Diptera.info :: Identification queries :: Diptera (adults)
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 Tabanus - head characters
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| Tony T |
Posted on 02-08-2007 16:10
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 Member Location: New Brunswick, Canada Posts: 664 Joined: 08.02.07 |
31 July 2007, New Brunswick, Canada. Tabanid season is winding down with just a few species active in August. One very abundant species in August is Tabanus nigrovittatus, on salt marshes. This head shot shows characteristics that separate Tabanus from Hybomitra: Tabanus: eyes bare (no hairs); eyes often without stripes or pattern; absence of an ocellar tubercle at top of frons. Tony T attached the following image:  [47.05Kb] |
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| jorgemotalmeida |
Posted on 02-08-2007 18:17
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
Tabanus glaucopis has 3 stripes on the eyes.  Is there any exception for hairy eyes in Tabanus? |
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| Zeegers |
Posted on 02-08-2007 18:48
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Member Location: Soest, NL Posts: 19146 Joined: 21.07.04 |
Yes, there is. T. quatuornotatus has 3 bands and hairy eyes, still is a Tabanus. So, eyes bare and/or other number than 3 bands implies Tabanus, but the opposite is not true. On the other hand, nearly each larger horsefly with 2 large orange sidemarkings is bound to be Hybomitra, with T. tergestinus as notorious exception. In all cases, the tubercle feature as mentioned by Tony is decisive... (and even then, in H. peculiaris group it is reduced....) This is all Old World truth Theo |
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