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1. Abdomen with terga 3-8 reddish-brown, contrasting
with predominantly black head and thorax (a). Large, body length
usually above 1 cm, at least in females … 2
- Abdomen brown to black, no distinct colour
difference with head and thorax (A). Smaller, body length in either
sex usually not above 1 cm … 3
2. White markings on frons elongate, extending above
half the height of inner margins of eyes, not extending into malar
space (a). Frons rugose, interspaces between pits carinate (b). Area
between eye and postocular carina with confluent pits (c) …
Orussus abietinus
- White markings on frons comprise irregular blotches
positioned on lower frons, extending less than half the height of
the inner margins of the eyes (A), in male extending laterally onto
the malar space. Frons densely pitted, pits with distinct
interspaces (B). Area between eye and postocular carina with
separated pits (C) …
Orussus smithi
3. Frons ventrally with two adjacent white markings
(a), antenomeres 4-6 extensively white (a). Femora and tibiae black
with white markings (b) …
Orussus unicolor
- Without white markings on frons or antennae (A).
White markings absent on legs (C), or if present on both the femora and
tibiae then either the legs or the mesosoma are reddish-brown (B) …
4
4. Head with ocellar corona wide (a, b), distance
between median ocellus and lateral most coronal tooth more than 2 x
diameter of median ocellus (red bars) (a, b), dorsal most coronal
teeth situated dorsal to lateral ocellus (a, b); posterior margin of
mesoscutellum evenly rounded, semicircular in outline (c) … 5
- Ocellar corona narrow, distance between median
ocellus and lateral most coronal tooth less than 2 x the diameter of
former (red bars) (A), dorsal most coronal tooth situated at level
with lateral ocellus; mesoscutellum triangular, angled posteriorly
(B) … 7
5. Mesoscutum with weakly developed longitudinal
carina medially (a); mesoscutellum with hindmargin not reaching
anterior margin of metanotum, mesopostnotum continuous posteriorly
(b); hind tibia with white spot proximally (male unknown) (c) …
Orussus spinifer
- Mesoscutum with distinct raised tubercle or carina
medially (A); mesoscutellum with hindmargin reaching anterior margin
of metanotum, subdividing mesopostnotum (B); hind tibia without
white spot proximally (C) … 6
6. Mesoscutellum flat
(a) …
Orussus schoutedeni
- Mesoscutellum with raised tubercle (female unknown)
(A) …
Orussus scutator
7.
Hind tibia with 14–15 dorsal pegs (a) … 8
- Hind tibia with 5–11 dorsal pegs (A) … 9
8. Antennomeres 1–2 reddish-brown, distinctly lighter coloured than remaining antennomeres (except antennomere 10)
(male unknown)
(a, b)
…
Orussus afer
-
Antennomeres 1–2 dark brown, same colour as remaining antennomeres
(male unknown)
(A, B) …
Orussus tessmanni
9. Mesoscutellum densely sculptured (a).
Tibiae on all legs extensively reddish-brown
(female unknown) (b) …
Orussus areolatus
- Mesoscutellum sparsely punctured, with broad
shining interspaces (A). Tibiae on all legs predominantly
blackish-brown, sometimes with yellow patches (B) … 10
10. Both sexes with thorax brown or black, not
differently coloured from other body parts (a, b) …
Orussus moroi
- Female with pronotum,
mesonotum, and anterodorsal part of mesopleuron reddish-brown,
contrasting with colour of other body parts
(male unknown)
(A, B)
…
Orussus taorminensis
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