The Anatomy of the Adult Male Reproduction System of Aedes aegypti (Linnaeus) (Diptera, Culicidae)1

Re-investigation of the anatomy of the external reproductive system of adult male Aedes aegypti (Bangkok strain) shows, in addition to the already known facts, that (1) the 9th sternum is composed of anterior and posterior regions sharply divided from each other by the intersegmental membrane, (2) the basal paraproct (10th tergum) is attached to the dorsal root of the basimere and not to the lobe of the 9th tergum, and (3) the epiproct (remnant of the 11th tergum) is attached to the complex apical paraproct (10th sternum?). The present study of the internal genital system includes a description of the attachments of the apical filament of the testis and of the filaments of the accessory glands, and of the innervation of the different parts. It is suggested that the thin-walled tubes leading from the testes are the true vasa efferentia, and that the short, thickerwalled muscular region between them and the seminal vesicles represents the vasa deferentia. Males of 7 other species belonging to 4 genera of mosquitoes were dissected and compared with Aedes aegypti .