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Tach - Chaetogaedia

Tach - Chaetogaedia
Rotonda West, Charlotte County, Florida, USA
June 5, 2011
Size: 12 mm
Collected at UV light.

Images of this individual: tag all
Tach - Chaetogaedia Tach - Chaetogaedia Tach - Chaetogaedia Tach - Chaetogaedia Tach - Chaetogaedia

Moved from Goniini.

Moved from Tachinidae.

Tachinidae: Goniinae
Tachinidae: Goniinae

Thanks Norm!

Keying it out
I easily get to couplet 67 of the Tachinidae chapter of Manual of Nearctic Diptera (ocellar bristles proclinate; eyes bare; gena fairly wide; M ending separately from R 4+5). From there its how the bristles are arranged on the hind tibiae.

One option leads to Lespesia (4 katepisternal bristles, abdomen with pattern of pruinescence).

The other leads to Chaetogaedia (parafacial widely setose, of varying lengths; extensive bristles on facial ridge).

(Notopleuron has an extra bristle as in Fig 163)

A clue
Lespesia has "apical scutellar bristles erect and cruciate" (Sabrosky, 1980), while the "probably Chaetogaedia" in the guide does not. Also, Goniini females are supposed to have differently shaped abdomens than Eryciini but I don't know how consistent that is.

Quoting Sabrosky:

Species of Lespesia are characterized by having the head much higher than long, eyes bare or sparsely and minutely pubescent (except in halisidotae and parviteres), parafacials bare, well-developed ocellar bristles proclinate and divergent, 2 pairs of reclinate fronto-orbital bristles in both sexes (one pair in laniiferae, marginalis, and rubra, but in some or all of these that may be a chaetotactic variation), facial ridges bristled usually to or nearly to the level of the end of the frontal row of bristles, 4 pairs of postsutural dorsocentral bristles, long and strong prealar bristle, 4 sternopleural bristles, apical scutellar bristles erect and cruciate, no median discal bristles on the intermediate segments (terga 3 and 4) of the abdomen, tergum 5 covered with erect hairs and bristles, fore tibia with 2 posterior bristles, mid tibia with one long and strong anterodorsal bristle midway (sometimes a much shorter bristle above it), hind tibia ciliate anterodorsally, and spiracular plates with serpentine slits.

thanks John
Finally got around to looking at this again. Since parafacials are definitely setose, it should not be Lespesia. It matches up nicely with Chaetogaedia. Thanks for the help as always!

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