. 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. Fig. 91.—Venation of Macro- siphum. (After Patch.) Fig. 92.—Venation of Toxoptera. (After Patch.) Plant-lice or Aphids are gregarious sucking insects, often abundant on many varieties of plants, and doing much injury. Three forms occur: i. sedentary wingless viviparous agamic females, 2. migra- tory winged viviparous agamic females, 3. sexual males and females —the females oviparous and wingless and the males winged or
. 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. Fig. 91.—Venation of Macro- siphum. (After Patch.) Fig. 92.—Venation of Toxoptera. (After Patch.) Plant-lice or Aphids are gregarious sucking insects, often abundant on many varieties of plants, and doing much injury. Three forms occur: i. sedentary wingless viviparous agamic females, 2. migra- tory winged viviparous agamic females, 3. sexual males and females —the females oviparous and wingless and the males winged or wingless. Sc*R-'M*CuflstA Sc 5c*R^M*Cu*lstA - 4 —5c. Fig. 93.—Venation of Telra- netira. (After Patch.) Fig. 94.—Venation of Chermes. (After Patch.) Reproduction among the aphids may be represented diagrammatic- ally as follows: O—P—P—P—P—P—P—P—P(^ ^0 9 = P = P_P—p_P—p/ \o 9 where 0 represents the overwintering egg, P the viviparous agamic. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
