Tonboroid S

Tonboroid S is a dragonfly Mechaniloid enemy from Mega Man X4 that appears in the first part of the Opening Stage, Sky Lagoon. It attacks by grabbing X or Zero and using its tail to sting and drain health from them. They can escape from Tonboroid S' grab by mashing the directional buttons. 

Etymology
Tonbo (トンボ) is Japanese for dragonfly.