XeLaTeX: Installed Italic font not appearing

Question

Italics go missing when I change to a font that is installed and I can't figure out why.

Here is the installed font, (as shown in Mac OS's Font Book):

Here's a MWE:

\documentclass[fontsize=14.5pt,
paper=a6,
DIV=14,
pagesize]{scrartcl}                 
\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text}
\setmainfont{BentonModernFour}
%\setromanfont[Mapping=tex-text]{BentonModernFour-Roman}% Doesn't work
%\setromanfont[Mapping=tex-text]{Hoefler Text} %Works
\begin{document}

No one gave their real names but \textit{nommes de guerre}.

\end{document}

Yields only this:

I've looked at: including own fonts in xelatex with fontspec doesn't work for "bold" "italic" font faces

But this doesn't work for me. I've also looked at Fontspec can't find italic font (installed later) but will use condensed (installed first) on OSX

which explains how to update the font cache for LuaLaTeX, but not XeLaTeX. LuaLaTeX yields the desired output, but XeLaTeX does not. How can I fix this? Here is the log file: https://www.dropbox.com/s/kb86n5as1sog613/mwe%2Bitalics%2Bxe.log?dl=0

Apparently, this is a recurring problem. Here's someone on a different forum from 2012: https://latex.org/forum/viewtopic.php?t=20135

Adding ItalFont=(name of font)as a fontspec option didn't work. As did ItalicFont=*.otf (see image)

Answer 1

This should work.

a) Select font by name:

\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont[UprightFont       = *-Roman ,
             BoldFont          = *-Bold ,
             ItalicFont        = *-Italic ,
             BoldItalicFont    = *-BoldItalic ,
             Ligatures=TeX]{BentonModernFour}
\begin{document}

No one gave their real names but \textit{nommes de guerre}.

\end{document}

b) Select font by file:

\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont[Path=/path/to/font/files/ ,
             Extension = .otf ,
             UprightFont       = *-Roman ,
             BoldFont          = *-Bold ,
             ItalicFont        = *-Italic ,
             BoldItalicFont    = *-BoldItalic ,
             Ligatures=TeX]{BentonModernFour}
\begin{document}

No one gave their real names but \textit{nommes de guerre}.

\end{document}

BTW: You can find a more detailed explanation on how font selection works in the fontspec-manual

Answer 2

\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont{BentonModernFour}[
  UprightFont    = *-Roman,
  BoldFont       = *-Bold,
  ItalicFont     = *-Italic,
  BoldItalicFont = *-BoldItalic,
]
\begin{document}
foo \textit{bar}
\end{document}