of Insects. Kluwer Academic Publishers. 2004 Gilbert, L.I. (ed.). 2004. Comprehensive molecular insect science, 7 vols. Elsevier Pergamon, published in St. Louis A paper in Science found that Culex pipiens mosquitoes existed in two populations in Europe, one which bites birds and one which bites humans. In North America 40% of Culex pipiens were found to be hybrids of the two types which bite both birds and humans, providing a vector for West Nile virus. This is thought to provide an explanation of why the West Nile disease has spread more quickly in North America than Europe. 2005 The Insect Biocontrol Laboratory at the Henry A. Wallace Beltsville Agricultural Research Center in the United States develops DNA fingerprinting tools that match hard-to-identify larvae to adults that have been positively identified. Michael S. Engel and David Grimaldi Evolution of the Insects published. See also List of entomologists Timeline of entomology — for a list of other available time periods Entomology Entomology post 1900