alternative definition added about 15 years ago by Istvan Miko
The second and largest of the three primary subdivisions of the thorax, bearing the middle pair of legs and, when present, the forewings.
Reference: Goulet, H., and J. T. Huber. 1993. Hymenoptera of the World: An Identification Guide to Families. Research Branch, Agriculture Canada Publication 1894/E., Ottawa, ON 668 pp.
Cross reference:
None provided.