. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BROWN: ANT TRIBE ECTATOMMINI 299 striking is the brown variant, contrasting with the more familiar yellowish types from farther north and south, as well as from this same area in the middle of the range. E. acrista differs modestly from tuberculatum in having the occipital margin of the head more ronnded as seen in full-face view; I have specimens of this kind from the Parana River, Paraguay (Fiebrig leg.). Other samples from central South America may represent transi- tions to acrista from tuberculatum, but at presen

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BROWN: ANT TRIBE ECTATOMMINI 299 striking is the brown variant, contrasting with the more familiar yellowish types from farther north and south, as well as from this same area in the middle of the range. E. acrista differs modestly from tuberculatum in having the occipital margin of the head more ronnded as seen in full-face view; I have specimens of this kind from the Parana River, Paraguay (Fiebrig leg.). Other samples from central South America may represent transi- tions to acrista from tuberculatum, but at present the evidence is not as complete as it should be to dismiss acrista as a southern peripheral variant of tuberculatum.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum