Mex. Bound. Surv. Ichtbyol. p. 56, pi. 31, f. 

 17-20, 1859. 



Moniana complanata Jordan & Copeland, Check List Fishes, -\}. 153, 1876 . 

 1856 — Moniana couchi Girard, Proc. Ac. Nat. Sc. Phila. p. 201. 



Moniana coucU Girard, U. S. Mex. Bound. Surv. Ichth. p. 57, pi. 30, f. 21-24. 



Moniana coucMi Jordan & Copeland, Check List Fishes, p. 154, 1876. 

 1856 — Moniana giblosa Girard, Proc. Ac. Nat. Sci. Phila. p. 201. 



Moniana gibbosa Girard, U. S. Mex. Bound. Surv. Ichthyol. p. 57, pi. 30, f. 9-12. 



Moniana gibbosa Jordan & Copeland, Check List Fishes N. A. p. 153, 1856. 

 1878 — Cyprinella buhalina Jordan, present paper, p. 403. 



Examination of additional specimens has shown me that the dental 

 formula, 1-4, 4-1, noticed on my first specimen, was i^robably accidental, 

 and that the reference of most or all of these deep-bodied Cyprinellce to 

 C. hubalina is erroneous. Girard's types of his gibbosa and complanata 

 were from Brownsville. My specimens agree fairly with the figures of 

 both, — decidedly best with gibbosa, however. The descriptions of both — 

 as of all his species of Moniana — are valueless. The younger specimens 

 agree well with the figure of il£ couchi, which, coming from the neigh- 

 boring province of New Leon, is very likely the same. I therefore unite 

 couchi, gibbosa, and complanata under the oldest name, complanata, 

 although, as above stated, the figure of gibbosa is the most satisfactory. 

 A characteristic color marking will probably usually distinguish what I 

 call complanata from related species. The membrane between the 

 branches of the lower jaw in most specimens bears a conspicuous black 

 spot. In a very few, however, this is silvery. Cyprinella forbesi, lately 

 described by me from Southern Illinois, is a closely related species, but 

 wants this spot, and is somewhat different in form. These small fishes 

 are exceedingly difficult, and until some one can study a large series of 

 fresh specimens representing the different species, any arrangement of 

 them must be regarded as merely provisional. Dr. Girard's treatment 



