What key difference in abdominal marking separates *Cheiracanthium mildei* from *Cheiracanthium inclusum*?

*C. mildei* tends to have a more pronounced pale brown or grayish stripe running down the middle of its abdomen.

Accurate identification often requires distinguishing the Yellow Sac Spider from close relatives, particularly *Cheiracanthium mildei*, frequently referred to as the Long-legged Yellow Sac Spider. While both species share a general pale yellow coloration, a reliable differentiator lies on the dorsal surface of the abdomen. *C. inclusum* is typically characterized by an unmarked abdomen, perhaps with only very faint dusky lines. In contrast, *C. mildei* specimens commonly display a more defined feature: a pale brown or grayish stripe that runs visibly down the center of the abdomen. Additionally, *C. mildei* is sometimes described as having a slightly more elongated or delicate body structure compared to *C. inclusum*.