328 
first appeared during my last week at the laboratory, so that my obserya- 
tions did not extend over a period long enough to determine if they were 
permanent inhabitants of the area, or whether they had just migrated 
there as several species of Tetragnatha had. This last supposition I con- 
sider very improbable, as I found no Clubonias in any other part of the 
marsh. 
Their reactions to the tides were such as would prevent them from 
drowning or being washed away, but they afforded little protection from 
their aquatic enemies save that secured from their inconspicuousness. 
When the tide came in, they crawled to the under side of the Spartina 
blades. When resting in this position with their long legs stretched out 
along the edges of the blade, they are difficult to see. That they are not 
destroyed by the tide was shown by the fact that on August 5, after the 
Spartina area had been submerged by the tides of three successive days, 
I still found them in abundance. I placed several of them, in the position 
I found them on the grass when covered by the tide, in a jar of sea water 
and kept them submerged for thirty hours. They were apparently un- 
affected, showing that this spider, as well as the Grammonata trivittata, 
must have some unique modification to prevent drowning. ‘This spider, 
however, entangled more air bubbles in its longer, flimsier hair. Its feet 
are provided with toothed claws, perhaps developed to secure a firm hold 
on the grass blade. 
I am anxious to secure more data concerning this spider. Is it a per- 
manent resident of the Spartina area? What accounts for its sudden ap- 
pearance? Where were the adults, or when’? Its resistance to drowning 
is great enough to allow it to be a permanent inhabitant, but I doubt if 
it is sufficiently well protected from the inhabitants of the sea. However, 
the pads on its feet, which resemble those of a water strider and the 
one large toothed claw as well as several smaller ones on each foot may be 
structures of particular value to a resident of a between tides zone. 
The pads would enable it to move on the surface of the water, while the 
claws would enable it to secure such a firm hold on the grass blade that 
it could not be washed away. 
INSECTS OF THE OUTER JUNCUS AREA. 
BEMBIDIUM CONSTRUCTUM. 
Of all the insects whose habits I observed, this brownish-black, 5 mm. 
long, beetle had the widest range. It was the only one to live in both 
