* Marked with varying shades of brown, with a white cross pattern on
the abdomen. The white
marks are the result of guanine crystals excreted by the spider as
* Length: 1-1 3/4".
* Habitat: Gardens, near buildings and houses. Female builds orb webs
* Range: Throughout the United States.
* Behavior: Feeds on flies and other insects. Female sometimes eats male
during or after copulation.
* Spider webs are truly miracles of engineering, as well as beautifully
designed artworks. Areneus diademata and other orb-building spiders
begin their webs with a central hub (See diagram at right, from The
Biology of Spiders, by Rainer F. Foelix, Harvard University Press,
1982). The hub is surrounded by a 'free zone', in which the spider
can move around unhampered by intricate spiralling threads. From the
hub come 25 to 30 dry radial threads, which connect to strong frame
threads around the outer perimeter of the web. Spiralling threads go
from outside of the free zone to the edge of the web, and sticky threads,
running from the outside to the free zone, are spun last and coated
with sticky droplets. The spider waits in the center of the web until
a careless insect becomes caught in the sticky threads, and then she
runs to wrap it up and paralyze it, storing it for future use.
* "The evolution of spider silk has been an event comparable
in importance to the evolution of flight in insects, or warmbloodedness
in the vertebrates."
-M.R. Gray, spider researcher, 1978.
* Spider silk is stronger than steel, incredibly light, and
almost impossible to dissolve. No wonder scientists see it as
the fiber of the future! It has been spun into fabric, and advances
have been made in production of synthetic spider silk, for use
in medical sutures and in gunsights of high-powered rifles.