Big-eyed bugs have been well documented as predators on a diverse group of arthropod prey in turfgrasses; however, little is known about the big-eyed bug species associated with buffalograss, or their feeding habits relative to the western chinch bug, Blissus occiduus Barber. This research documented that Geocoris uliginosus (Say) was the predominant big-eyed bug species associated with buffalograss, obtained information on its feeding behavior, and characterized predation rates. Laboratory studies documented G. uliginosus, as a predator of B. occiduus. While all life stages of B. occiduus were attacked by G. uliginosus, predation was greater on 1^st through 4^th instars than on 5^th instars or adults. Low 5^th instar and adult chinch bug mortality was likely the result of their larger biomass, as well as their superior size and strength compared to younger (1^st through 4^th instar) chinch bugs. The mean number of 1^st through 3^rd instar chinch bugs consumed by G. uliginosus at each evaluation period was higher than for 5^th instar or adult chinch bugs. Based on this research, chinch bug management decisions should take into consideration big-eyed bug densities, especially when the majority of B. occiduus are early (1^st–2^nd) instars.