1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM- 9 



2. Amiurus melas, Eafiueeque. 



3. Catostomus teres, Mitchill. 



4. Pimephales promelas, Rafiuesque. 



Adults brassy olive, the head blackish. Pectoral and caudal dull 

 leddish. Dorsal with a large black spot on the anterior rays. Several 

 young specimens (" GoUscus") also taken. 



5. Notropis deliciosus, Girard. 

 Common. 



6. Notropis gilberti, Jordou «& Meek. 



7. Notropis lutrensis, Baird & Girard. 



{Leuciscus lutrensis, Baird & Girard, Proc. Acad. Nat. Sci. Phila., 1853, 391. 

 Moniana gihhosa, pidcliella, coucM, rutila, and gracilis, Girard, 1. c. 1856, 199-201. 

 Hypsilepis iris, Cope, Wheeler's Expl. W. lOOth Mer. v, 653, 1876.' 

 Moniana j II galis, Cope, Hayden's Geol. Surv. Wyo., l>-72, 439. 

 Cyprinella forbesi, Jordan, Bull. Ills. State Lab. Nat. Hist, ii, 57, 1878.) 



We have examined the tyi)ical examples of all the nominal species 

 above enumerated, as well as many other specimens from various streams 

 between Illinois and Mexico. We are uuable to point out any perma- 

 nent distinctive characters Avhatever among them, and regard all as 

 belonging to a single species. Considerable variation in form is shown 

 in au}' large series. The types of gihhosa and forbesi being very deep 

 (de])th more than ^ length), while other specimens (especially females) 

 are more elongate (depth | to ^ length). Similar variations occur in 

 Notropis megalops, Notropis icMppIei, and other widely diffused species. 

 Of the other species called by Girard " Moniana,''^ deliciosa, nitida, and 

 proscrpina., seem to be valid species, of the ^'stramineus^^ type. Aurata 

 is close to lutrensis^ having the head heavier, the mouth more inferior. 

 Frigida {=leoni7ia and complanata i)robably — these two lost) has rather 

 smaller scales (lat. 1. 37) and the body more elongate. Lcetahilis and 

 formosa we are unable to find. The latter is probably a distinct species. 



In life, the male of N. lutrensis is olivaceous above; edges of scales 

 light clear blue, this color especially distinct in a broad saddle at the 

 nape, which extends downward to the pectoral; this bar of a clear 

 vitriol blue. Behind this and parallel with it is a scarlet area. Oper- 

 cle scarlet. Front of head crimson. Dorsal fin creamy, shaded. with 

 dusky. Other fins light clear blood-red. A slight dusky area at base 

 of caudal. Xo black blotch on chin (in Iowa specimens; this usually 

 present in Texas examples). 



Females are light olive, the fins dull red. Immature examples are 

 variously intermediate. Scales pretty constantly 6-34-3. 



8. Notropis rubrifrons, Cope. 



One male specimen. Silvery ; upper part of head, sides of breast, base 

 of dorsal, pectoral, and caudal, bright light brick red. Anal rays 9. 



