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I am attempting to add an "illustrator" editor type to my reference with little success. I have looked at the answers at:

How to identify Illustrator in bibtex?

Create new editorial role "organizer" in biblatex

I can make my MWE work until I add style=APA to biblatex. At that point the editortype is rendered as typeillustrator. Using other predefined editor types produced similar results.

How can I make the APA bibliography style produce "illustrator" instead of "typeillustrator"?

documentclass{article}

usepackage[style=apa, backend=biber]{biblatex}



usepackage{filecontents}



begin{filecontents}{mwe.bib}

@Book{jones1886illustrations,

    author     = {Jones, Howard},

    title      = {Illustrations of the nests and eggs of birds of Ohio with text},

    year       = {1886},

    editor     = {Jones, N. E.},

    editortype = {illustrator},

    location   = {Circleville, OH},

}

end{filecontents}



addbibresource{mwe.bib}



NewBibliographyString{illustrator}

NewBibliographyString{illustrators}

NewBibliographyString{byillustrator}

NewBibliographyString{cbyillustrator}



DefineBibliographyStrings{english}{%

    illustrator    = {illustrator},

    illustrators   = {illustrators},

    byillustrator  = {illustrated by},

    cbyillustrator = {illustradddot},

}





begin{document}

nocite{*}

printbibliography

end{document}

Results:

The bibstrings that biblatex-apa uses for editortype are called type<editortype> and type<editortype>s, so you have to define those as well.

documentclass{article}

usepackage[style=apa, backend=biber]{biblatex}



NewBibliographyString{illustrator}

NewBibliographyString{illustrators}

NewBibliographyString{byillustrator}

NewBibliographyString{cbyillustrator}

NewBibliographyString{typeillustrator}

NewBibliographyString{typeillustrators}



DefineBibliographyStrings{english}{%

  illustrator      = {illustrator},

  illustrators     = {illustrators},

  typeillustrator  = {illustrator},

  typeillustrators = {illustrators},

  byillustrator    = {illustrated by},

  cbyillustrator   = {illustradddot},

}



usepackage{filecontents}

begin{filecontents}{jobname.bib}

@book{jones1886illustrations,

  author     = {Jones, Howard},

  title      = {Illustrations of the nests and eggs of birds of {Ohio} with text},

  year       = {1886},

  editor     = {Jones, N. E.},

  editortype = {illustrator},

  location   = {Circleville, OH},

}

end{filecontents}

addbibresource{jobname.bib}



begin{document}

nocite{*}

printbibliography

end{document}

It is a bit unfortunate that biblatex-apa uses different bibstrings than the standard styles, but given the predefined terms I guess that was done to avoid name clashes with other standard bibstrings (there are typevolume and typeseries for volume and series editors, respectively; these can't be just volume or series because those names are already taken).

It may be a nicer solution to tell biblatex-apa to try the standard <editorype> bibstring when type<editortype> is undefined.

With

renewbibmacro*{apaeditorstrg}[1]{%

  iffieldundef{#1type}

    {ifthenelse{value{#1}>1ORifandothers{#1}}

       {bibcpstring{editors}}

       {bibcpstring{editor}}}

    {ifthenelse{value{#1}>1ORifandothers{#1}}

       {ifbibstring{typethefield{#1type}s}

          {bibcpstring{typethefield{#1type}s}}

          {bibcpstring{thefield{#1type}s}}}

       {ifbibstring{typethefield{#1type}}

          {bibcpstring{typethefield{#1type}}}

          {bibcpstring{thefield{#1type}}}}}}

it should not be necessary to define typeillustrator and typeillustrators.

The string cbyillustrator is not needed in the MWE since it is only used by biblatex-chicago as pointed out in How to identify Illustrator in bibtex?.

Finally, note the curly braces around Ohio to stop the sentence casing applied by biblatex-apa from wrongly converting the proper name Ohio to lower case. Cf. BibTeX loses capitals when creating .bbl file.