Greene's Giant Ichneumonid Wasp

Megarhyssa greenei is a species of large ichneumon wasps. It is known from the United States and Canada. It is very similar in appearance to Megarhyssa macrurus, but the latter species has a relatively longer ovipositor (about 2x the total body length, where greenei is only slightly greater than 1x), and usually has more extensive dark wing markings. M. greenei also lacks the dark striping on the face present on M. macrurus.