188(5.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 11 



5. Catostomus nigricans Lc Sncnr. 



6. Moxostoma niacrolepidotum Lo Sueur. 



7. Placopharynx carinatus Cope. 

 Abundant. 



A large, coarse Sucker, externally identical with the species of 7lfo.ro.?- 

 fowm, from which genus it diiiV^rs only in the remarkable development 

 of the lower pharyngeals and their teeth. The coloration is much deeper 

 than in most species of Moxostoma, the back dark olive-green, the sides 

 brassy, without silvery luster ; the caudal fin deep red. The dusky col- 

 oration persists even in alcohol. 



Head about 4 in length; depth, 3|^. D. 12 ; A. 7. Scales, G-45-5. 

 Longest rays of dorsal longer than base of fin, 1^ in head. Ilead rather 

 broad and flattish above, its upper surface somewhat uneven. Upper 

 lobe of caudal narrower than lower, and more or less longer. 



8. Campostoma anomalum Rafiuesque. 



9. Hybognatlius nuchalis Agassiz. 



Very abundant in the Saline, where it is the commonest of all the 

 Minnows. 



10. Pimephales notatus Eafinesque. 



Common. Numerous young specimens from the Saline are very 

 slender, but seem to show no tangible points of distinction. 



11. Notropis ■Whipple! Girard, 



Very abundant. These specimens are all rather more slender than 

 the Eastern analostamis of the same size, but we find no other difler- 

 ences. 



12. Notropis umbratilis Girard. 



13. Notropis scabriceps Cope. 



Abundant in the swift current, especially in the colder waters of the 

 Caddo River. 



14. Notropis dilectns Girard. 

 . Very abundant. 



A little fish very abundant in the Saline Eiver; was at first taken by 

 us for a distinct species, and referred to under the manuscript name of 

 Kotropis ionthas. 



Renewed comparison leaves little doubt that this is the young of 

 Notropis dilectus. The body in these young fishes is profusely sprinkled 

 with black dots, as in Hyhopsis cestivalis. 



15. Hybopsis dissimilis Kirtland. 

 Common. 



16. Clupea chrysochloris Eafinesque. 



17. Dorosoma cepedianum Le Sueur. 



18. Hyodon tergisus Le Snenr. 



19. Gambusia patruelis Baird &, Girard. 



Abundant in the springs tributary to Caddo River. 



