The chip call of the Eastern Wood-Pewee (Contopus virens) is a frequently cited feature of that species’ vocal repertoire, but similar calls of the Western Wood-Pewee (C. sordidulus) are usually overlooked. Differences in this call between the two species would aid in field identification of migrants, which rarely sing their diagnostic songs. Cross-correlations of audiospectrograms, comparisons of three audiospectrographic measures, and qualitative analysis of spectrograms show that most chip calls of the Eastern Wood-Pewee are not distinguishable from those of the Western Wood-Pewee, and Eastern chip calls are generally more variable than those of the Western. These analyses also show that the two wood-pewees are more similar to each other than they are to their respective sister taxa. This similarity raises questions about the role of chip calls in the behavior of Contopus species, especially as it relates to potentially shared functions and sources of selection in their nonbreeding ranges.