90 
Noel M. Burkhead, et al. 
(appearing bicolored); premaxillary tooth patch of 
large juveniles and adults as in Figure 3C; gill rakers 
usually 10-14 (10-17); anal rays usually 22-24 (21-26) I. platycephalus. 
Mental barbels usually profusely pigmented (occasionally 
pigment only developed basally in small specimens); 
maxillary barbels uniformly dark; premaxillary tooth 
patch in large juveniles and adults as in Figure 3B; gill 
rakers usually 12-16 (11-18); anal rays usually 
18-20 (18-22) I. brunneus. 
7. Mental barbels usually pale; anal rays usually 24-27 
(24-28); gill rakers usually 12-15 (12-18) I. natalis 
Mental barbels usually profusely pigmented 8. 
8. Gill rakers usually 17-20 (15-24); a rectangular 
depigmented area often present at base of caudal 
fin in adults I. melas. 
Gill rakers usually 13-15 (13-16); caudel base with 
uniform pigmentation I. nebulosus. 
ACKNOWLEDGMENTS. — The following people kindly provided 
specimens for this study; Edward B. Brothers, Cornell University; 
Donald G. Cloutman, formerly Duke Power Company; David A. Etnier, 
University of Tennessee, Knoxville; E. David Frankensteen, U. S. Army 
Corps of Engineers; John Gourley, Virginia Institute of Marine Science; 
Larry Hart, Virginia Commission of Game and Inland Fisheries; Elbe 
Koons, University of Michigan Museum of Zoology; William J. 
Matthews, formerly Roanoke College; O. Eugene Maughan and Morris 
Mauney, formerly Virginia Cooperative Fisheries Unit; Edward F. 
Menhinick, University of North Carolina at Charlotte; James P. Oland, 
U. S. Fish and Wildlife Service; W. Ralph Taylor and George Van Dyke, 
U. S, National Museum of Natural History; Bruce Turner, Virginia 
Polytechnic Institute and State University; and Shirley K. Whitt, 
Lynchburg College, 
Locality data, comments on critical records, or stocking information 
were provided by the following: Michael Corcoran, Duke University; 
Donald G. Cloutman, DPC; Edward C. Enamait, Maryland Fish Ad- 
ministration; John Gourley, VIMS; Larry Hart, VCGIF; Frank J. 
Schwartz, University of North Carolina Institute of Marine Sciences; 
William B. Smith, North Carolina Wildlife Resources Commission; Jay 
R. Stauffer, University of Maryland; W. Ralph Taylor, USNM; David 
K. Whitehurst, VCGIF; and Ralph W. Yerger, Florida State University. 
W. Ralph Taylor also made us aware of the gill raker difference between 
I. melas and /. nebulosus. We are grateful to Michael Corcoran, Duke 
University, for a review of a draft of this paper, Susan Karnella (USNM) 
provided us with the catalog number of an Ictalurus punctatus. 
LITERATURE CITED 
Abbott, Tom M., K. L. Dickson and W. A. Potter. 1977. Notropis cerasinus 
