Black Hairstreak

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John W
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When will Black Hairstreak appear this year?

Postby John W » Thu May 31, 2012 4:36 pm

Hi everyone, I was wondering when people expect Black Hairstreaks to be flying this year? I will be travelling through Bucks on June 16th - are they likely to be around by then? I know there were plenty out at that time last year but last year we had that exceptionally warm spring.

Thanks
John

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David M
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Re: Black Hairstreak

Postby David M » Thu May 31, 2012 7:41 pm

Last year, Black Hairstreaks hit their stride in early June (due, no doubt, to the very hot early-mid spring we enjoyed). Normally, mid June is the time one can expect this species to emerge, so I would say that 16th June is probably a good time to go looking for them (assuming we don't drift back into a weather pattern that continually throws up rain and 13c temperatures).

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NickB
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Re: Black Hairstreak

Postby NickB » Fri Jun 01, 2012 7:52 am

In Cambs, it is usually the first week of June that sees first emergences; anything between the last week of May and the second week of June seems possible, depending on the weather. It is such a short flight period to catch them looking good.....
N
PS None reported here, yet.....
"Conservation starts in small places, close to home..."

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Padfield
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Re: Black Hairstreak

Postby Padfield » Sat Jun 02, 2012 5:56 pm

Tim Cowles saw his first of the year near Lyons on 29th May. Today, males were numerous near Geneva but I saw no females (unless the one below is a female - I'm not sure now). The season in Europe has begun and it will be coming to a UK wood near you very soon... :D

Image

Guy
Guy's Butterflies: http://www.guypadfield.com

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NickB
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Re: Black Hairstreak

Postby NickB » Sat Jun 02, 2012 7:48 pm

Nice shot. I too, Guy, am never 100% sure of the male/female, especially if I don't see the abdomen clearly (and, as you will attest, even then I am known to be wrong :lol: )
Tolman and Lewington suggest to me, in layman's terms, that the female has slightly more rounded fore-wings, with more orange and less black expressed on the underside of these fore-wings, than the male. Thomas and Lewington also suggest that the the female is a more chestnut brown than the slightly darker brown of the male.
One I took last year; from the shape of the abdomen, I would say female....?
B_H_4_low_Monks_Wood_3rd_June_2011.jpg

How about this one, Guy?
B_H_1_low_Monks_Wood_1st_June_2011.jpg

And here is one from 2 years ago that has two lovely sets of tails....
BH_5_low_Brampton_Wood_12_06_2010.jpg

Soon for 2012 indeed :)
"Conservation starts in small places, close to home..."

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Padfield
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Re: Black Hairstreak

Postby Padfield » Sat Jun 02, 2012 8:24 pm

Your first one clearly shows the oval male sex brand in relief under the forewing, so I go for male for that... And the second one is definitely a female. Is the absence of a visible sex brand (when the view is good enough) sufficient to diagnose female?

Guy
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David M
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Re: Black Hairstreak

Postby David M » Sat Jun 02, 2012 8:30 pm

Your eye for detail is amazing, Guy.

I'd never have noticed that difference between the two butterflies, but now that you've highlighted it, when I revisit the images it's obvious.

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NickB
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Re: Black Hairstreak

Postby NickB » Mon Jun 04, 2012 8:17 am

padfield wrote:Your first one clearly shows the oval male sex brand in relief under the forewing, so I go for male for that...
Guy

Thanks for being so gentle on my poor ID skills......that sex brand is so evident now I look at it!
Usual BH weather over here....it generally seems to be damp and dull about their emergence time....
N
"Conservation starts in small places, close to home..."

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John W
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Re: Black Hairstreak

Postby John W » Wed Jun 13, 2012 10:53 pm

Just wondered if anyone has seen any Black Hairstreaks this year yet? I could make a trip to Bucks on Friday but the weather forecast is no good, and I'm not sure if they're out yet anyway :(

Cheers
John

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NickB
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Re: Black Hairstreak

Postby NickB » Thu Jun 14, 2012 3:46 pm

None yet - went out today looking....
"Conservation starts in small places, close to home..."


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