18&'').] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 3 



8. Pimephales promelas, Rafiucsquc. 



(Coiiscus parietalis, Cope, Hayden's Geol. Survey Wyo., 1872, 437.) 



Many specimeDS taken iu Village Creek and in the bayous. These 

 agree i'ully with Cope's description of Coliscus parietalis, and differ con- 

 siderably in appearance from the adult of Pimephales promelas. On 

 comparison of our specimens with large series of the latter species we 

 find what appears to be a complete gradation, and we have no doubt 

 that Coliscus is simply the immature form of Pimephales. 



In life, light green above, the scales edged with darker; a plumbeous 

 band formed of dark points along the side, ending in a faint spot at 

 base of caudal ; a dusky dorsal streak ; a dark dash on upper part of 

 opercle. Fins plain, the caudal a little yellowish, with some dark 

 jwints. 



Body more elongate than iu the adult Pimephales, the head less 

 deep. Caudal peduncle very long. Fins small. Scales small, crowded 

 above ; lateral line appearing on some 5 to 15 scales. Dorsal fin in- 

 serted above ventrals. 



Head 4J ; depth 4f . Scales 43. Teeth 4-4, scarcely hooked. Intes- 

 tines long. Peritoneum black. Mouth small, oblique, as in Pimephales. 



9. Pimephales notatus, Rafinesque. 

 Common. 



10. Cliola vigilax, Baird and Girard. 



(Ceratichthys vigilax, Baird and Girard, Proc. Ac. Nat. Sci., Phila., 1853, 390. 



Cliola velox, Girard, 1. c, 1856, 192. 



Cliola vivax, Girard, 1. c, 185(5, 192. 



Hyhopsis tiiditanus, Cope, Trans. Amer. Phil. Soc, Phila., 1866, 381. 



Alhurnopa laurocephalus, Hay, Proc. U. S. Nat. Mus., 1880, 503. 



Hypargyrus tuditanus, Gilbert, Proc. U. S. Nat. Mus., 1884, 200.) 



Examination of a very large series of specimens of this widely dis- 

 tributed and very abundant species in the National Museum leaves no 

 doubt that all the above names refer to a single species. Among these 

 are the types of Cliola vivax and Alburnops taurocephalus, as well as 

 that of Professor Gilbert's description above cited. As this species is 

 the original type of the genus Cliola, that name becomes equivalent to 

 Hypargyrus, Forbes, and must be used for this group if its separation 

 from Notropis be approved. Our specimens agree well with Gilbert's 

 description. 



In life, light green above, the scales slightly edged with darker ; a 

 distinct plumbeous lateral band, narrower than in Pimephales notatics; 

 a distinct round black spot at base of caudal. Belly silvery. Fins 

 mostly creamy, the dorsal with a sharply-defined black spot in front, 

 surrounded by yellowish. 



As already noticed, this species bears much resemblance to Pimepha- 

 les notatus. It has, however, a more terminal mouth, with the gape 

 slightly oblique. Its coloration is paler, with the dark markings, es- 



