Identification of Ahasverus advena (Waltl) (foreign grain beetle) and Ahasverus rectus (LeConte) (Coleoptera: Cucujidae) by micromorphology of adult fragments including genitalia.

Morphological characteristics of dissected fragments from male and female adult beetles of Ahasverus advena (Waltl) and A. rectus (LeConte) are described and illustrated, including original descriptions of the male genitalia of both species. Diagnostic differences are noted among the morphology of the head, antennae, mandibles, labium, tibial leg segments, prothorax, metasternum, and abdominal sternite I, and between the shape and/or setation of the paired lateral lobes, the apical margin of the aedeagus, the internal sac, and the paired 8th and 9th abdominal sternites for the male genitalia.