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Long-legged Sac Spider (Cheiracanthuim mildei)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Long-legged Sac Spider



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Image Credit: Barry G. from Chicago, IL
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Image Credit: Barry G. from Chicago, IL
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Image Credit: Tanya G. from NJ
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Despite its propensity to come inside and make itself at home, the Long-legged Sac Spider is best admired from a distance.



Updated: 08/23/2019; Authored By Staff Writer; Content ©www.InsectIdentification.org
This pale spider is typically found in homes and offices on ceilings, in corners, and under beds. It builds a thin silk tent-like shelter in these corners and dark spaces. The silk shelters are not for ensnaring prey, but for resting. The Long-legged Sac Spider is a fast runner because it is an ambush predator, and it is most active at night, under cover of dark. It is not picky; any type of insect it comes across is fair game. It may seek a hidden shelter in a pile of clothes on the floor. Out of surprise, or if getting crushed, the spider will bite. Its non-lethal venomous bite is painful humans and can be slow to heal, giving parents everywhere a good reason to encourage kids to put their clothes away. If startled, they may base jump off of tables and ceilings.

Long-legged Sac Spiders have a darker thorax than abdomen. The pale abdomen has a center marking that is thicker at the 'waist' and tapers off before getting halfway down the abdomen. Though most individuals are brown and ivory, some have abdomens that are a dark yellow, pale green, or even white. Pale legs end with feet that are typically black, or very dark. Females can lay over 30 eggs in one brood. It is possible that if one Long-legged Sac Spider is found inside, others may pop up throughout the week.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Insect biting icon
Fast insect icon
Harmful insect icon
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Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Miturgidae
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          Genus: Cheiracanthuim
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            Species: mildei
Identifying Information
Size, Colors, Features
Scientific Name: Cheiracanthuim mildei
Other Name(s): Yellow Sac Spider, Black-footed Spider
Category: Spider
Size (Adult; Length): 5mm to 9mm (0.19" to 0.35")
Colorwheel Graphic Colors: white; cream; tan; yellow; black
Descriptors: fast, albino, biting, venomous, harmful, black foot
Relative Size Comparison
Typical Range Between 5mm and 9mm
Lo: 5mm
Md: 7mm
Hi: 9mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
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Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Long-legged Sac Spider may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Long-legged Sac Spider. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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