Abstract: Macroinvertebrates are crucial to the functioning of aquatic ecosystems. Elucidating the factors that affect their abundance and distribution within aquatic environments is of great importance to the study of freshwater ecosystems as well as to the study of ecosystem coupling. The purpose of this study is to examine the effects of terrestrial subsidy and intraguild predation on dragonfly (Odonata:anisoptera) and crayfish diet. We hypothesized that allochthonous input (terrestrial moths) and intraguild predation between the two predators would decrease the predation pressure on the midge population and that there would be a combined effect of inputs and intraguild predation on the midges. Our data did not support these hypotheses. The presence of allochthonous inputs had no significant effect (P > 0.05), and in treatments where the predators were predators were paired together there was significantly higher predation on midges. Further study and a larger sample size are needed for a more accurate comparison.