Hobo spider. Property of: Tobias Mercer

Life of the Hobo

It is not known for sure what the exact life cycle of Tegenaria agrestis is.  Many arachnologists think that the hobo spiders that are found on the west coast complete their life cycle in only one year.  Unlike the west coast spiders, the inland hobo spiders appear to go through a two or three year life cycle.  There have been spiders found in three distinct stages, and this would lead people to believe that the inland spiders go through three year life cycles and not two.  These stages are small juveniles, medium sized immatures, and adults.

Hobo spider. Property of: JudgekingHobo spoider. Property of: K. S. Matz

During the months of September and October the female, adult hobo spider will lay eggs that are placed into one to four egg cases.  A single egg case can hold 100 or more eggs.  The egg cases that house the eggFunnel web. Property of: Pollinators are made up of a combination of layers of silk with debris and soil.  The cases can be found in a variety of locations outside, including piles of rocks and wood.  The juvenile spiders hatch in June and remain beneath the surface where they feed and grow.  Hobo spiders grow via molting.  If it is the two year scenario, the spiders will grow into adults in either July or August.  Once adults, the spiders do different things depending on the sex.  The males start seaCommon funnel web spider. Property of: J.M.Gargrching around for mates in the night time, and the females construct webs and don’t move from them.  During this time is when the majority of hobo spider bites on humans occur, because the males sometimes wander into houses looking for females.  The most popular time for mating and hobo spider activity is within the first couple of weeks of September.  When the males are done mating they die shortly afterwards, and almost all of the males are gone by October.  The females construct the egg cases and then usually die in the web by the middle of November.  Occasionally some of the females will enter a house after mating, but it is rare.
Spider egg. Property of: James K. Lindsey
The hobo spider needs another mate in order to reproduce.  Like humans, Tegenaria agrestis partakes in gametic meiosis.  This is when the organism goes through meiosis to produce haploid gametes.  These gametes, which are sperm and egg, then fuse with other gametes under fertilization.  This produces a diploid zygote.  The diploid zygote then grows via mitosis, and then eventually does meiosis to start the whole cycle over again.

Competitors and Predators