The Morphology of the Mouthparts of the Non-Biting Blackfly, Eusimulium Dacotense D. & S., as Compared with Those of the Biting Species, Simulium Venustum Say (Diptera: Simuliidae)12

The Simuliidae have for many years attracted attention because of their blood-sucking habits and vicious manner of attacking man and animals; and more recently, because of their role in the transmission of pathogenic organisms. The mouthparts of various species of this family have been studied and described by a number of writers, but the work of these men has been limited mostly to the study of the female mouthparts, no doubt because those of the male are not constructed for blood-sucking.