Insect Identification
Insect Identification

Long-Legged Sac Spider - (Cheiracanthuim mildei)

Authored By Staff Writer | Last Updated: 1/23/2014

The commonly seen Long-Legged Sac Spider is best admired from a distance. Their bites can be a bit painful.

This pale spider is typically found in homes and offices (on ceilings, in corners, under beds, etc). They build thin silk tent-like shelters in these corners and dark spaces. The Long-Legged Sac Spider is a fast runner because it is an ambush predator. The silk shelters are not for ensnaring prey, but for resting. Its non-lethal venomous bite is painful humans and can be slow to heal.

Its thorax is darker than its abdomen. The abdomen has a center line marking that starts thicker at the 'waist' and tapers off before getting halfway down the abdomen. They are somewhat translucent and can range from a dark yellow to almost pale green or white.

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Category: Spider
Common name: Long-Legged Sac Spider
Scientific Name: Cheiracanthuim mildei

  Kingdom: Animalia
   Phylum: Arthropoda
    Class: Arachnida
     Order: Araneae
      Family: Miturgidae
       Genus: Cheiracanthuim
        Species: mildei

Adult Size (Length): 5mm to 9mm (0.20in to 0.35in)

Identifying Colors: white; cream; tan; yellow

Additional Descriptors: fast, albino, biting, venomous

North American Reach (Though Not Limited To*): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Hawaii; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico

* Keep in mind that insect reach is not governed by lines on a map and therefore may appear in areas/regions/states beyond those listed above.