We examined 56 fecal pellets from under a maternity colony of big free-tailed bats (Nyctinomops macrotis) in the Jemez Mountains of northern New Mexico. The most important food items, listed in order of decreasing percent volume, were Cicadellidae, leafhoppers (26.7% volume, 58.9% frequency); Ichneumonidae, Ichneumon wasps (19.3% volume, 35.7% frequency); and Lepidoptera, moths (17.2% volume, 82.1% frequency). Overall, the most important orders as prey consumed, listed by decreasing percent volume, were Homoptera (27.6% volume, 62.5% frequency), Hymenoptera (19.5% volume, 37.5% frequency), Lepidoptera (17.2% volume, 82.1% frequency), Hemiptera (11.7% volume, 37.5% frequency), and Diptera (10.6% volume, 50.0% frequency). Our study documents an unusually varied diet, as previous studies indicated that these bats fed almost exclusively on moths. Nutrition; Diet; Prey; Feeding behaviour; Ecology; Predators; Land and freshwater zones; Nearctic region; North America; USA Insecta; Mammalian predators; Nyctinomops macrotis; Prey preferences, guano analysis indications; New Mexico; Jemez Mountains; Mammalian predator diet Nyctinomops macrotis (Molossidae); Insect prey; Prey preferences; Food preferences; New Mexico; Jemez Mountains; Insect prey preferences, guano analysis indications none