Subject: Large robber fly
Geographic location of the bug: Pasadena Ca
Time: 05:19 PM EDT
Your letter to the bugman: These photos are taken around a backyard pond in Pasadena Ca. Although I would like to know what species the dragonfly is (it has just emerged and is still clinging to it’s niad shell) my main qestion is in regards to the other photo. What kind of robber fly do you think this is? It’s by far the largest one I’ve seen. The plastic cap of the garden stake next to it is 19 millimeters in diameter.
How you want your letter signed: Roy
Based on images posted to BugGuide and the reported range, we believe your Robber Fly might be Promachus princeps.