eS Se eel eee = _ 
NESTING HABITS AND PROTECTIVE ARCHITECTURE. 299 
The nesting habits of all the Angulata group of Epeira known to me 
are like those of the Insular and Shamrock spiders. I have always found 
Epeira bicentennaria and E. sylvatica within rolled leaf nests 
The ee precisely resembling those heretofore described and figured. This 
Aree group is distributed over the entire continent, and may be dis- 
tinguished by two conical processes, more or less prominent, one 
on each side of the anterior part of the abdomen. The Diadem spider, 
the well known Epeira diademata of Europe, heads the group, and may 
have been an importation in the vast trains of human emigrants who 
haye sought our shores. The far western Epeira gemma, and Epeira 
cinerea well scattered over the Northeast, belong to the same group. All 
haye probably the same nesting habits, and are closely related structurally. 
The brief descriptions of the nests of Epeira diademata, quadrata, 
apoclisa, and other European and exotic species made by Blackwall, 
Menge, and Walckenaer, for example, permit us to assert their 
identity in nesting habit with American species. It will proba- 
bly be found that this characteristic is cosmopolitan, and that 
all nest making species of Orbweavers throughout the world have sub- 
stantially the same architectural methods within affiliated groups, and 
that their tents, dens, domiciles, or nests closely resemble each other, the 
variations depending largely upon the nesting site and the material avail- 
able for manipulation and underspinning. 
IV. 
It is difficult to observe all the steps in the construction of a leaf 
nest, inasmuch as the process is not continuous from beginning to com- 
pletion, but is gradual and accumulative. There is certainly a 
How difference in this respect; some species, like Insularis, having a 
Nests are : ane ; 
Built. stronger disposition to provide a well protected nest from the 
outstart of any settlement in a new site. But many spiders con- 
tent themselves with a comparatively rude shelter at first, and, as occasion 
or disposition may prompt, proceed to add to their domicile. 
At one time the leaf or leaves will be drawn closer together; at an- 
other, the roof will be overspun with fresh silk; again, the supporting 
lines will be strengthened, and the silken approaches extended, 
ee or the outlying warp receive additional woof, so closing up the 
ocess nee : 
Gradual. Walls of the tent. Thus the nest is likely to be perfect in pro- 
portion to the time that the occupant has been upon the prem- 
ises. In the intervals of trapping, eating, and snare spinning, the aranead 
architect occupies herself in adding to her house and perfecting its ap- 
pointments. 
Nevertheless, one may have opportunities for seeing the spider’s archi- 
tectural methods, and by piecing together various observations can know 
the entire process. I have been favored with several views of the various 
Unity of 
Habit. 
