This research was carried out to study the morphometric and molecular differences in populations of Phlebotomus orientalis from three different regions in Sudan. Samples of Phlebotomine sandflies were collected from Gedaref, White Nile and Khartoum States. The specimens of P. orientalis were collected using CDC miniature light traps and sticky paper traps. The sand fly specimens were then mounted on glass slide on Breleses medium and identified to species level. Then mounted samples of P. orientalis were processed for morphometric measurements of 23 and 29 characters for females and males...