172 BULLETIN FLORIDA STATE MUSEUM Vol. 8

apparently is fairly common in favorable habitats in southern Ar-
kansas, extreme southeastern Oklahoma, and extreme northeastern
Texas, but farther west is known only from the Blue River system of
south-central Oklahoma. To the east it occurs in a number of smaller
tributaries of the Mississippi River in western Mississippi, and re-
cently has been recorded as far north as southwestern Tennessee
(USNM 179780-179781). It probably does not normally occur in any
independent river system east of Mobile Bay, although there are un-
published records (not verified by me) from the Escambia and Choc-
tawhatchee drainages in Alabama. In the Coosa River system isolepis
occurs as far north as Chilton County, Alabama; here its range dove-
tails with that of N. c. chrysocephalus. It is one of the most common
fishes in upland tributaries to the Gulf of Mexico.
 LIFE HISTORY AND ECOLOGY. No studies dealing with the life
history and ecology of N. c. isolepis have been made. The form
probably differs little, if at all, from N. c. chrysocephalus in these
regards.