Polyphylla decemlineata, commonly known as the Ten-lined June Beetle, is found in the western United States and parts of Canada. It inhabits coniferous forests and is known for its distinctive striped wing covers. The beetle is nocturnal, and males are known for their noisy flight patterns when searching for females.

Polyphylla decemlineata, commonly known as the Ten-lined June beetle, is native to North America. It is predominantly found in the western regions of the United States, including states like California, Oregon, Idaho, and Nevada. It also extends into parts of southwestern Canada.

The Ten-lined June beetle typically inhabits areas with sandy soils, which are conducive to its life cycle needs, particularly for the larvae which develop underground. Its preferred environments include coniferous and mixed forests, where the soil composition supports its burrowing lifestyle.

Polyphylla decemlineata occupies a niche as both a herbivore and decomposer. The adult beetles primarily feed on the foliage of trees and shrubs, while the larvae feed on the roots of grasses and other plants. This dual role affects soil and plant health, contributing to ecosystem dynamics by recycling nutrients.