TABLE OF CONTENTS. xi 



PAGE 



Genus 8. Rhamdia Bleeker 20 



1 6. oaxacae Meek , 20 



17. laticauda (Heckel) 21 



18. brachyptera (Cope) 21 



[wagneri (Gunther)] 22 



19. hypselura (Gunther) 22 



ORDER IV. PLECTOSPONDYLI 24 



Family IV. Catostomidas 24 



Subfamily Ichthyobinae 25 



Genus 9. Carpiodes Rafinesque . 25 



20. meridionalis (Gunther) 26 



21. tumidus Baird & Girard 26 



2 2 . microstomus Meek 27 



23. elongatus Meek 28 



24. labiosus Meek 29 



Subfamily Catostominas 30 



Genus 10. Pantosteus Cope 30 



25. plebeius (Baird & Girard) 30 



Genus 1 1 . Catostomus Le Sueur 31 



26. sonorensis Meek 32 



27. bernardini Girard 32 



28. conchos Meek 33 



Genus 12. Xyrauchen Eigenmann & Kirsch 33 



29. cypho (Lockington) 33 



Genus 13. Myzostoma Rafinesque 34 



30. congestum (Baird & Girard) 34 



3 1 . austrinum Bean 35 



Family V. Cyprinidae 36 



Subfamily Campostomatinae 40 



Genus 14. Campostoma Agassiz 40 



32. ornatum Girard . 41 



33. anomalum (Rafinesque) : 42 



34. formosulum Girard 42 



Subfamily Chondrostomatinas 43 



Genus 15. Xystrosus Jordan & Snyder 43 



35. popoche Jordan & Snyder 43 



Genus 16. Algansea Girard 44 



36. tincella (Cuvier & Valenciennes) 44 



37. dugesi Bean 45 



38. rubescens Meek .' 46 



39. lacustris Steindachner 47 



Genus 17. Hybognathus Agassiz 48 



40. episcopus (Girard) 48 



41 . rasconis (Jordan & Snyder) 50 



Genus 18. Pimelocephales Rafinesque 50 



42. confertus (Girard) 51 



Subfamily Mylopharodontinag 51 



Genus 19. Stypodon Garman 51 



43 . signifer Garman . . 5 * 



Subfamily Leuciscinas 52 



Genus 20. Ptychocheilus Agassiz 52 



