alternative definition added about 15 years ago by Istvan Miko
In Ichneumonidae, the groove or pit on either side of metasomal segment 1 between its base and the spiracle; it is nearly always present when sternum 1 is free from tergum 1 but absent when tergum 1 and sternum 1 are fused.
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.