1897.] Flora and Fauna of Mammoth Cave, Ky. 379 
and that isthe small white leech. An undetermined nematode 
worm, two specimens in all, has been found by the writer in a 
small rill which furnishes the water to Richardson’s Spring, in 
the Labyrinth. On the walls about such places the “ cave 
crickets ” abound, and under the flat stones along the way may 
be found the very small and white spiders, associated with the 
small white and delicate Campodea cookei. Occasionally a 
brownish beetle, Anophthalmus, scurries across the over-turned 
stone, or may be seen running rapidly over the moist sands. 
In a few localities, where decaying toadstools are found, or 
where decaying vegetation of other sorts occurs, small flies 
occasionally appear fluttering in uncertain way about the lamps 
or run rapidly over the wet sand. In a single locality appears 
the minute mollusk, which we herein describe, the only known 
form which is a true cave mollusk in this cavern. 
To the list of cave animals which appears in Packard’s mono- 
graph must now be added seven forms, which are new to science, 
and several forms which, while known, have not before been 
definitely reported from Mammoth Cave. Without exception 
the new forms are very minute, and this fact is in itself suffi- 
cient to explain their late appearance in lists of the cave fauna. 
Without attempt to arrange them into strict systematic groups 
it will be enough to say that there is one new mollusk, one new 
dipterous insect, two new thysanurids, one new psocid, one new 
pseudoscorpionid, two new acarinids, among the animals; while 
several others have been collected in sufficiently great num- 
bers to settle doubts connected with their affinities, or to make 
absolutely certain previous doubtful records or their occur- 
rence. This is true of the two dipterous forms hitherto listed 
as Sciara and Phora, without specific names. 
The descriptions which follow are prepared from the mate- 
rial collected by me by the gentlemen whose names are ap- 
pended to the several forms, and the species are to be quoted 
with their names in authorship. This paper for the first time 
presents these new forms to science; their authors should have 
the fullest credit in citations. These new forms may be de- 
scribed as follows: 
