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View Thread :: Identification queries :: Diptera (adults)
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Update: Dolichopodidae male & (new) female --> Hercostomus sp.
#1 Print Post
Posted on 05-01-2018 20:06

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

Hey, caught this male indoors in January. Help with determination very much appreciated.

More pictures can be found here:

Carnifex attached the following image:

Edited by Carnifex on 01-02-2018 19:39
#2 Print Post
Posted on 05-01-2018 20:10

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

Carnifex attached the following image:

Igor Grichanov
#3 Print Post
Posted on 06-01-2018 18:53
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Location: St.Petersburg, Russia
Posts: 1318
Joined: 17.08.06

Hercostomus, maybe rusticus
Igor Grichanov
Keith Short
#4 Print Post
Posted on 15-01-2018 19:48

Location: Loves Park, Illinois, USA
Posts: 35
Joined: 10.07.12


I see that you found this indoors in January. I am puzzled. Wild doli in Austria I would expect to be hibernating in the winter. Do you have a greenhouse or indoor plants where this may have emerged from the soil?

Kind regards,

Keith Short
Northern Illinois, USA
#5 Print Post
Posted on 21-01-2018 11:24

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

Thanks Igor, for the determination.
I would like to identify it further, if possible. Such a large genus, though... Shock

Dear Keith,

I just have normal potted plants, one of which was kept outside in the garden until late autumn.

I caught two specimens, a male and a female, within two days. Unfortunately the female escaped before I could investigate it. Was hoping for more to find, didn't happen.
Do you think the adults were overwintering or there were larvae developing in the soil?
#6 Print Post
Posted on 01-02-2018 19:14

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

it is not over yet: Today (Feb 1st) I caught a female, indoors again.
Carnifex attached the following image:

#7 Print Post
Posted on 01-02-2018 19:28

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

Dear Igor,
both specimens key to species-group IV (femora black; lower postocular setae white).

I noticed that you published quite a lot about this genus, unfortunately most of the articles I have no access to. However, in the "checklist and keys to Dolichopodidae (Diptera) of the Caucasus and East
Mediterranean" both of my flies, male and female, key perfectly to H rusticus:

Male - Calypter with black cilia; Postpedicel twice as long as broad; hind basitarsus shorter than 2nd
Female - Calypter with black cilia; Postpedicel 1,5x longer than broad; hind basitarsus shorter than 2nd

I wonder if you know if there are any Middle European species that, based on these features, can be confused with H rusticus.

Best, Lorin
#8 Print Post
Posted on 01-02-2018 19:35

Location: Vienna, Austria
Posts: 345
Joined: 23.06.15

Dear Keith,

I moved the potted plant into another room, and now the flies appear there. So they might in fact come from the soil.
I found this article (in German) about phenological appearances of Dolichopodidae in Switzerland, and there have been some cases of Hercostomus rusticus in Dezember and February.


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11 December 2018 19:51


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10.12.18 00:08
Hello, I'm having a problem posting new threads, as the "No new Threads allowed..." is showing up on all of the forums. Is there some sort of thread limit I've exceeded?

03.12.18 11:19
SabineH: you have to be logged in to see "New Thread" in the right upper corner of each "forum" site. In the case of accidental logout you have to start over.

30.11.18 04:57
If anybody has any PDFs on Diptera of Southeast Asia I would love to have copies of them, mrgordonramel@yaho

29.11.18 20:13
Hello, tried to start a thread but upload did not work. And now I cannot find the button "New post" anymore. Please, help. Thanks

13.11.18 12:49
Hello Can any1 give me a contact email for Entomologie heute Thx

11.11.18 18:28
I don't have it, sorry

11.11.18 12:51
@Rafael_Carbonell What I would like is a pdf copy of Key to the Families of Diptera.

10.11.18 19:29
@Gordon, what exactly do you need? All the Oosterbroek literature is here:

09.11.18 15:56
Does anybody have a PDF of Oosterbroek they could email me? I had one but it didn't make it to Cambodia.

25.10.18 12:03
Da mayfly man is in da house!

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