...at same World Catalog of Bee Flies (Diptera: Bombyliidae) Web Site =v= linked to above.

PDF files for the original 1999 version of the catalog are still available on that web page, though the links to files for the 2003 version have been removed (at least at time of this post).

One difference in the revised 2015 version (for our coverage area) is the addition of many species of the phthirine genus Tmemophlebia published since 2003...see comments here.

There are many other changes as well that impact the nearctic region, as can be seen quickly by comparing the "Nearactic" column in the numerical summaries of taxa (appearing on pg xiii of both the 2015 and 2013 versions). But note that all of Mexico, except it's extreme far south, is included in their delimitation of the Nearctic region (given on pg. xxvi).