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TaxonomyBrowseInfoImagesLinksBooksData
Photo#1007794
Syrphid Fly - Toxomerus jussiaeae

Syrphid Fly - Toxomerus jussiaeae
Mississippi, USA
August 1, 2014

Images of this individual: tag all
Syrphid Fly - Toxomerus jussiaeae Syrphid Fly - Toxomerus jussiaeae

Moved

Pretty sure this is actually
Pretty sure this is actually Toxomerus jussiaeae - compare Ximo's images here:




Of described Toxomerus in the area, this does not match T. boscii/T. geminatus/T. marginatus/T. politus but is nearly identical to several other previously unidentified BugGuide Toxomerus from more northerly areas. T. jussiaeae is found generally in the Midwest-Southeast area (Illinois, Tennessee, Missouri, Mississippi, Louisiana, North Carolina, from diptera.org).

The only other candidate, T. corbis, is poorly described by Walker 1852:

"Head bright pale yellow; hind part and underside black; tinged with hoary, clothed with white hairs; eyes bright red; facets on the crown larger than those elsewhere; mouth ferruginous; feelers bright tawny; sixth joint black, tawny at the base; chest and breast brassy-green; chest clothed with tawny hairs, adorned with four indistinct pale ferruginous stripes which unite in front of the scutcheon; sides and scutcheon tawny; breast tinged with hoary, adorned on each side with a short yellow band and with two yellow spots; abdomen nearly elliptical, longer and a little broader than the chest, ferruginous, tawny towards the base where it has two black bands, pitchy towards the tip; legs tawny; feet darker; a pale brown band near the tip of each hind-thigh, and another near the base of each hind-shank; wings nearly colourless; wing-ribs tawny; veins black, tawny at the base; poisers tawny."

A set of photographs of the paralectotype is here. Harvard's paralectotype appears to have a quite narrow cinerous band in the thorax, black stripes on front don't extend past antennae, unfortunately hindlegs are lost and their abdominal shot appears to be the ventral, rather than dorsal, view. This BugGuide fly also lacks the brown bands described on the hind femur and tibia.

but this much more matches Vige's description of T. jussiaeae, notably "Face with a black stripe descending from the front around each antenna and tapering on either side of the tubercule to its lower level, infuscate, especially above the oral margins and bordering the eyes" and "a silvery white spot on the sternopleura just below the yellow of the mesopleura, a similar but less distinct silvery spot above the front coxa descending from the front around each antenna and tapering on either side of the tubercule to its lower level, infuscate, especially above the oral margins and bordering the eyes" and "Thorax greenish-rusty above, median cinerous line distinct throughout, lateral cinerous lines less conspicuous" and in particular the abdomen: "predominantly reddish-yellow; first segment black above, edges narrowly yellow; second segment black, a light median fascia broadest at the edges and interrupted; third and fourth segments each with a black fascia apically, semi-interrupted, and a median, black, geminate vitta (this may be reduced to mere spots); on the fifth and sixth segments, each of which has a distinct black fascia apically and usually a single, median, black vitta."

So between the species descriptions and Ximo's pictures, I'm pretty happy to call this T. jussiaeae.

 
You made some great points an
You made some great points and you might have solved another Toxomerus mystery! Thanks!

 
Thanks! Glad to know I wasn'
Thanks! Glad to know I wasn't completely off base; if you want to send these to Ximo or whomever, I'm happy to be corrected as necessary :^)

Moved
Moved from Toxomerus.

Moved for expert attention
Moved from ID Request.

Not sure about this one...

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