Totoro,

What you have there is a flightless cicada nymph that emerged from the ground where it spent from one year to 16 years (from the looks of yours I believe it is a non-periodic cicada), in the ground growing while sucking the sap of tree roots, primarily. It will live a month our two as a winged, flying adult, mate and die. None survive winter.

Before dying, the females lay eggs in slits made high up in tree twigs. The part of the twig beyond the slit dies. The cicada is actually pruning the tree, especially when the periodic cicada, which takes either 13 or 16 years to mature, comes out in massive, synchronized hordes.

During years of periodic cicada's 'invasions', trees in the forest can be seen with a multitude of dead twig tips ( light brown, dead, shriveled leaves attached to foot long twigs, hanging by a thread to the live section of twig below the slit until they soon drop off), where a female cicada slit it and laid her eggs in the slit.

Soon the eggs hatch and the tiny nymphs fall to the ground. There they burrow down and start sucking the root sap of oaks, maples, and the like, and grow for one to nine or more years until they emerge and look like your cicada.

Adult cicadas do eat by sucking sap with their mouths. They could do some damage to a rose, I imagine, but their substantial food source is big, tall trees, where they do acceptable, and mostly negligible damage. They are a significant, awesome native member of our ecosystem. The male's song during late summer evenings is wonderful!

Cicadas can bite with their proboscis. It is painful, but not dangerous. They will only bite defensively if handled, especially carelessly. They do not seek out and attack people.

Sometimes a flying cicada will land on you or crash into your face. They are not among he most graceful of fliers, and their directional control seems erratic. When they fall on their backs they take a fit, struggling to upright themselves. It's amusing to watch them upright themselves and regain their dignity. I like cicadas.

Cicadas are related to leafhoppers!

Moses