Biology of Andrena (Callandrena Sensu Lato) Asteris Robertson (Hymenoptera: Andrenidae), an Eastern Aster Specialist that Makes a Very Deep Nest Anna C. Espinoza, Katherine R. Urban-Mead, Mark A. Buckner, Nathalia Flórez-Gómez, Jordan G. Kueneman, Bryan N. Danforth "Biology of Andrena (Callandrena Sensu Lato) Asteris Robertson (Hymenoptera: Andrenidae), an Eastern Aster Specialist that Makes a Very Deep Nest," Northeastern Naturalist, 29(4), 474-491, (4 January 2023) Here we present the first description of nest architecture, immature stages, and brood-parasitism of Andrena (Callandrena s. l.) asteris (Aster Miner Bee) and the first description of the nesting biology of any Callandrena in eastern North America. Brood cells varied from 50 to 91 cm in depth, making this the deepest solitary bee nest recorded in northeastern North America. Additionally, we assembled data on soil texture, phenology, geographic distribution, and host-plant preferences. By modeling publicly available observation data, we find that areas of peak habitat suitability for A. asteris are in proximity to coastal and inland shorelines and major water courses. Our results corroborate a recent assessment of the conservation status of New York pollinators, which ranked A. asteris as “vulnerable”.