Black widow spiders can be recognized by which marking?

• A. Red hourglass marking on the dorsal side
• B. White stripes on the legs
• C. Red hourglass marking on the ventral side
• D. Blue dots on the abdomen

Answer: (C)

Black widows are most easily identified by a red hourglass-shaped marking on the underside of the abdomen. The ventral (bottom) location is essential—this distinctive red hourglass on the belly sets them apart from other spiders. A red hourglass on the top side would not be the correct identifying feature for this species, and white stripes on the legs or blue dots on the abdomen aren’t characteristic marks of black widows. Keeping an eye on that ventral red hourglass helps you recognize this dangerous spider quickly and accurately.