yeighed 2.22 grams, and was in its second year of 
fe. It looked superficially like P. maculata except for 
aving 12 dorsal spines and 12 lateral blotches similar 
9 those of P. phoxocephala. The second individual 
ras 7) mm, weighed 4.25 grams, and was in its third 
ear of life. It looked superficially like P. phoxocephala 
ith an orange band on the spiny dorsal. However, 
_had 14 dorsal spines, 9 lateral blotches, and a large 
2ardrop similar to P. maculata. 
17 
Most hybrid Percina that have been reported in the 
literature have P. caprodes as one parent. ‘Trautman 
(1948) found that in low-gradient streams entering 
Lake Erie, ecological barriers which separated spawning 
P. caprodes and P. maculata in moderate-gradient 
streams were broken down, leading to hybridization. In 
the Kaskaskia at Sullivan, high and turbid waters 
during the breeding season may have been the main 
factor leading to hybridization. 
Station 3 
LITERATURE CITED 
UR, ALBERT P. 1959. Distribution of the darters (Percidae, 
theostomatinae) of northeastern Oklahoma. Southwestern 
Naturalist 4(1):1-13. 
SS, FRANK B. 1954. Fishes of Cedar Creek and the South 
Fork of the Cottonwood River, Chase County, Kansas. Kan- 
sas Academy of Science Transactions 57:303-314. 
E4967. Handbook of fishes of Kansas. University of 
ansas Museum of Natural History Miscellaneous Publica- 
tion 45. 357 p. 
CON, JAMEs Everett. 1961. Fish populations, following a 
4rought, in the Neosho and Marais des Cygnes Rivers of 
Kansas. University of Kansas Publications, Museum of Nat- 
aral History 13(9) :359-427. 
ForBEs, STEPHEN ALFRED, and Rospert EARL RICHARDSON. 
1920. The fishes of Illinois. 2nd ed. Illinois Natural History 
Survey. cxxxvi + 357 p. 
GREELEY, J. R. 1927. Fishes of the Genesee region with an- 
notated list, p. 47-66. In A biological survey of the Gene- 
see River system. New York Conservation Department, 
Supplemental to Sixteenth Annual Report, 1926. 
. 1928. Fishes of the Oswego watershed, p. 84-107. In 
A biological survey of the Oswego River system. New York 
Conservation Department, Supplemental to Seventeenth An- 
nual Report, 1927. 
1929. Fishes of the Erie-Niagara watershed, p. 150- 
179. In A biological survey of the Erie-Niagara system. New 
