Light-trap studies were conducted to determine the dominant scarab species collected from turf areas in West Texas, the time and height of adult flight, and the effect of trap orientation.Phyllophaga crinitaBurmeister andCyclocephala pasadenae(Casey) were the most abundant scarab species collected, comprising ca. 89 and 11% of the total beetles caught, respectively. The peak flight ofP. crinitaoccurs 30 min earlier thanC. pasadenae.Trap orientation had no significant effect on the number of beetles collected of either species. The proportion of males exceeded 75% in both species. Vertical stratification was found in both species, but was most pronounced inP. crinita.Collections of both species were greatest at heights close to soil level.