Eighty Passerculus sandwichensis were collected for a food habits study from 1959 to 1961 and were injected with 1 cc of 10% formalin immediately after death. The stomach contents were compared with those of 47 specimens collected from 1877-1938 which were presumably not injected at the time of death. The injected birds contained 21/2 times as many animals per bird as the non-injected and Homoptera comprised over 30% of the animals in injected birds as against 9% in non-injected. Two birds fed by hand, then killed and examined, demonstrated very rapid digestion. This is pertinent to the interpretation of food habits studies bases on stomach analyses.