Juriniopsis adusta

Tachinid Fly
Juriniopsis adusta

 

achinid Fly Juriniopsis adusta female, white face, red palpi on Mint. August 06, 2017, Leamington, Ontario.
Tachinid Fly Juriniopsis adusta female, white face, red palpi on Mint. August 06, 2017, Leamington, Ontario.

Identification:
Head: Face slightly shiny, whitish-gray on female, duller with more whitish pile on male. Female eyes wide apart, male’s closer but not touching. Whiskers (palpi) long, bright reddish-orange. Thick layer of yellowish-brown hair around entire back of head.
Antenna: Brownish-yellow, last segment lighter. 2nd joint very narrow. Joint 3 oblong, as long as 1 and 2 combined.

Tachinid Fly Juriniopsis adusta female, no crossed bristles on scutellum lower margin. Mint, August 06, 2017, Leamington, Ontario.
Tachinid Fly Juriniopsis adusta female, no crossed bristles on scutellum lower margin. Mint, August 06, 2017, Leamington, Ontario.

Thorax: Black. Segment 1 (scutum) base half covered with yellowish pile. Segment 2 (scutellum) has no bristles at tip of lower margin, but some erect bristles at each side.
Wings: Wings slightly tinted, base very dark and one small cross-wise spot at mid wing (cross vein r-m) dark. Calypteres usually dark brown.
Legs: Black with yellow toes and with the usual black bristles and hair. Female has wider front feet.
Abdomen: Shiny, deep bright reddish-brown (castaneous), with long bristles on lower half of abdomen sides. Many black bristles across lower edge of segment 2 and longer, thicker bristles across lower margin of segment 3.  Bristles shorter, covering last segment and tip.

Tachinid Fly Juriniopsis adusta female, rows of black bristles on abdomen segments lower margin. Mint, August 06, 2017, Leamington, Ontario.
Tachinid Fly Juriniopsis adusta female, rows of black bristles on abdomen segments lower margin. Mint, August 06, 2017, Leamington, Ontario.

Similar Species: There are two others similar in Ontario with a red abdomen.

Archytas metallicus has long crossed (decussate) bristles at centre tip of thorax segment 2 (scutellum). These bristles point straight down to abdomen; J. adusta has none pointing downward. Abdominal segment 2 has only 2 bristles; many bristles on J. adusta.

Pararchytas decisus face is more hairy and yellowish, same color as hair layer around back of head; long crossed bristles at centre tip of thorax segment 2 (scutellum); wings darker with last two cross-vein lines before tip darkened (dm-cu and r4+5M).

Size: 12 to 15 mm long.

Habitat: Forest edges.

Food: Adults feed on flower pollen and nectar.

Flight Time: July to August

Life Cycle: Larva are parasites of the Silver-spotted Skipper Epargyreus clarus and Tiger Moths Halysidota harrisii and H. tessellaris. Possibly Giant Leopard Moth Hypercompe scribonia. Larvae attack Hypercompe species in Florida.

Comments: Essex County – Point Pelee (1), Leamington (1), LaSalle (1 on BugGuide). Very rare, northern range extension.

For information on synonyms, references and type specimens see next page

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