In many birds the spaces between the metasternum and the posterior processes and again the spaces between this and the oblique process are filled up by proceeding ossification and either remain as notches, or as fenestrae, or they are completely abolished so that the breastbone is turned into one solid more or less oblong plate.
The metasternum is without the transverse linear impression that is found in most families of Adephaga.
B, Metasternum of prosoma.
Sternal elements of prosoma almost entirely absent, traces of a prosternum and metasternum alone remaining.
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