The winged female woolly aphid (Schizoneura lanigera), a species of plant lice of the Eriostoma family.

Adult Woolly Aphid

The winged female woolly aphid (Schizoneura lanigera), a species of plant lice of the Eriostoma family.

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse." -Whitney, 1911

Grape Gall Louse

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse."…

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse." -Whitney, 1911

Grape Gall Louse

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse."…

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse." -Whitney, 1911

Grape Gall Louse

"Grape Gall-louse (Phylloxera vastatrix), the small figures showing natural sizes. Form of mature louse."…

"Resin-gnat (Diplosis resinicola). a, adult female; b, wing of same; c, cross-section of antenna of female; d, same of male; e, section of pine twig showing work of larvae; f, same showing extruded pupa-cases; a, e, f, enlarged; b, c, d, still more enlarged." -Whitney, 1911

Resin Gnat

"Resin-gnat (Diplosis resinicola). a, adult female; b, wing of same; c, cross-section of antenna…

"The 'leaf bug' (Dicyphus minimus): a, newly hatched; b, second stage; c, nymph; d, adult; e, head and beak from side--enlarged (original)." -Department of Agriculture, 1899

Leaf Bug

"The 'leaf bug' (Dicyphus minimus): a, newly hatched; b, second stage; c, nymph; d, adult; e, head and…

Adult harmless mosquito.

Mosquito

Adult harmless mosquito.

Adult harmful mosquito

Mosquito

Adult harmful mosquito