309a (308b). First dorsal plate
greatly enlarged, convex, non-collapsing (Figs.A-B), covering
more than 1/3rd (often much more, but only 1/4th in
male Austrosystasis) of
abdomen;
antennal sockets usually close to
each other; often not metallic....................…........…................ 310
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A B
309b. First dorsal plate never bell-shaped, not so convex and large;
if covering over 1/3rd of
abdomen then either itself collapsing from base or
whole abdomen dorsally caving in;
antennal sockets usually rather wide
apart...................................................…...................................
314