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Photo#609632
Pelastoneurus - female

Pelastoneurus - Female
Rotonda West, Charlotte County, Florida, USA
June 5, 2011
Size: 3 mm
Collected at UV light.

Keys to Tachytrechus. I think it may be T. protervus Melander based on the antennae being dark yellow/orange except for tip of last segment which is darkened and the last antennal segment being relatively long.

Images of this individual: tag all
Pelastoneurus - female Pelastoneurus - female Pelastoneurus - female Pelastoneurus - female

possibly P. lamellatus
if Van Duzee's key is to be trusted, though it seems very subjective @ couplet 12; but Robinson 1964 states females are not reliably told apart

Moved
Moved from Longlegged Flies.

Moved
Moved from Tachytrechus.

Color is off
If the color is accurate this doesn't match any species of Tachytrechus from Florida. T. protervus has darker legs, first segment of antenna dark on top, and possibly has the bend in M in a different place. See Melander (1900), Greene (1922)

 
Color is accurate
So I probably have the wrong genus... Any ideas?

Characters used to key (MoND): vertex of head not excavated; C continuous to M; R 4+5 and M converging; hind femur with preapical bristle on anterodorsal surface (broken off on side visible here); scape with setae above; arista dorsal, not apical; acrostichal setae present; no dorsal bristle on hind basitarsus.

From there I was at the Tachytrechus couplet, and the fly seemed to have a projecting face. If my error is at this couplet, then it would key on to Paraclius.

 
Call for help
This would be a good one for diptera.info (with a note that the color is wrong for American Tachyrtrechus). The answer might be, the Paraclius-Pelastoneurus-Tachytrechus complex is a mess. If so you could dump it in the Paraclius or Pelastoneurus page,(1) adding the third genus name.

 
I'll post it over there
thks John

 
ID
Marc Pollet on diptera.info says the bulging face is characteristic of Pelastoneurus. I'll try and see if I can key it in Robinson. (Looking at the key, it relies a lot on male characters, so probably need to find a male)

 
Bleached?
I was wondering if it might have faded in alcohol, but I don't see even a trace of color pattern.

 
Legs or thorax?
My experience is that these hold their colors well.

There is a pattern on the thorax (two median purple stripes and metallic on scutellum as well) and a pair of whitish spots visible from above laterally (barely visible in the top view). There are also lateral white spots on a couple of the abdominal segments, only visible when looking from a rear angle.

 
Paraclius
If Paraclius, then it keys to P. floridensis (Robinson 1964). Although slightly different in coloration than described, it has the single ventral bristle on the middle tibiae. The color difference may be a sex difference, as Robinson apparently only had one female specimen.

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