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unknown - Physoconops brachyrhynchus

unknown - Physoconops brachyrhynchus
Shreveport, Highland area, Caddo Parish, Louisiana, USA
July 1, 2014

How is this different from [t
How is this different from ? Camras 1955 seems to key them separately based on the extent of frontal black in step 26.

Couplet 26 of Camras(1955) indeed relevant
The photo here and the one you thumbnailed in your comment are quite similar!

The one here has a clearer view of the entire frons, and exhibits the characteristic "medially dark, laterally pale" pattern of P. brachyrhynchus...whereas in the image you referred to in the thumbnail has a more tangential view of the frons, which I earlier mistook as being "entirely black", as in P. bulbirostris, per couplet 26 of Camras(1955).

However after scrutinizing the thumbnailed post further, it appears the frons there is not "entirely black"...but has "lateral portions pale", and is better placed as P. brachyrhynchus rather than P. bulbirostris. (P. excisus is eliminated here, since there is no complete post-vertical pollinose stripe.)

Recently, while working on identifying various iNat posts, I noticed a few potential errors in some of my earlier placements of various posts to P. bulbirostris (e.g. the one you thumbnailed above, Gordon's post here, and a few more). A confident determination of species is more difficult when there's only a dorsal image to work a profile view provides further critical characters (e.g. cheek color, extent of pleural stripe) in the event variation of the frons color/pattern might be an issue.

I had wanted to add some ID details to the info pages for the relevant species (i.e. bulbirostris, excisus , and brachyrhychus) before I made the corrections/moves...but haven't gotten to it yet. (Part of the delay results from my attempts to translate and mentally process descriptions of some of these species given in German by Loew and Kröber...but I hope to add remarks on distinguishing characters to those info pages soon.)

Also, note the relatively short proboscis visible here
"Proboscis short" is a useful character to keep in mind for P.'s where the specific epithet comes from (brachy- = short, and rhynchus = beak).

Moved from Conopinae.

Coloration of frons; antennal proportions; pattern of wing infuscation; white pollinose humeral dash-like spots; and lack of any prominent pollinose arcs along the hind edge of the head...all these indicate P. brachyrhynchus here.

for the ID and information.

Moved for expert attention
Moved from ID Request.

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