33 
covered glass cylinder and placed it where it would be covered by the 
tide. As the tide filled the jar they made no effort to change their posi- 
tions. Those on the grass blades remained in the same position, as did 
also those on the ground. The Bdellidze were still alive in the cylinder 
after it had been submerged by two tides; i. e., two periods of submergence 
of five hours each, one period of terrestrial conditions of four hours. 
Lycosa CoMMUNIS. 
Although the inner limit of the tidal drift, with its myriads of flies 
should furnish abundant food for spiders, this is the only species prevalent 
in the drift covered areas. This is a greyish spider from 4 mm. to 5 mm. 
in length. They venture out beyond the high tide limit, but will always 
retreat before the incoming tide. Their long, strong legs, which enable 
them to run rapidly, make them especially adapted to a region where 
safety lies in retreat. I often found them running inward on the Juncus 
when the grourd was already covered by the tide. On several I found 
them isolated on the blades of Spartina grass. When this position was 
no longer conducive to dryness, they would run rapidly inward over the 
surface of the water. This is the only insect without wings, frequenting 
the between tides zone, which retreats before the tide. The Lycosie. are not 
only the most rapid runners among the spiders, but can also withstand 
several hours more submergelce than the other spiders of the salt marsh, 
Grammonata and Clubonia, of course, excepted. 
Mary winged insects, beetles, flies, etc., are found on the Spartina 
during the low tide; but, although I made no especial study of them, they 
seem to be only temporary residents. They are never abundant, or even 
present, immediately upon the retreat of the tide. I never found any sub- 
merged on the grass when covered by the tide. They are ali good fliers 
and most undoubtedly retreat before the tide. 
On the morning of August 5, when we had the first high tide which 
covered the outer Spartina area entirely for several weeks, I noticed many 
Tetragnatha spiders retreating up the Spartina blades because of the rising 
tide. As the water chased them to the tip of the blade they spun out a long 
thread which the north wind carried to the higher areas. They ran inward 
on the thread. When they accidentally became wetted by the water they 
became helpless. Should the wind have come from the south, they would 
have been destroyed. No Tetragnatha were found in areas that had once 
