Slide showing eight photographs of Abraxas grossulariata moths. Slide shows black and white photographs of eight moths. The explanatory text below these photographs reads: 'Abraxas grossulariata and its var, lacticolor. On the left, typical A. grossulariata, two males above, two females below. on the right, var. lacticilor, two males above, two females below'. Late 19th to early 20th century