Originally Posted by sartori
From a search of "moquim insect" at books.google.com
1st book result : Chambers's Edinburgh journal, conducted by W. Chambers. - Page 458
Everywhere in long grass lurks the 'moquim,' a little red insect, so small as to be almost imperceptible, but which fastens on the legs, causing the most intolerable itching.
In which case, the modern equivalent is likely to be "chigger".