THE AMERICAN CYPRINID FISHES OF THE SUBGENUS
 LUXILUS (GENUS NOTROPIS)


 CARTER R. GILBERT 1


SYNOPSIS: The cyprinid fishes of the subgenus Luxilus (genus Notropis) comprise
three well-defined species groups of eight species and one subspecies. They
occupy clear, small to medium-sized streams over most of temperate North Amer-
ica east of the Rockies, being absent only from areas southwest of the Red River
drainage in Texas, the upper Missouri basin, the southern Piedmont plain, and
peninsular Florida. The present study defines the subgenus, reviews its nomen-
clatural history, explains its patterns of variation, describes the various forms and
their distributions, and discusses their probable zoogeographic and phylogenetic
histories.


 TABLE OF CONTENTS


Introduction ----
Acknowledgements ---
Materials --
Methods of Counting and
 Measuring
Hybridization --- ----
Zoogeography and Phylogeny -
Generic and Subgeneric
 Nomenclatural History ..
Subgeneric Diagnosis and
 Specific Relationships ----_--
Key to Species and Subspecies
 of the Subgenus Luxilus -...
Species and Subspecies Accounts
 Notropis coccogenis ..--...


 Notropis zonistius -- 126
 Notropis zonatus --- 129
 Notropis pilsbryi ----- 133
 Notropis cerasinus --- 136
 Notropis cornutus --- 140
 Notropis albeolus ____--151
 Notropis chrysocephalus ------ 157
 Notropis chrysocephalus
 chrysocephalus -- 158
 Notropis chrysocephalus:
 chrysocephalus X isolepis 166
 Notropis chrysocephalus
 isolepis ...- 167
Tables 173
References Cited ...----------..- 185


1 This paper is a revision of a dissertation submitted to the University of Michi-
gan in 1960 in partial fulfillment of the Ph.D. degree. The work was carried
out while the author served as a teaching fellow in the Department of Zoology
and as a research assistant in the Division of Fishes of the Museum of Zoology.
Now at the University of Florida, he is Assistant Professor of Biological Sciences
and Assistant Curator of Natural Sciences in the Florida State Museum. Manu-
script received 5 July 1963.-ED.


Gilbert, Carter R. 1964. The American cyprinid fishes of the subgenus Luxilus
(Genus Notropis). Bull. Florida State Mus., vol. 8, no. 2, pp. 95-194.