Rice weevils are identified by which distinguishing feature?

Rice weevils are identified by four reddish spots on their elytra, which are the hardened forewings that cover the wings in beetles. This distinctive feature helps in accurately identifying rice weevils among other similar-looking pests. The reddish spots are not only a key characteristic of adult rice weevils but also serve as a visual cue for pest control professionals when diagnosing infestations.

While rice weevils do have a relatively small body size, this characteristic is not unique to them and can apply to other weevil species. Their black coloring is similarly common to various beetles, and while they have long antennae, this trait is shared with many other insects. Thus, the presence of four reddish spots on the elytra is the most definitive and distinguishing feature for identifying rice weevils.