5 CONCLUSION
We investigated, by means SEM, the external morphology and distribution of the oral appendages of G. cantor . We find that the gross morphology and ultrastructural morphology of mandible, labial and mandibular palpus are significantly different between sexes of G. cantor using scanning electron microscopy. Observation of the gross morphology of the mandible, labial palpus and mandibular palpus revealed that their lengths were significantly greater in females. In terms of the ultrastructural morphology of the mandibles, females have significantly more ST I and SCh III on their mandibles than males. The mechanical sensors SCh and Bb, olfactory sensor ST II, taste sensor STB IV, and carbon dioxide sensor and temperature and humidity sensors SC, SP and SCa were significantly more developed on female than male labial and maxillary palps. These play an important role in reproductive behavior to provide new insights for the pest control and forest protection.