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Other factors include the Hairs on the scutellum and thorax area at first glance could be mistaken for E. interuptus
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I'm not aware that the hairs on the thorax are important to an ID of pertinax? Of course, the one thing which really makes it pertinax is that the front and mid tarsi are entirely orange.
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Lat/Lng: 52.3, 0.0
OS grid ref: TL4070