Diptera.info :: Identification queries :: Diptera (adults)
 Bibio nigriventris? Bibio cf. johannis (female)
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| Mucha Fero |
Posted on 23-04-2020 07:48
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 Member Location: Posts: 8428 Joined: 27.09.10 |
Bibionidae_Bibio nigriventris (female) is the correct name? Slovak Republic, Malá Fatra, approximately altitude cca 514 m a. s. l. Thank you very much for your help. Best regards. Fote date: 22. 04. 2020.
Mucha Fero attached the following image:  [195.94Kb] Edited by Mucha Fero on 23-04-2020 16:21 |
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| Mucha Fero |
Posted on 23-04-2020 07:49
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Member Location: Posts: 8428 Joined: 27.09.10 |
[quote]Mucha Fero wrote:
Mucha Fero attached the following image:  [195.47Kb] |
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| Mucha Fero |
Posted on 23-04-2020 07:49
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Member Location: Posts: 8428 Joined: 27.09.10 |
[quote]Mucha Fero wrote:
Mucha Fero attached the following image:  [195.31Kb] |
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| Mucha Fero |
Posted on 23-04-2020 07:49
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Member Location: Posts: 8428 Joined: 27.09.10 |
[quote]Mucha Fero wrote:
Mucha Fero attached the following image:  [197.31Kb] |
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| Mucha Fero |
Posted on 23-04-2020 07:50
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Member Location: Posts: 8428 Joined: 27.09.10 |
[quote]Mucha Fero wrote:
Mucha Fero attached the following image:  [196.3Kb] |
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| Zeegers |
Posted on 23-04-2020 08:28
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Member Location: Soest, NL Posts: 19319 Joined: 21.07.04 |
Dear Mucha, the antenna has too many segments for nigriventris. I thinkk, this is a female of B. johannis. Theo |
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| Mucha Fero |
Posted on 23-04-2020 16:17
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Member Location: Posts: 8428 Joined: 27.09.10 |
Theo thank you very much. |
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| libor |
Posted on 23-04-2020 18:44
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Member Location: western Bohemia Posts: 1302 Joined: 30.05.09 |
Theo, why not varipes? Libor |
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| Sundew |
Posted on 24-04-2020 23:04
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3939 Joined: 28.07.07 |
I have the same question. Yesterday I saw a rather similar female; both fit the description by Loew in Linnaea Entomologica (1846, p. 349 https://www.biodi...3/mode/1up). Loew states that the venter of B. varipes females is yellowish, and that the sides of the thorax are partly reddish. B. johannis females, on the contrary, have a completely black abdomen. How reliable are these traits? |
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| John Carr |
Posted on 24-04-2020 23:28
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 Super Administrator Location: Colorado, USA Posts: 10660 Joined: 22.10.10 |
Sundew wrote: I have the same question. Yesterday I saw a rather similar female; both fit the description by Loew in Linnaea Entomologica (1846, p. 349 https://www.biodi...3/mode/1up). Loew states that the venter of B. varipes females is yellowish, and that the sides of the thorax are partly reddish. B. johannis females, on the contrary, have a completely black abdomen. How reliable are these traits? In North America the common species of Bibio have several synonyms based on color variation. Loew redescribed one of Walker's species at least three times. |
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| Sundew |
Posted on 24-04-2020 23:41
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3939 Joined: 28.07.07 |
OK, but are there also B. johannis females with more or less yellow venter? Steven Falk (https://www.flick...181555290/) also says regarding B. varipes females: "They can be very difficult to separate from B. lanigerus but tend to have a yellow venter (black in most other Bibio's)." |
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| Zeegers |
Posted on 25-04-2020 07:30
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Member Location: Soest, NL Posts: 19319 Joined: 21.07.04 |
I said “ I think”. for a reason. I am reluctant to make IDs of females from oicture and to be honst, I am reluctant to make IDs for females without males. If you follow your lead, you end up with more females varipes than males, which is statistically highly improbable. That makes you wonder ... Theo |
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