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