![]() Their egg sac serves to protect not only the mature spiders, but also to protect the eggs and immature stages of the yellow sac spider. Females typically mate only once but produce as many as five egg sacs, each of which contains approximately 40 eggs. Male yellow sac spiders will hunt for females and breed with them in the early summer. Yellow sac spiders are found throughout most all of the United States, but are fewer in number within the northern, colder climates. Their preferred habitats around the home are in: In addition to protection, these daytime hiding places also function as molting sites (shedding of their outer "skin" in order to grow larger), mating, egg laying, and hibernating sites. 4 They are usually pale in colour, and have an abdomen that can range from yellow to beige. Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. Outdoors, these spiders normally are found hiding in rolled up leaves or in other debris in small, hidden locations. The eye arrangement of spiders in the genus Cheiracanthium. Yellow sac spiders are usually most active at night, and during the day will retreat to their web masses (sacs) for protection against predators. If food sources are limited, these spiders become cannibalistic and may consume their own eggs. Yellow sac spiders usually feed on other spiders, plus agricultural and garden pest insects and their eggs. ![]() Size: The yellow sac spider is a small spider with a body length of about 1/4 inch for both males and females. This leg coloration gives these spiders the appearance of having dark colored feet. ![]() Its chelicerae (fangs), and the tips of their legs are dark brown. Body: The top part of its abdomen includes a dark, lance-shaped mark that runs down the middle of the abdomen from the point where the thorax and abdomen meet to about the mid-point of the abdomen.Ĭolor: It has a pale beige to yellow color and often has a tinge of green. ![]()
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