Subject: Weird bug followed me at work
Geographic location of the bug: Denison, TX
Date: 07/24/2018
Time: 09:48 AM EDT
Your letter to the bugman: This bug was on the catwalk and quite aggressive. We also had one come out of the sink inside.
How you want your letter signed: Assassin Bug?
This is a Robber Fly and not an Assassin Bug and those gorgeous green eyes are pretty diagnostic that it is Microstylum morosum, a species also pictured on BugGuide. According to Beetles in the Bush: “Until recently, Microstylum morosum was considered a Texas-endemic. However, Beckemeyer and Carlton (2000) documented this species to be much more broadly distributed in the southern Great Plains (from Texas up into Oklahoma and Kansas and west into New Mexico, Arizona, and Colorado), and Warriner (2004) recorded it shortly afterwards in Arkansas.”
