Similar to Belonogaster dubia, including the yellow face markings of males. Identified based on the following:
Ferruginous legs and gaster, tergites 2+ darkened. Gastral petiole relative short and stout, somewhat widened at apex, gaster posteriorly with close pale tomentum. Wings not black with purple reflections, ruling out race B. j. juncea. Clypeus acute below, not rounded as in male B. dubia. Mesoscutum, mesopleuron and humeri finely granulate dull with close silvery tomentum.
Face of males: Gena narrow. Yellow dorsal streak on mandibles, sides of clypeus and inner orbits. Yellow spot between antennal sockets reminds of the larger B. dubia male. Male antennal segments 9-11 have bumps on inner surface, segment 12 uniformly curved and not dilated at tip as in B. dubia. Yellow anterior streak on scape however not visible, and yellow spots on gaster limited to northern populations, absent here.