Contents 



Page 



Introduction 1 



Acknowledgments 2 



Source of material 4 



Methods 5 



Counts 5 



Measurements 8 



The Family Ictaluridae 9 



The sensory canal system 11 



Relationships of the genera of the Ictaluridae 14 



Genus Noturus Rafinesque 20 



Key to the subgenera of Noturus 23 



History 23 



Zoogeography 24 



Sexual dimorphism 26 



Reproduction 27 



Early development 30 



Subgenus Schilbeodes Bleeker 32 



Key to the species of the subgenus Schilbeodes 34 



Noturus gyrinus (Mitchill) 35 



Noturus lachneri, new species 54 



Noturus exilis Nelson ,. 57 



Noturus leptacanthus Jordan 68 



Noturus nocturnus Jordan and Gilbert 74 



Noturus insignis (Richardson) 83 



Thefunehris group 95 



Noturus funebris Gilbert and Swain 96 



Noturus -phaeus, new species 100 



Noturus gilberti Jordan and Evermann 105 



Subgenus Noturus Rafinesque 108 



Noturus flavus Rafinesque HI 



Subgenus Rabida Jordan and Evermann 128 



Key to the species of the subgenus Rabida 130 



The hildebrandi group 131 



Noturus hildebrandi (Bailey and Taylor) 131 



Noturus hildebrandi hildebrandi (Bailey and Taylor) 136 



Noturus hildebrandi lautus, new subspecies 138 



Noturus baileyi, new species 141 



Noturus albater, new species 144 



The elegans group 1^0 



Noturus elegans, new species 150 



Noturus trautmani, new species 156 



Noturus eleutherus Jordan 1^0 



The furiosus group 1^^ 



. Noturus placidus, new species 168 



Noturus stigmosus, new species 173 



Noturus munitus Suttkus and Taylor 180 



V 



