Barks and choruses of Alouatta coibensis trabeata, and Alouatta palliata aequatorialis, were analyzed to compare the frequency bands within their calls. Significant differences were found in number of frequency bands and maximum frequency. Further, A. coibensis produced longer series of barks than did A. palliata, unlike palliata, coibensis females contributed to bark series. Choruses differ between the two forms in total duration, time intervals, and frequency numbers. In both species, females participated in and sometimes took a leading role in daybreak choruses duels with other groups. We consider some characteristics of the howler vocalization that can be affected by anthropogenic activities. This study provides basic information on the previously little-known vocalizations of A. coibensis, and spectrogram data of other species of the Alouatta genus that could be generally compared.
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