Slide showing diagram/drawing of 'Transverse section of anntenae of Sericomyia borealis'. Slide shows black and white diagram of 'Transverse section of anntenae of Sericomyia borealis x 600'; title shown at bottom of image. The Sericomyia is a variety of hoverfly. Undecipherable word hand written on tape on top of image, reads 'Chemoniception(?)' Late 19th - early 20th century