subcosta

Accessory subcostal vein: the vein given off from the subcosta and branching toward the apex of the wing in Perlidae.

Costa: any elevated ridge that is rounded at its crest: the thickened anterior margin of any wing, but usually the primaries: in Comstock, the vein extending along the anterior margin of the wing from base to the point of junction with subcosta.

Subcostal crossveins: in Odonata, are between subcosta and media on the basal side of the first antecubital.

Subcosta, when it refers to a vein and subcostal in a cell.

Antenodal cross veins: Odonata; extend between costa and subcosta, and between subcosta and media, from the base to the nodus, forming the ante-nodal or ante-cubital cells: = ante-cubital.