. Bulletin. Science; Natural history; Natural history. Figs. 13-18. Myrmecocystus spp. 13-14, male, frontal view of head: 13, M arenarius and 14, M. christineae, scale = mm. 15-18, mesoscuta of females: 15, M. arenarius; 16, M. christineae, 17, M. pyramicus; 18, M. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy

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