. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS I39 A A. Front wings with three oblique veins, the media simple (unbranched), radial sector merged with margin of stigma; antennae never more than 5- segmented. B. Antennae s-segmented; wings at rest folded upright; galls on conifers. —Chermes. BB. Antennae 3- or 4-segmented; wings at rest flat on back; galls on grape, hickory, etc., never on conifers.—Phylloxera. Sc*RtM

---

. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS I39 A A. Front wings with three oblique veins, the media simple (unbranched), radial sector merged with margin of stigma; antennae never more than 5- segmented. B. Antennae s-segmented; wings at rest folded upright; galls on conifers. —Chermes. BB. Antennae 3- or 4-segmented; wings at rest flat on back; galls on grape, hickory, etc., never on conifers.—Phylloxera. Sc*RtM*Cu* 1st A 5c Sc^R*M*Cu*lstA Sc. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lochhead, William, 1864-. Philadelphia, Blakiston

---

Size: 2279px × 1096px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919