Placosternus difficilis, commonly known as the mesquite borer, is a wood-boring longhorn beetle[1][2] which resembles a black and yellow wasp.

[3] Larvae of mesquite borers are deposited in, among others, mesquite trees, although it has been recorded from a range of hosts and is considered polyphagous.

[4] It has been seen to be attracted to mesquite trees when there is freshly cut or broken limbs and logs.

Adults use nectar and pollen as a food source.

[5][3][6][2] It is known from the United States (California to Texas), Mexico, Honduras, Cuba, and the Bahamas.