#3 Cuckoo Wasp
A dozen Cuckoo Wasps Chrysis angolensis visited the fennel flowers throughout September. Easy to identify, they are the only Cuckoo Wasp with entirely black wings. The last abdominal segment is always darker than the other segments.
The females have a long egg-layer (ovipositor) that pierces the nest cells of Mud Daubers and Potter Wasps. A few Potter Wasps Eumenes were here earlier in the summer…
and a few of the Black and Yellow Mud Daubers Sceliphron caementarium.
The Blue Mud Dauber had several nests under the eaves of the car port. I suspect this Cuckoo Wasp also parasitizes the Blue, given the number present on the fennel. Photos on BugGuide show a Blue Mud Dauber nest with Chrysis angolensis present.
The Blue often flies right into a spider nest and shakes it, hoping the spider will come out to investigate. Sometimes they look like they’re hanging in mid-air.
Both the Black & Yellow and the Blue Mud Dauber hunt spiders to feed their young, helping to reduce the number of spider webs under the eaves of the house.