The name of the site is 'Troupes' and 'Dhimitra' is the name of the modern town closest to it. The general position of Dhimitra in Arcadia is shown in this map:
Here we're looking at the NW quadrant of the Peloponnese; the lavender arrow points to Dhimitra. If we zoom in on this area we can see the road being described by Syriopoulos in his footnote 1 which are indicated more or less roughly in the next map. (Click on it to enlarge.)
On this map I have labelled the names of the towns in Syriopoulos' footnote. The sequence begins with Stavrodromi at the lower R and ends with Koumani at the upper L. The last bit of the road from outside Monastiraki to Koumani is not very good; really a series of dirt roads and this may be the part that Syriopoulos thought was 'not yet ... completed.'.
Now for Dhimitra itself.
The modern town of Dhimitra is positioned at the lower L. Measuring a path from that town to my proposed location for Troupes is just about 1890 m. I admit that the starting point for this lavender line was somewhat arbitrarily chosen but Syriopoulos does not tells us where to begin measuring the 2 km. distance from town to site.
In this post I have started with the answer. With a high degree of confidence it can be said that the site of Troupes is at37.786502° N, 21.932709° E. How can this be justified?
2. It is on the road between Stavrodromi and Koumani.
3. It must be on or very close to the side of the road because it was discovered during road-building.
In addition to these vague criteria there are two photographs that show the area around Troupes. These are from Syriopoulos' article.
The first shows the Ladon river valley taken from ... somewhere.
Here I have labelled the gorge of the Ladon R. (tributary of the Alpheios). Also I have indicated the facing ridge on the S which is Dariza. The modern town of Dhimitra cannot really be seen but it's somewhere over the labelled ridge.
In the next picture I reproduce that view in Google Earth:
Being able to reproduce this view leads me to say that the photograph in Syriopoulos was taken from approximately37.786022° N, 21.947296° E. In this picture the red line is the road described in Syriopoulos' footnote 1. The intermittent blue line is the position of the Ladon river itself.
Syriopoulos labels this picture (a) as 'Troupes (or Damari) from north-east.'
But it isn't.
The photo labels in his article have come adrift. This caption which says 'Troupes' is actually meant for photograph (c) which is here:
This is the original. Here is a labelled version of it:
Here we're looking roughly SW down the Ladon river valley in the direction of Dhimitra which we cannot see. The main highway actually winds around the site of Troupes. If we could figure out from where this picture was taken we would know where Troupes is located. Perhaps it's possible to recreate this view in Google Earth?
After a great deal of huffing and puffing I was able to do exactly that.Here it is:
Not too convincing? That's what I mean when I say that photographs can stutter. O.k., let's zoom in on the ridge in the LC:
Now we have a photo almost identical to Syriopoulos' photo which
was taken from about37.790800° N, 21.932980° E. I suspect that Syriopoulos' original was taken with a moderate telephoto, perhaps 135 mm. focal length.
And there it all is. That wooded plateau feature in the center is Troupes. In Syriopoulos' original there are many limestone outcrops visible and those have nearly disappeared in the overgrowth some 45 years later. But when we look at this ridge from above those limestone features are still plainly visible:
I have drawn yellow arrows that indicate extruding features. Even though this east side of the ridge is greatly overgrown compared to when Syriopoulos' picture was taken its essential rocky nature is unchanged.
Here's another photo of the site from above:
Here's Syriopoulos' photo of it:
And this is as close as I can get in Google Earth Street View:
I think that Syriopoulos's photo was taken by following the branching road to the left (NW) and photographing the hill by facing more towards the NE.
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In Howell  p. 98, "During the construction of the public highway near the village of Dhimitra, a cutting was made through a prehistoric settlement."
In Simpson  88, 'D 19 Dhimitra: Troupes', "The small hill called Troupes lies about 2 k. northeast of Dhimitra, on the south slopes of Mt. Aphrodision, above the Ladon river valley. During road construction a cutting was dug through a prehistoric settlement here, and Syriopoulos ... collected a large quantity of sherds from it, mainly from the eastern slope. Most of this was Middle Helladic coarse ware, but a few sherds were Mycenaean of provincial type ... the LH IIIC claimed is not certain ..."
In Simpson and Dickinson  83, 'B 33 Dhimitra: Troupes': "The small hill called Troupes is c. 2 km. NE of Dhimitra, on the S slopes of Mt. Aphrodision. During road construction a cutting was made through the prehistoric settlement here and many sherds were collected, ... Most of this was MH coarse ware and provincial LH. ..."
In Parker  217: "Finally, near the village of Dhimitra (62) in the northwestern region of Arkadia, a substantial settlement dating from the Neolithic to the LBA was discovered when the current road was built (Syriopoulos 1973)."