Bathrus

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Bathrus Dallas, 1851

Photo © Emma Betts, Australian Museum

Type species:

Bathrus variegatus Dallas, 1851 by monotypy.

Number of Australian species:

One.

Extralimital Distribution:

No.

Australian Distribution:

Temperate, subtropical and tropical regions; New South Wales and Queensland.

Biology:

Unknown.

Host(s):

Unknown.

Diagnosis:

Colour

Dorsally pale brown with dark brown punctations, bands or patches of metallic green on head, pronotum, scutellum and connexiva. Ventrally pale brown with patches of metallic green on metepisternum and at base of fore coxae. Legs and antennae mottled pale and medium brown.

Texture

Dorsally densely punctate; ventrally with few punctations, concentrated anteriorly.

Vestiture

Glabrous.

Structure

Body - Elongate-ovoid, dorsally convex. Length 11.0 mm - 15.0 mm; width 7.0 mm - 10.0 mm.

Head - Subtriangular, moderately dorsoventrally orientated, as long or longer than pronotum; jugae shorter or equal to clypeus, pointed apically, laterally carinate; antennifer processes absent; four antennal segments, first segment shorter than distance between eyes, inserted into head below mid-height but above ventral margin of eyes; bucculae elongate (posteriorly beyond antennifers); vertex flattened to slightly convex; labium extending onto abdomen, to third or fourth sterna, first labial segment longer than bucculae; eyes not stylate, directed laterally.

Pronotum - Calli present; anterior lobe surface flat; humeral angles angulate, not greatly expanded; lateral margins explanate; anterolateral margins crenulate and straight; posterolateral margins concave; posterior margin sinuate.

Scutellum - Triangular, apex narrowly rounded; Y-shaped raised area present whole, or as a raised bump anteriorly; lateral calli present as shallow, dark pits; medial callus absent.

Thoracic sterna - Prosternum shallowly sulcate, without margin processes; mesosternum with low raised keel; metasternum flat, not sulcate.

External efferent system - Evaporative scent gland covering half to most of the metepisternum; peritreme marginally elongated, apically pointed.

Hemelytra - Macropterous, longer than abdomen; membrane veins linear and subparallel.

Legs - fore tibia sulcate.

Abdomen - Connexiva visible dorsally; laterotergites armed with very short blunt posterolaterally directed spines.