Spiders, daddylonglegs, ticks, mites, and scorpions, belong to the class Arachnida.
Spiders - PSU Entomology.
Commonly Encountered Pennsylvania Spiders and two rarely encountered but medically important species. Detailed colorful PDF booklet.
General Information about Spiders PSU Entomology.pdf
Spider Management — PSU Entomology.pdf
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