Sentence:  ... I have received here also one of the parent birds, and in this instance I have been again surprised to learn that it is the <WSD>Loggerhead</WSD>, and not "borealis" or "excubitoroides", that is the species referred to. ... So that we have in all ten well-authenticated instances of the <WSD>Loggerhead</WSD> breeding in the very heart of two of the most northerly of the New England States. 
Meaning of the word marked with <WSD> tags:  The loggerhead shrike ("Lanius ludovicianus"), a bird endemic to North America.