4. _Minytrema melanops._ One specimen taken at station G-10 near the
mouth of Crab Creek constitutes the present westernmost record. A
specimen has been taken by Cross (C-24-51) in the headwaters of the
Walnut River.
5. _Notropis boops._ The westernmost record is station G-5 on Grouse
Creek. This fish has been reported slightly west of this in Oklahoma on
Big Beaver Creek in Kay County (number 4776, Oklahoma A & M College
Museum of Zoology).
6. _Notropis volucellus._ Two specimens were taken at station G-8 on
Silver Creek.
7. _Percina copelandi._ The westernmost record is from station G-1, two
miles above the mouth of Grouse Creek.
The easternmost occurrences of four species are in the area studied.
These species are _Hybopsis aestivalis tetranemus_ (Station A-2),
_Notropis blennius_ (Station A-1), _Notropis girardi_ (Station A-2),
and _Fundulus kansae_ (Station A-2 and Walnut River). These fish are
associated with the Arkansas River proper and its sandy western
tributaries. In Oklahoma, these fish are found in the Arkansas River
as it proceeds eastward and in the downstream portions of some of its
tributaries. These fish show little tendency to ascend the streams of
the Flint Hills.