I just went to the source, p. 314, Robbins and Easterla, Birds of  

R & E do not state that Blue Grosbeak does not breed in Missouri.   
The statement about no breeding records is clearly limited in  
reference to one geographic/habitat area.

Under Summer, the following sentence appears:

  It is not known to breed in the Mississippi Lowlands (none have  
been recorded on the sole BBS route in that region; n = 16 years).

Edge Wade
Columbia, MO
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