Macroscytus arnhemicus J.A. LIS

Macroscytus arnhemicus J.A. LIS

(Figs 38­44)

Macroscytus arnhemicus J.A. LIS, 1999a: 463 .

DESCRIPTION

Body 7.23­8.17 mm in length, 3.83­4.32 mm in width, from dark castaneous to almost black.

Head with dorsal surface bearing only tiny and hardly visible punctures; clypeus subapically without a pair of setigerous punctures, each paraclypeus submarginally with 3­4 (very rarely with 2) setigerous punctures bearing long hair­like setae (Fig. 39); ocular index 2.23­2.40; interocellar index 6.7­10.8; length of antennal segments (in mm): 0.30­0.38: 0.42­0.51: 0.41­0.50: 0.57­ 0.63: 0.65­0.72.

Puncturation of pronotal disc weak; transverse discal impression behind calli absent or very shallow; lateral margins of pronotum with 5­7 submarginal setigerous punctures bearing long hair­like setae (Fig. 38). Anterior convexity of propleuron impunctate, sometimes with a few small punctures, posterior convexity weakly punctate with large punctures, propleural depression densely and coarsely punctate.

Scutellum with coarse large punctures.

Mesocorial disc almost evenly punctate; exocorium densely punctate; costa very narrow, entirely separated from exocorium, bearing 1­2 setigerous punctures (Fig. 38).

Male and female hind femur with a row of small tubercles on its dorsal margin, subapical teeth very small, almost indistinct (Fig. 40); male hind tibia with small denticles (Fig. 40), female hind tibia simple.

Abdominal sterna more or less polished, almost totally impunctate except for a row of punctures close to each segmental suture, and a few punctures posterior to spiracles and trichobothria; female specimens sometimes with distinct wrinkles laterally to spiracles.

Male genitalia as in Figs 41­44.

TYPE DATA

Holotype male: Australia, Northern Territory, Arnhem Hwy at South Alligator R. ( QMB) .

MATERIAL EXAMINED

Holotype, and 27 paratypes: Australia: Northern Territory, Sth. Alligator Inn , 10 paratypes ( QMB, UO) ; Northern Territory, South Alligator R. , 5 paratypes ( NTM, UO) ; Northern Territory, 12km NNW of Mt. Cahill , 1 paratype ( NTM) ; Northern Territory, Limestone Gorge , 2 paratypes ( NTM) ; Northern Territory, Nourlangie Creek , 1 paratype ( NTM) ; Northern Territory, Darwin, East Pl. Res. , 1 paratype ( NTM) ; Queensland, Moreton Is., Tertiary Dune Nr Blue Lagoon , 1 paratype ( QMB) ; Queensland, Taroom District , 4 paratypes ( QMB, UO) ; Queensland, Rocky Knob, 10km SE of Toowoomba , 1 paratype ( QMB) ; Queensland, South Percy Is. , 1 paratype ( QMB) .

DISTRIBUTION

Australia.