Dataset description for: JEB-2017-00575_main_data Phenotypic integration in an extended phenotype: among- individual variation in nest-building traits of the alfalfa leafcutting bee (Megachile rotundata) Raphael Royauté, Elisabeth S. Wilson, Bryan R. Helm, Rachel E. Mallinger, Jarrad Prasifka, Kendra J. Greenlee, Julia H. Bowsher (Journal of Evolutionary Biology 2018) Corresponding author: Raphaël Royauté (raphael.royaute@gmail.com) Dataset Description: Nests, cell and cap measurement for 60 nests collected during summer 2016 Column description: General information columns: Dissection_date: Date at which nests were dissected (m/d/y) Collection_date: Date at which nests were collected in the field Nest_Id: Indicates the Id code for each nest Cell_nb_pnest: Indicates the number of cells present in each nest Cell: Indicates the position of the cell within the nest in order of construction. Cell number 1 being the first to be built and furthest from the nest cap. Cell_weight: Weight of each cell within the nest (in mg) Nest_length: Total length of the nest including all cells and the nest cap (in mm) Cell_size: Length of each cell within the nest (in mm) Cap_length: Length of the nest cap (in mm) Cap_leaves: Number of leaves involved in the construction of the nest cap Cell_leaves: Number of leaves involved in the construction of the nest cap JDate: Jdate column converted to Julian date format JDate_dev: Julian date expressed as deviation from the mean date during the course of the nast sampling period