Description wikipedia

The ten-lined June beetle or tenlined June beetle (Polyphylla decemlineata), also known as the watermelon beetle, is a scarab beetle found in the western United States and Canada. The ten-lined June beetle is most commonly found in the Pacific Northwest region (PNW) but are also spread throughout other parts of the United States (US) such as Colorado or Kansas. They are known as a very common species of beetle. The adults are attracted to light and feed on foliage while the larva feed upon roots of fruit-bearing trees. They can make a hissing sound when touched or otherwise disturbed, which can resemble the hissing of a bat. This sound is made by their wings pushing down, forcing the air out between their wings and back. They can be an agricultural pest affecting a wide range of crops because their larvae feed on plant roots and can weaken or kill the plants.