FROM his morphological investigation of the black bean aphid, Aphis fabae Scop., Weber 1 concluded that the stylets do not contain nerves, and he showed the central mandibular duct to be empty.

University of Guam entomology researchers photograph mounted aphid features through a Zeiss Axiolab microscope using a Nikon Coolpix 990 digital camera at magnifications of 50x-400x. The features ...