In many regions of the United States, the species of Phyllophaga important to turfgrass quality have not been identified. Relatively few studies have been conducted on the biology and damage potential of the known Phyllophaga turf pests. Currently species most likely to be economic pests of turfgrasses in Oklahoma are unknown. The objective of this study is to determine the species composition and seasonal occurrence of Phyllophaga associated with turfgrasses in Oklahoma over a two year period. A single black light trap was placed at eight different locations through out the state for collection of adult Phyllophaga. Data suggest that the majority of species collected fly in May and June, while a few species fly early in mid-April, and late into July. Over the two year collection period, eighteen different species of Phyllophaga were collected and identified.