Here I just wanted to show you how Chrysoexorista spp. loose their colour almost over night. This first photos show how the Chrysoexorista looked a few hours after it had been removed from the malaise trap alcohol and the last 3 show how it looks now:
This genus is one of my favourites, but from the rather drab greasy-looking colouration you might be forgiven for wondering why? However, their gorgeous metallic green colours only show in life or when freshly removed from alcohol – but when they have dried out the colours are all lost and all that is left is this rather oddly coloured browny/mustard colouration:
This is possibly the most beautiful tachinid I have ever seen. The photos say it all!
In this taxon the irredescent green colour comes from layers of dusting, rather than the usual duller, green-coloured pigments found in European genera, such as Gymnocheta and Lucilia. It is worth noting that days after this photo was taken and the specimen had dried the green coloration had completely faded to brown. I haven’t experimented with putting it back into alcohol to see if the colour returns.
EDIT (1/3/2010): After reading Woodley & Arnaud (2008) it seems that this might be a species of Chrysoexorista – eyes hairy, mouth not projecting, dark femora etc. (obviously NOT Eulobomyia)
EDIT (Monty Wood 26/9/2010): This is indeed Chrysoexorista sp.
* Woodley, N.E. & Arnaud, P.H. (2008) Lobomyia neotropica, a new genus and species of Tachinidae (Diptera) from the Neotropical Region. Zootaxa 1783: 31–39 (2008)