Penn State Extension

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Joseph Berger,
Common House Spider - Articles Articles

Common House Spider

Steve Jacobs

Parasteatoda tepidariorum is widely distributed throughout the world. It commonly constructs webs in the corners of walls and windows in houses and barns. More
Steatoda grossa female. Photo by Steven Jacobs, Penn State Extension
False Black Widow Spider - Articles Articles

False Black Widow Spider

Steve Jacobs

The false black widow is found in the coastal states of the Atlantic, Gulf, and Pacific regions. It is a common spider in homes and other structures. More
Loxosceles reclusa male. Photo by Richard Vetter
Brown Recluse Spiders - Articles Articles

Brown Recluse Spiders

Steve Jacobs

Eleven species of Loxosceles are indigenous to the continental United States, four of which are known to be harmful to humans. More
Paraphidippus aurantius female
Emerald Jumper - Articles Articles

Emerald Jumper

Steve Jacobs

This colorful spider had not been recorded previously in Pennsylvania. However, it has been identified in Delaware, Maryland, Virginia, and ten other states. More
Eugene E. Nelson,
Bold Jumper Spider - Articles Articles

Bold Jumper Spider

Steve Jacobs

The jumping spiders are small, compact hunting spiders. Phidippus audax is the most common jumping spider seen in and around Pennsylvania homes. More
Joseph Berger,
Longbodied Cellar Spider - Articles Articles

Longbodied Cellar Spider

Steve Jacobs

The longbodied cellar spider has extremely long legs and is found in many types of buildings throughout the year. It is not known to be in any way harmful. More
Joseph Berger,
Agrarian Sac Spider and Longlegged Sac Spider - Articles Articles
Sac spiders are found on foliage; under leaf litter, stones, and boards; on buildings under windowsills and siding; and in wall and ceiling corners in homes. More
Salticus scenicus female
Zebra Jumper - Articles Articles

Zebra Jumper

Steve Jacobs

This spider, originally from Europe and Asia, is found sporadically from Nova Scotia to British Columbia, south to Georgia, and westward to Colorado. More
Eris militaris male
Bronze Jumper - Articles Articles

Bronze Jumper

Steve Jacobs

This spider is found throughout most of the continental United States and Canada. More
Leslie J. Mehrhoff, University of Connecticut,
Marbled Orbweaver Spider - Articles Articles

Marbled Orbweaver Spider

Steve Jacobs

The genus Araneus has about 1,500 species worldwide, making it the largest of all the spider genera. More
Araneus saevus male
Fierce Orbweaver - Articles Articles

Fierce Orbweaver

Steve Jacobs

Araneus saevus is found from Canada into the northern United States. It can be seen in forested areas and suburbia with mature landscape plantings. More
Joseph Berger,
Woodlouse Hunter Spider - Articles Articles

Woodlouse Hunter Spider

Steve Jacobs

The woodlouse hunter spider preys on pill bugs or sow bugs (order Isopoda) and derives its common name from the British common name for these crustaceans. More
Herpyllus ecclesiasticus female
Parson Spider - Articles Articles

Parson Spider

Steve Jacobs

Stealthy ground spiders hunt at night and hide under leaves, boards, and stones during the day. The most commonly encountered of these is the parson spider. More
Edward L. Manigault, Clemson University Donated Collection,
Wolf Spiders - Articles Articles

Wolf Spiders

Steve Jacobs

Wolf spiders are large hunting spiders. Two notable species, Hogna carolinensis and H. aspersa, are occasionally encountered in Pennsylvania homes. More
Joseph Berger,
Hacklemesh Weaver Spiders - Articles Articles
Amaurobius and Callobius species of spiders are found in damp locations under bark, leaf litter, and stones, as well as in woodpiles and other protected areas. More
Whitney Cranshaw, Colorado State University,
Grass Spiders - Articles Articles

Grass Spiders

Steve Jacobs

Grass spiders are common in Pennsylvania and can be recognized by their large, sheet-like webs with a funnel or tunnel located off to one side. More
Dani Barchana,
Banded Garden Spider - Articles Articles

Banded Garden Spider

Steve Jacobs

Banded garden spiders inhabit similar locations as yellow garden spiders, but are not as common in Pennsylvania. More
Tegenaria domestica male. Photo by Steven Jacobs, Penn State Extension
Barn Funnel Weaver Spider - Articles Articles
This funnel weaver is found throughout most of the United States, most notably in sheds and barns, in the crevices of doors, and under rocks and boards. More
Mohammed El Damir,
Cross Orbweaver Spider - Articles Articles

Cross Orbweaver Spider

Steve Jacobs

The cross orbweaver was probably introduced from Europe. This showy orbweaver is commonly encountered next to buildings with exterior lighting. More
Micrathena gracilis female
Spined Micrathena - Articles Articles

Spined Micrathena

Steve Jacobs

This small spider is commonly encountered in wooded locations, including landscaped residential and suburban locales. More
Herbert A. 'Joe' Pase III, Texas A&M Forest Service,
Yellow Garden Spider - Articles Articles

Yellow Garden Spider

Steve Jacobs

Yellow garden spiders are seen in gardens, tall weeds, and sunny areas with bushes and other supporting structures on which they build their large orb webs. More
Trachelas tranquillus female. Photo by Steven Jacobs, Penn State Extension
Broad-Faced Sac Spider - Articles Articles

Broad-Faced Sac Spider

Steve Jacobs

Trachelas tranquillus can be found on foliage; under leaf litter, stones, and boards; and on buildings under the windowsills and siding. More
Commonly Encountered Pennsylvania Spiders
Commonly Encountered Pennsylvania Spiders - Articles Articles
This publication discusses the more common and important spider species in Pennsylvania, including two rarely encountered but medically important species. More
Lyme Disease
Lyme Disease - Articles Articles

Lyme Disease

Erika Machtinger, Steve Jacobs

Lyme disease is an infection caused by the Borrelia burgdorferi bacteria and is transmitted by ticks. More
Source: Scott Bauer, USDA Agricultural Research Service,
Tree Fruit Insect Pests - Plant Bugs and Stink Bugs - Articles Articles
Tarnished plant bugs, Lygus lineolaris, other plant bugs, and various species of stink bugs feed on various tree fruits and on many wild and cultivated plants and make up a unique pest complex. More
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