Appearance
The adult has a flat, brown body 2 to 2.5 cm long, 7 to 10 cm wide, including the legs. The female may be slightly larger than the male, particularly in the abdomen, but the male has longer legs and larger tips on its pedipalps. The clypeus, the area just in front of the eyes, is cream or yellowish, and the carapace behind the eyes has a wide band which is usually tan in the female and cream in the male. The body is not very hairy, but the legs have erectile setae, each of which is marked with a black dot.
Behavior
The female produces an egg sac up to about 2.5 centimeters wide and carries it with its pedipalps under its body. Egg sacs are variable in size, usually containing over 100 eggs, with larger ones holding over 400. The spiderlings undergo their first molt while still in the sac. In one small laboratory sample, the life span of the male averaged 465 days, and that of the female was 580 days.As part of its courtship behavior, the male produces a sound by vibrating its abdomen while keeping its feet firmly planted. This is faintly audible to humans as a "buzz" or "hum".
The spider is not considered dangerous, but it does deliver enough venom to give a painful bite.
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