were found in the lower mainstream.

_Ictiobus cyprinella_ (Valenciennes). KU 10; UMMZ 2; DM 1. The
big-mouth buffalo was taken only near the mouth of the river; black
buffalo, _Ictiobus niger_ (Rafinesque) and smallmouth buffalo,
_Ictiobus bubalus_ (Rafinesque), possibly also occur there but were
not taken in our survey.

_Catostomus commersonnii commersonnii_ (Lacepede). KU 4, 8, 14;
UMMZ 1, 5; DM 10, 11, 15, 16, 21, 23, 25, 26, 27, 29, 34, 42. The
white sucker occurs primarily in upstream-habitats in the Wakarusa
Basin.

_Moxostoma aureolum_ (LeSueur). KU 15; DM 1. The northern redhorse
was taken only in downstream portions of the basin. Minckley and
Cross (1960) regard specimens from the Wakarusa River as
intergrades between _M. a. aureolum_ and _M. a. pisolabrum_.

_Cyprinus carpio_ Linnaeus. KU 9, 12, 15; DM 1, 2. The carp, though
most abundant in downstream situations, probably occurs throughout
the drainage and is a potential pest in all impoundments likely to
be constructed in the basin.

_Notemigonus crysoleucas_ (Mitchill). KU 9; DM 9, 27, 33, 41. The
golden shiner was found only in tributaries.

_Semotilus atromaculatus_ (Mitchill). KU 2, 3, 5, 6, 7, 8, 10, 12,
13, 14; UMMZ 4, 5; DM 3, 9, 10, 11, 15, 16, 17, 18, 19, 20, 21, 23,
24, 25, 26, 29, 30, 31, 32, 33. The creek chub was usually abundant
in small upland tributaries.

_Hybopsis biguttata_ (Kirtland). KU 1, 3; UMMZ 4. The hornyhead
chub seemingly was common in early collections but has not been
found since 1924. The fish characteristically inhabits clear
streams having gravel-bottom. Disappearance of the species from the
Wakarusa may have resulted from increased siltation and
intermittency of flow.

_Hybopsis storeriana_ (Kirtland). KU 10; UMMZ 3.

_Hybopsis aestivalis_ (Girard). KU 10; UMMZ 3; DM 1. This species
and the preceding one are common in the Kansas River but do not
ascend far up the Wakarusa. _Hybopsis gelida_ (Girard) and
_Hybopsis gracilis_ (Richardson) occur in the Kansas River and may
be expected in the lowermost portion of the mainstream of the
Wakarusa.

_Notropis percobromus_ (Cope). KU 12; DM 1, 2. The plains shiner
shows little tendency to move far upstream from the Kansas River,
where it is abundant.

_Notropis umbratilis_ (Girard). KU 5, 11, 14; UMMZ 1, 4, 5