Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Swellings, Polymnia

Swellings, Polymnia
Decorah, Winneshiek County, Iowa, USA
February 14, 2017
Swellings on winter stems of leaf-cup, Polymnia

The swelling on the right and the one on the left were both empty and hollowed-out inside, with a tunnel leading from the swelling down through the stem below it. I only collected a small portion of the stem so I don't know how far down the rest of the plant the tunnel went, or whether the tunnel-maker was at the end of it. The middle swelling contained frass-like powdery black material surrounding a dead wasp that seemed to be halfway between the pupa and the adult stage; also, there was no tunneling in the stem above or below this swelling. In its shape and in having powdery black material, the middle swelling reminded me of these galls

A similar-looking gall on Polymnia here in northeastern Iowa, from which MJ Hatfield reared two wasps:

Moved from Unidentified Galls.


Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.