Batakomacrus

Key to Batakomacrus View in CoL View at ENA species (male of B. noyesi unknown)

1 Face with large yellow markings on vertical orbits, opposite ocelli; male with inner orbits (and face) entirely yellow............................................................................................................................................. B. flaviceps (Gravenhorst)

- Face lacking dorsal yellow marking, male of B. caudatus with orbits dark, although face is yellow ......................... 2

2 Female: 2nd tergite shiny, with faint coriaceous, or sometimes distinctly pustulate, sculpture, 1st thyridia inconspicuous, narrow, 2nd thyridiae faint, not raised (fig. 24); 3rd tergite onwards with pronounced, rectangular posterior emargination (fig. 9) ...................................................................................................................... B. caudatus (Holmgren)

- Female: 2nd tergite dull, with conspicuous coriaceous/pustulate sculpture, 1st thyridiae conspicuous, rounded rectangular, 2nd thyridiae raised (fig. 25); 3rd and 4th tergites with faint posterior emargination (fig. 26).... B. noyesi sp. nov.