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Male or female?
Posted: Sat Oct 16, 2010 10:24 pm
by Paul Wetton
I know this is a Chalkhill Blue but to my mind it appears to have a female type hindwing and a male type forewing on the underside. From what I recall the upperside appeared to be a completely normal male colouration.
Do male Chalkhill Blues have such brown undersides to the hindwing or is this some sort of intersex individual.
I welcome your thoughts
Thanks
Paul
Re: Male or female?
Posted: Sat Oct 16, 2010 11:48 pm
by Vince Massimo
Hi Paul,
I posed a similar question recently after I found a couple of Chalkhill males with quite different underside colours to my expected norm.
Here they are compared to a "normal" individual.
![IMG_4574-01G.jpg (137.17 KiB) Viewed 319 times Male with dark underside](./files/thumb_3678_a37b4f28c02884b2f1df0ea69285f9b0)
- Male with dark underside
![IMG_4623-01G.jpg (118.54 KiB) Viewed 319 times Male with pale underside](./files/thumb_3678_2f8e75da12645f0d226e3cb0bd103027)
- Male with pale underside
![IMG_4618-01G.jpg (135.65 KiB) Viewed 319 times Male with normal underside](./files/thumb_3678_e3052366e7af968a72f24328a0db9fb3)
- Male with normal underside
All were taken in the same location on the same day.
I reserve any judgement on the intersex question, but I recall that the answer I got from Felix at the time was that these were within the normal range of colour variation for this species. However I cannot find that particular thread at the moment.
Vince
Re: Male or female?
Posted: Sun Oct 17, 2010 7:32 am
by Paul Wetton
Hi Vince
I've noticed some very pale through to dark individuals at a few sites. This one struck me as being more unusual as the hindwing colour appears to be very gingery brown as in most of the females I see. It could be an effect of the light but this still is actually a video grab and the colour stayed the same even when this individual turned in the light.
Cheers
Paul
Re: Male or female?
Posted: Thu Oct 28, 2010 10:42 am
by Piers
Hi Paul,
Chalkhill Blues are famously variable in respect of the underside ground colour, ranging from pure white (ab. alba) to deep slate grey (ab. pulla), chocolate brown (ab. castanea), or ochre yellow (ab. fulvescens; not infrequent on Portland).
Your specimen can be referred to as ab. fuscescens, first described by JW Tutt as male specimens with forewing undersides grey with hindwing undersides distinctly tawny-brown. This description seems to match your specimen rather well.
Felix.
Re: Male or female?
Posted: Thu Oct 28, 2010 12:18 pm
by Paul Wetton
Excellent.
Once again many thanks Felix.
What books or websites, if there are any, would you recommend for determining what abs. are present in Britain. I find this subject extremely interesting and being a bit of a clepto I enjoy photographing and filming these abs.
Thanks again
Paul