Food, mostly in intestines, of two adult females of _T. s. emoryi_ collected on June 12-14, 1959, from the Río Grande at Lajitas, Brewster County, Texas, was examined. One female, KU 51961, contained little food and mostly plant fragments; because the stomach or intestine was not full of plant fragments, this food probably was ingested incidentally to the few insects present. Another female, KU 51955, contained insects, which were identified by Dr. George W. Byers, Department of Entomology, University of Kansas, as follows: 1) Coleoptera, Dryopidae, genus _Helichus_, most numerous, 350 to 400 individuals; 2) Coleoptera, Scarabaeidae, genus _Phyllophaga_, one individual; 3) Odonata, Coenagrionidae, fragments, probably one individual; 4) Hymenoptera, Sphecidae, subfamily Bembicinae, one individual; 5) Ephemeroptera; fragments of naiad; and 6) a few plant seeds, pieces of slender roots, weed stems and a couple of fragments of tree bark. The scarab and wasp probably fell into the water and were eaten. TABLE 6. Kinds of Insects Found in Stomachs and Intestines of 11 Specimens of Trionyx m. muticus (Eight Adult Males and Three Immature Females, 9.0 to 12.5 cm. in Plastral Length) From Douglas County, Kansas. Frequency of Occurrence (Approximate Number of Individual Insects/Number of Stomachs in Which Found) Is Given for Each Item Listed. Fragments of Insects Represent Adults Unless Otherwise Noted. ==========================================================+=========== FOOD ITEM | Frequency ----------------------------------------------------------+----------- Orthoptera | Locustidae | 1 | Ephemeroptera | Unknown (naiad) | 1 | Odonata | Anisoptera (naiad) | 3/3 Zygoptera (naiad) | 4/2 | Plecoptera | Unknown (naiad) | 2/1 | Homoptera | Cicadellidae | 20/7 | Hemiptera | Lygaeidae | 1 | Neuroptera |