Which of the following accurately describes an adult cigarette beetle?

The description of an adult cigarette beetle as oval, about 1/8" long, and reddish-brown is accurate. Adult cigarette beetles typically exhibit a characteristic oval shape and possess a reddish-brown coloration that helps in their identification. Their small size, averaging around 1/8" in length, makes them less noticeable in the environment, which is often a challenge during pest inspections. Recognizing these features is crucial for effective pest management, especially in settings where they may infest stored products like tobacco and other dried goods.

The other options present different physical characteristics that do not align with the cigarette beetle's description, failing to capture its unique features and coloration essential for identification.