Microrhagus, Dejean, 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 : 4

Key to the known larvae of Nearctic Microrhagus

1.

— Each side of head capsule with five lateral projections ( Fig. 16 ); spiracular collar caudally pointed ( Fig. 9 ) ........................................................................................................................................ 2

Each side of head capsule with four lateral projections ( Fig. 26 ); spiracular collar rounded ( Fig. 10 ) ............................................................................................................................................... 3 2.

—

Microtrichial patches narrowed; prothoracic scleromes larger, triangular ( Fig. 15, 17 ) (pectinatus species group) ..................................................................................... M. pectinatus LeConte

Microtrichial patches larger; prothoracic scleromes smaller ( Fig. 20, 22 ) (subsinuatus species group) ............................................................................................... M. subsinuatus LeConte

3.

— Areoles placed near base of each abdominal segment ( Fig. 11 ) (brunneus species group) ....... 4 Areoles placed near center of each abdominal segment ( Fig. 12 ) ............................................... 5 4.

—

Areoles elongate, transverse; prothoracic microtrichial patch sub-triangular ( Fig. 38 , 40 ) ....... ............................................................................................... M. breviangularis new species

Areoles oval, transverse; prothoracic microtrichial patch rectangular ( Fig. 43 , 45 ) ................... ....................................................................................................................... M. brunneus Otto

5.

— Areoles placed approximate to microtrichial patches ( Fig. 13 ) .................................................. 6 Areoles placed distally from microtrichial patches ( Fig. 14 ) (audax species group) ...................

Figures

Figure 38. Microrhagus breviangularis, fifth instar, dorsal habitus of paratype.

Figure 43. Microrhagus brunneus, fifth instar, dorsal habitus. Scale line = 2.0 mm.

Figures 15–19. Microrhagus pectinatus, fifth instar. 15) Dorsal habitus. 16) Head, dorsal view. 17) Head and thoracic region, dorsal view. 18) Head and thoracic region, ventral view. 19) Abdominal segments VII–IX, ventral view.

Figures 9–14. Nearctic Microrhagus. 9) Microrhagus pectinatus, spiracular collar on abdominal segments 1–3, lateral view. 10) Microrhagus breviangularis, spiracular collar on abdominal segments 1–3, lateral view. 11) Microrhagus brunneus, abdominal segments IV–VI, dorsal view. 12) Microrhagus carinicollis, abdominal segments IV–VI, dorsal view. 13) Microrhagus triangularis, abdominal segments IV–VI, dorsal view. 14) Microrhagus audax, abdominal segments IV–VI, dorsal view.

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.

Figures 20–24. Microrhagus subsinuatus, fifth instar. 20) Dorsal habitus. 21) Head, dorsal view. 22) Head and thoracic region, dorsal view. 23) Head and thoracic region, ventral view. 24) Abdominal segments VII-IX, ventral view.

Figures 39–42. Microrhagus breviangularis, fifth instar. 39) Head, dorsal view of paratype. 40) Head and thoracic region, dorsal view of paratype. 41) Head and thoracic region, ventral view of paratype. 42) Abdominal segments VII–IX, ventral view of paratype.

Figures 44–47. Microrhagus brunneus, fifth instar. 44) Head, dorsal view. 45) Head and thoracic region, dorsal view. 46) Head and thoracic region, ventral view. 47) Abdominal segments VII–IX, ventral view.