T.G.I.Flyday – Triorla interrupta

Triorla interrupta (male) | Calico Rock, Arkansas

While I was visiting the glades near Calico Rock, Arkansas this past June, I went into town to look along the White River.  With the amount of sandstone bedrock in the area, I thought there I might find sandy loam deposits along the river of the type preferred by Cylindera cursitans (ant-like tiger beetle).  While I didn’t find any of the beetles, I did see this robber fly (managing only this single shot before it flew off), which I take to be the male of Triorla interrupta based on the pattern of abdominal coloration (the first two segments partially black, followed by two almost wholly black segments).  According to BugGuide, this is the only North American species of the genus (a second occurring from Panama to Argentina), and Herschel Raney considers it to be the most common robber fly in Arkansas.

Copyright © Ted C. MacRae 2011

About Ted C. MacRae

Ted C. MacRae is a research entomologist by vocation and beetle taxonomist by avocation. Areas of expertise in the latter include worldwide jewel beetles (Buprestidae) and North American longhorned beetles (Cerambycidae). More recent work has focused on North American tiger beetles (Cicindelidae) and their distribution, ecology, and conservation.
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5 Responses to T.G.I.Flyday – Triorla interrupta

  1. Well you certainly nailed the one shot it gave you! Very nice!

    • Thanks, Morgan. I was trying to get a little more of a frontal shot, but this one actually turned out to be good because of how clearly it shows the diagnostic abdominal markings.

  2. Yes, a very clear and detailed picture of a robber fly. Well done, especially since you had only one shot at it.

    Steve Schwartzman
    http://portraitsofwildflowers.wordpress.com

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