Microrhagus (Adults), 1833

Otto, Robert L., 2015, Eucnemid larvae of the Nearctic region. Part V: Fifth instar larval descriptions for eight species of Microrhagus Dejean, 1833 (Coleoptera: Eucnemidae: Melasinae: Dirhagini), with descriptions of four new species and notes on their biology, Insecta Mundi 2015 (421), pp. 1-46 : 3-4

Key to the species of Nearctic Microrhagus (Adults)

1.

— Anterior lateral pronotal ridge elongate, longer than 1/3 the length of pronotum ( Otto 2013a, Fig. 1 ) .......................................................................................................................................... 2

Anterior lateral pronotal ridge short, shorter than 1/3 the length of pronotum ( Otto 2013a, Fig. 2 ) ................................................................................................................................................. 3 2.

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Posterior lateral pronotal ridge short, shorter than 1/2 the length of pronotum ( Muona 2000, Fig. 51 ) (pectinatus species group) ................................................... M. pectinatus LeConte

Posterior lateral pronotal ridge elongate, longer than 1/2 the length of pronotum ( Muona 2000, Fig. 54 ) (subsinuatus species group) ................................................ M. subinuatus LeConte

3.

— Posterior lateral pronotal ridge short, up to 1/3 the length of pronotum ( Muona 2000, Fig. 62 ) (audax species group) ................................................................................................................ 4

Posterior lateral pronotal ridge elongate, up to 3/4 the length of pronotum ( Muona 2000, Fig. 58 ) ............................................................................................................................................... 5 4.

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Pronotum finely punctate, shiny; lateral side of hind angles narrowly rounded apically; scutellum not elevated; anterior lateral pronotal ridge sinuous, ventrally bent ( Fig. 3 ) M. audax Horn

Pronotum coarsely punctate to rugose, dullish; lateral side of hind angles broadly rounded apically; scutellum slightly elevated; anterior lateral pronotal ridge directed posteriorly ( Fig. 29 ) ....................................................................................................... M. opacus new species

5.

— Pronotal hind angles small ( Fig. 4 ) (brunneus species group) ................................................... 6 Pronotal hind angles moderately sized ( Fig. 5 ) ........................................................................... 7 6.

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Figures

Figures 1–2. Rearing method. 1) Storage bag with rotten wood and data. 2) Examined rotten wood.

Figures 48–51. Microrhagus carinicollis Otto. 48) Holotype, dorsal view. 49) Holotype, lateral view. 50) Holotype, ventral view. 51) Aedeagus of paratype. Scale line = 0.5 mm.

Figures 52–56. Microrhagus carinicollis, fifth instar. 52) Dorsal habitus of paratype. 53) Head, dorsal view of paratype. 54) Head and thoracic region, dorsal view of paratype. 55) Head and thoracic region, ventral view of paratype. 56) Abdominal segments VII–IX, ventral view of paratype. Scale line = 2.0 mm.

Figures 62–65. Microrhagus lecontei, fifth instar. 62) Head, dorsal view of paratype. 63) Head and thoracic region, dorsal view of paratype. 64) Head and thoracic region, ventral view of paratype. 65) Abdominal segments VII–IX, ventral view of paratype.

Figures 57–60. Microrhagus lecontei Otto. 57) Holotype, dorsal view. 58) Holotype, lateral view. 59) Holotype, ventral view. 60) Aedeagus of paratype. Scale line = 2.0 mm.

Figures 3–8. Nearctic Microrhagus. 3) Microrhagus audax, pronotum, lateral side. 4) Microrhagus carinicollis, pronotum, pronotal hind angles circled. 5) Microrhagus brunneus, pronotum, pronotal hind angles circled. 6) Microrhagus carinicollis, vertex. 7) Microrhagus lecontei, antennomeres 3–6. 8) Microrhagus triangularis, antennomeres 3–6.

Figures 26–29. Microrhagus audax, fifth instar. 26) Head, dorsal view. 27) Head and thoracic region, dorsal view. 28) Head and thoracic region, ventral view. 29) Abdominal segments VII–IX, ventral view.