Archive for May, 2021

Dance Flies and Missing Moths

May 5, 2021

On Skye last week I spotted some impressive flies which turn out to be Empis borealis, a species of Dance Fly or Dagger Fly. Thanks to Tony and Seth for i.d. This particular species of fly exhibits sex-role reversal in its mating process, with female flies aggregating in swarms to compete for male choice. Female fly swarms change their flying behaviour in the presence of males, who present nuptial gifts to females before mating. The name Dagger Fly comes from the long downward-pointing probosis used for spearing other insects.

Empis borealis

Prior to this year Pammene giganteana (Early Oak Piercer) was known in Scotland from just four VC’s and a handful of records. However, it is known that it comes to lures for Grapholita molesta (MOL), Grapholita lobarzewskii (SKI) and Grapholita funebrana (FUN).  Use of these lures has resulted in many new records in England and southern Scotland.

The larvae feed on spongy oak galls but oak trees are scarce on Raasay. There are a few near Eyre and some near Dun Borodale and in both places I have had a go with a MOL lure. The weather has been irritatingly cold, only reaching 6 or 7 C most days – the absolute minimum for these micromoths to fly, and I have not succeeded. Maybe next year I will try in Sleat where there is a lot more oak.

Lure on oak at Eyre

Late April – Insects

May 1, 2021

Micromoths have continued to provide interest though it has turned cold in recent days which is limiting what’s about -not just in terms of micromoths. This one is Philedonides lunana (Heath Twist), not a rare moth but one with very few records locally. I spotted two in the Manish area of Raasay.

Philedonides lunana (Heath Twist)

More interesting was this little female Heringocrania (Eriocrania) unimaculella (White-spot Purple) with a forewing length of just 5 mm found near Kinloch on Skye

Heringocrania (Eriocrania) unimaculella (White-spot Purple)

As ever I am grateful to NIgel Richards for i.d.s.

I have a variety of larvae that I am trying to rear so that their identification can be confirmed. My Bucculatrix nigricomella is now a pupa, so I wait with bated breath for this rather smart little moth to emerge.

I have been checking numerous stands of Vaccinium vitis-idaea (Cowberry) on Raasay and Skye in the hope of finding lepidopterous leaf mines, but with no luck so far.

Butterflies seen so far this year are Small Tortoiseshell, Peacock, Green-veined White and Green Hairstreak.

Green Hairstreak

I spotted a Common Groundhopper and a Common Green Grasshopper nymph at Fearns on Raasay, the former being something I have seen very rarely hereabouts.

Common Groundhopper (Tetrix undulata)

I also have a number of bugs that I hope to get help with e.g.:

Bugs from Kinloch