Bloodmeal sources for sympatric species A and B of Anopheles quadrimaculatus in an area of Mississippi were identified using an indirect enzyme-linked immunosorbent assay. Females had fed only on 6 species of mammals including dog/fox, pig, opossum, raccoon, cottontail rabbit and white-tailed deer. The latter species was the predominant host, representing 96.7 and 89.5% of the bloodmeals taken by species A and B, respectively. No marked difference in feeding patterns was found.