Atypical pyoderma gangresosum in inflammatory bowel disease. A severe diagnostic challenge.

The rhinoceros beetle Trypoxylus dichotomus (Coleoptera, Scarabaeidae, Dynastinae) feeds on the sap of trees. The main original host of the Japanese subspecies T. d. septentrionalis is the oak tree Quercus acutissima. However, this subspecies is also attracted to the introduced ash tree Fraxinus griffithii that has rapidly become popular as a garden plant in Japan (Hongo 2006). Recently, we noticed many individuals of T. d. septentrionalis feeding on the sap and mating on the introduced ash tree during daytime in Japan.