As I was working on my computer (in my office) this afternoon, a small critter was flying around my head. Based on my current location (in a building housing at least 3 Drosophila labs) and my previous whereabouts (our lab’s fly room), I surmised that this was most likely a member of genus Drosophila. My suspicions were confirmed when, at 7:45pm (about 3 hours after I first noticed the pest), she (I think it was a she from the quick glance I got) landed on my computer monitor. Upon closer inspection (although not long enough to adequately surmise the sex) I noticed the fly was too lightly pigmented to be one of mine (rejecting the hitchhiker from the fly room hypothesis), but rather an escapee from one of the labs working with that cosmopolitan hexapod, Drosophila melanogaster.
Pictures comparing the two species in question can be found below the fold. And, yes, she took off from my monitor and is still flying around the office.