Fig. 10. Males possess a in Characterization of stridulatory structures and sounds of the larger Mexican pine beetle, Dendroctonus approximatus (Coleoptera: Curculionidae: Scolytinae)

Fig. 10. Males possess a well-developed file on the lef elytron a), with a relatively underdeveloped file on the right elytron b). The development of a file in female D. approximatus was highly variable and ofen almost non-existent. Lef elytron of female with a well-developed file, relative to most other observed female files c), and of female with poorly-developed file d).