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Diptera.info :: Identification queries :: Diptera (adults)
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Phoridae: Borophaga (Peromitra) incrassata?
Martin Cooper
#1 Print Post
Posted on 10-09-2014 09:02
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Location: Ipswich, Suffolk
Posts: 628
Joined: 01.05.12

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
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Martin Cooper
#2 Print Post
Posted on 10-09-2014 09:03
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Location: Ipswich, Suffolk
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Joined: 01.05.12

Hind tibia
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Martin Cooper
#3 Print Post
Posted on 10-09-2014 09:03
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Location: Ipswich, Suffolk
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Side of thorax and head
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Edited by Martin Cooper on 10-09-2014 09:04
 
Martin Cooper
#4 Print Post
Posted on 10-09-2014 09:05
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Dorsal face of base of wing
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Martin Cooper
#5 Print Post
Posted on 10-09-2014 09:06
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face
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Martin Cooper
#6 Print Post
Posted on 10-09-2014 09:07
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Front tibia and end of abdomen
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Martin Cooper
#7 Print Post
Posted on 17-09-2014 08:34
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Location: Ipswich, Suffolk
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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
 
Tony Irwin
#8 Print Post
Posted on 18-09-2014 11:24
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OK for incrassata, I'd say. Genitalia photo not very clear, but on balance I'd say female
Tony
----------
Tony Irwin
 
Martin Cooper
#9 Print Post
Posted on 18-09-2014 20:56
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Location: Ipswich, Suffolk
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Joined: 01.05.12

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
 
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