Cheiracanthium inclusum and C. mildei can be difficult to tell apart, though appartently C. mildei tends to occur more often indoors than C. inclusum. These nocturnal hunters do not make webs, but rest in silken cocoons. Both species are widespread across the United States and southern Canada; C. inclusum is native while C. mildei was introduced from Europe. Females are 4.9 to 9.7 mm and males are 4.0 to 7.7 mm. Cheiracanthium species have two tarsal claws on each foot.

Cheiracanthium species - longlegged sac spiders

Cheiracanthiidae contains two genera (Cheiracanthium and Strotarchus) that were previously classified in Miturgidae, then Eutichuridae, now Cheiracanthiidae.