FISHES OF OKEFINOKEE SWAMP 
363 
the distinguishing characters are based on coloration, a char- 
acter which is admitted to be variable. 
In view of the situation the material from Okefinokee, coming 
as it does from a hitherto unknown station, should prove of in- 
terest. We are unfortunate in that only one specimen of Umbra 
was collected. This was 2 inches long or 1^ inches exclusive 
of the caudal. (Additional specimens were collected in 1921.) 
The jaws are not produced and are nearly equal. The lower one 
is if anything slightly longer than the upper. In these characters 
and in body measurements our specimen agrees most closely with 
the description of U. limi, the Western Mud Minnow, which is 
supposed to range from Quebec to Minnesota and south to Ohio 
river. 
In regard to color, we find it difficult to place our specimen 
in the already established species. The color is, to be sure, olive 
green to brown, the color being deeper at the caudal extremity 
of each scale. The dorsal part of the body is, if anything, 
darker than the ventral but it would be difficult to describe the 
whole body as “dark” or “dull.” If anything it is both. The 
gill covers are lighter in color than any other part of the body 
exposed in a lateral aspect. There is absolutely no indication 
of transverse stripes or vertical bars and it would seem to us that 
such characters are not sufficient to separate a species, particular- 
ly when both characters may appear in a given form. Gill ® fig- 
ures specimens of Umbra in which both streaks and bars are pres- 
ent. He does not himself name the species. There is a precaudal 
black bar with a fainter bar at the base of the fin, such as has been 
ascribed to both species. In our specimen this precaudal bar is very 
distinct, thus making the specimen agree more closely with the des- 
^ cription of U. pygmaea. The lower jaw, on the other hand, agrees 
with that of U. limi. It is very pale beneath and dark but not 
black at the margin. The fins are slightly lighter in color than the 
body. 
To sum up our findings, we would say that our specimen 
resembles U . limi in the body measurements and in the intensity 
of color of the precaudal bar. It has a lower jaw much like that 
of U . pygmaea and the range of U . pygmaea would lead us to ex- 
pect it rather than U. limi in Okefinokee. Our specimen differs 
from the descriptions of both U . limi and U. pygmaea in regard to 
'vae lateral and vertical bars and stripes and inasmuch as Jordan 
and Evermann and Gill ® differ in regard to which species is the 
darker we cannot use this character effectively to any extent. 
