Posted by Martin Cooper on 10-09-2014 09:02
#1
Small black fly found on 26 Aug 2014 on bushes near a stream at Martlesham, East Suffolk, TM252473.
I keyed this as Borophaga incrassata using the keys to British Phoridae in RES Vol 10.6 Scuttle Flies (RHL Disney, 1983).
I would appreciate a second opinion on the ID.
Is it possible to tell the sex of this specimen from the following photos?
Best wishes,
Martin
Posted by Martin Cooper on 17-09-2014 08:34
#7
I would be very grateful for a second opinion on the identification of this small black fly found on 26 Aug 2014 on bushes near a stream at Martlesham, East Suffolk, TM252473.
Face about 1mm across, wing about 3.5mm long.
This was my reasoning... all the characteristics are visible on the photos, I think.
Using RES Vol10.6 Scuttle Flies (RHL Disney, 1983)
Key to Genera (p15)
1 With wings and halteres.
4 No transverse combs of stoutish hairs on dorsal face of hind tibia.
6 Vein 3 with at least 5 fine hairs along its dorsal face.
7 Tibia with one or more isolated bristles in upper two-thirds, as well as apical bristles.
8 Hind tibia with a dorsal, longitudinal palisade-like row of stoutish hairs in addition to isolated bristles and scattered hairs. Vein 3 unforked --> Borophaga (p 19)
1 Tip of vein 3 doesn't form a swollen distal portion.
4 Ocellar triangle expanded into an elevated protruberance, and anterior ocellus transversely elongated so that it is at least 3x broader than high. Hind tibia with a strong anterior bristle in upper half. Vein 3 unforked.
5 Elevated protruberance bearing ocelli broader (fig 23). Front tibia with at least 2 postero-dorsal bristles. In both sexes the cerci are broadly ovoid and covered in densely-crowded fine hairs --> incrassata
Comments, please.
Martin
Posted by Tony Irwin on 18-09-2014 11:24
#8
OK for
incrassata, I'd say. Genitalia photo not very clear, but on balance I'd say female
Posted by Martin Cooper on 18-09-2014 20:56
#9
Thanks Tony.
I know the NBN Gateway isn't very well regarded by some Dipterists, but I always check for previous records and was pleased to see that the only record for B incrassata in E Suffolk was in 1981 by none other than RHL Disney himself!
Best wishes,
Martin