. Annals. Entomology. 1923] Wadley: Factors Affecting Forms of Aphids 281 Rhopalosiphum. The life history has been outHned by Pergande (13) and by Baker and Turner (1.) The species is widely dis- tributed over the United States and the world. It is most common on wheat and oats, and on apple as a winter host, but occurs on a number of grains, grasses and other Figure I. Rhopalosiphum prunifoliae Fitch. 1—Winged adult, x 20. 2—Wingless adult, newly-matured, x 20. 3- Wingless adult, several days after maturity, x 20 adult, X 50. 5—Antenna wingless adult, x 50' 4—Antenna winged The winge
. Annals. Entomology. 1923] Wadley: Factors Affecting Forms of Aphids 281 Rhopalosiphum. The life history has been outHned by Pergande (13) and by Baker and Turner (1.) The species is widely dis- tributed over the United States and the world. It is most common on wheat and oats, and on apple as a winter host, but occurs on a number of grains, grasses and other Figure I. Rhopalosiphum prunifoliae Fitch. 1—Winged adult, x 20. 2—Wingless adult, newly-matured, x 20. 3- Wingless adult, several days after maturity, x 20 adult, X 50. 5—Antenna wingless adult, x 50' 4—Antenna winged The winged adult (Fig. I) is to mm. long, and to mm. in greatest width of body. The wingless adult is to mm. long and to mm. in greatest width. The newly born nymph is to mm. long and to mm. wide. The nymphs are light green at birth, their color deepening somewhat during growth. Reddish areas are found. 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 Entomological Society of America. Baltimore [etc. ]
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