Tue 2012-04-03 
A female Eupeodes luniger (Diptera: Syrphidae). Recognisable by the black inverted 'Y' on its frons (forehead) and by the fact that the yellow spots on the abdomen do not quite reach the lateral margins. Identification by Janet 'blowave' here.
Photos taken in Whiteknights Park, Reading, UK, on 2010-09-19.
Mon 2012-04-02 
A male Epistrophe eligans (Diptera: Syrphidae). The golden thorax is the most obvious feature of this species. The abdomen varies from almost all black, as with this one, to an almost Syrhpus-like banding (see here). The males tend to be darker than the females.
Photos taken in the Wilderness, Whiteknights Park, Reading University grounds, Reading, UK, on 2012-04-01.
Sun 2012-04-01 
What I think is a willow flea beetle, Crepidodera aurata (Coleoptera: Chrysomelidae). Apparently the swollen hind femora enable it to jump like a flea. This is probably a female because the males have black wing-cases.
Photo taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-11-03.
Sat 2012-03-31 
A female Leucozona glaucia (Diptera: Syrphidae). And this is a male of the same species:
Photos taken above Hutton Village, near Guisborough, North Yorkshire, UK, on 2010-08-10 (the female), and in Bousdale, also near Guisborough, North Yorkshire, UK, on 2010-08-08 (the male).
Fri 2012-03-30 
From earlier this month: a pair of cluster flies, a Pollenia sp (Diptera: Calliphoridae), mating. In this species the females are significantly larger than the males.
Photos taken in Whiteknights Park, Reading, UK on 2012-03-10.
