Abstract: Studies on the insemination rates of mosquito populations in Makurdi, Benue State, Nigeria were carried out using four mosquito infested localities: High-level, Wurukum, North- bank and Wadata, over a 12 month period. A total of 4,320 adult female mosquitoes, comprising anopheline and culicine species were identified and dissected using standard procedures. Of these, 1,040 (24.1%) were Anopheles gambiae sensu lato (s.l.); 641 (14.8%) were Aonopheles funestus Giles and 2,418 (56.0%) of the mosquitoes were Culex quinquefasciatus Say while 221 (5.1%) were tagged ‘unidentified’ species of Anopheles mosquitoes.