Grant's Rhinocerous Beetle
Dynastes granti
Photo taken near Payson, Gila Co., Phoenix, Arizona during August.
Scarabaeidae -- Scarab Beetle Family
Found at mid elevations in Arizona, USA from just above 1000 m up to 2000 m. The larvae develop in composting tree stumps. The upper horn is borne on the pronotum of the thorax and the lower is affixed to the top of the head. Females lack large horns ... the males use them for grapling with other males at prime breeding sites.