The summer fishfly, Chauliodes pectinicornis, is perhaps the best-known of these in North America; its immense mating swarms in the Upper Mississippi River region fill the air on a few summer nights each year much like mayflies in certain regions of Europe, leaving millions of carcasses to be cleaned up the next day.
The summer fishfly, Chauliodes pectinicornis, is a well-known species in North America known for its large mating swarms that occur in the Upper Mississippi River region each summer. These swarms are similar to those found in certain European regions and result in millions of dead flies the next day.