Psilota azurea Thompson and Young,

Young, Andrew D., Skevington, Jeffrey H. & Steenis, Wouter Van, 2020, Revision of the Psilota Meigen, 1822 flower flies (Diptera: Syrphidae) of Australia, Zootaxa 4737 (1), pp. 1-127: 32-34

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Psilota azurea Thompson and Young

sp. nov.

Psilota azurea Thompson and Young  sp. nov.

(Species plate: Fig. 11View FIGURE 11; Genitalia: Fig. 37View FIGURE 37 E–F; Map: Fig. 52BView FIGURE 52)

Psilota  sp. 88-39 Thompson, unpublished

Diagnosis: Antenna entirely bright orange, thorax and abdomen almost entirely black pilose. Thorax dark metallic and dark blue, abdomen metallic indigo on tergites 3 and 4. Hind leg simple. Halter and calypter dark. Body length: 8.4–11.0 mm.

Description: MALE: Head: Face black, with a metallic green sheen. Face sparsely yellow pollinose. Face with yellow pile, frons and vertex with black pile. Antenna entirely bright orange. Eye densely pilose, pile entirely yellow. Thorax: Thorax dark metallic blue. Hind femur unmodified, with only a few weak, black setulae apicoventrally. Femora mostly dark, with fore and mid femora obscurely dull orange to brown on apical half. Thorax entirely black pilose. Wing faintly brown tinted, entirely microtrichose. Halter dark brown. Calypter brown. Abdomen: Tergites 1 and 2 dark metallic blue, tergites 3 and 4 metallic indigo blue in most specimens. Tergites 2 and 3 entirely black pilose, tergite 4 mostly black pilose with some mixed white pilosity. All sternites dark metallic blue, white pilose. Genitalia: Epandrium compact, about as long as tall. Cercus approximately triangular. Outer lobe of surstylus inserted near top of inner lobe, smoothly curved downwards at its midpoint. Inner lobe of surstylus narrow, approximately 4.5 times as long as wide, swollen at base, somewhat abruptly constricted at two-thirds its total length, and abruptly swollen and rounded at apex, with the ventral margin curved downwards. Inner lobe of surstylus also with a medially projecting bulge at two-thirds its total length, and upper margin of the tip of the inner lobe curved medially. Phallapodeme with a small ventral tooth. Gonostylus not darkened.

FEMALE: Identical except for normal sexual dimorphism.

Etymology: The specific epithet azurea  derives from the Latin “azureus”, which means “a deep blue colour”. This is in reference to the distinctive indigo blue abdomen.

Specimens examined: HOLOTYPE: AUSTRALIA: New South Wales: Bald Rock N.P.; -28.860783 152.055686; on Leptospermum minutifolium  blossom, 6-7.XI.1984; D.K. Yeates; UQIC_ Reg 94741; (1♂, QM)GoogleMaps  . PARATYPES: Australian Capital Territory: Black Mtn. , -35.274519 149.096908, 25.xi.1959, J.F.B. Common, light trap, CNCGoogleMaps  _ Diptera  255027 (1♂, ANIC); Blundell’s , -35.292886 149.141800, 24.x.1950, Paramonov, USNMGoogleMaps  _ ENT_ 00249841 (1♂, USNM)  ; New South Wales: 20 miles South of Milton , -35.319178 150.439158, 30.ix.1952, S.J. Paramonov, ANIC29034933View Materials (1♀, ANIC)GoogleMaps  ; 4 miles North of Bateman’s Bay , -35.658458 150.177744, 14.x.1952, S.J. Paramonov, ANIC29034934View Materials (1♀, ANIC)GoogleMaps  ; 6.5 miles North of Bateman’s Bay , -35.658458 150.177744, 14.x.1959, Z. Liepa, ANIC29034974View Materials (1♂, ANIC)GoogleMaps  ; Grondera Ridge, Royal National Park, -34.114342 151.046586, 18.xi.1978, G. Daniels, GDCBReg_19681 (1♂, GDCB)GoogleMaps  ; Nadgee Reserve , Merrika River Crossing , -37.306786 149.926247, 13-16.x.1986, E.A. Sugden, Jeff _ Skevington _ Specimen 43827 (1♂, QM)GoogleMaps  ; Woy Woy , -33.489839 151.319942, 22.ix.1923, Mackerras, ANIC29034973View Materials (1♂, ANIC)GoogleMaps  ; Queensland: Mount Moffatt National Park, West Branch campsite, -24.976000 148.010000, 760m, along flowing creek, 23-27.ix.2013, S. Wright, Malaise trap, CNC457413View Materials (1♀, QM)GoogleMaps  ; Stanthorpe , -28.657928 151.930344, 1924, 3.x.1924, 7.x.1928, Date is ambiguous reads ”3.10.24”, UQIC_ Reg 94803, UQIC_ Reg 94693, CNCGoogleMaps  _ Diptera  253728, ANIC29034975View Materials  (2♂♂, 3♀♀ QM, CNC, ANIC)  .

Discussion: Psilota azurea  sp. nov. has been collected on individuals of Leptospermum minutifolium  and at a light trap.


Queensland Museum


Canadian National Collection of Insects, Arachnids, and Nematodes


Australian National Insect Collection


Smithsonian Institution, National Museum of Natural History