. Bulletin. Natural history; Natural history. 336 Illinois Natural History Sirvev Billetix siderable economic importance. According to Theobald (1926), a sex- ual reproduction may continue in greenhouses for years without the appearance of the sexual forms, which have not as yet been described. If recent synonymy is correct, and it seems to be. Gillette (1!I08) has redescribed this species under the name of Myciis vuicac. The majority of specimens of this species have a horseshoe-shaped brownish area on the dorsum of the Fig. 39. Characteristic grouping of tlie black cherry aphid. My
. Bulletin. Natural history; Natural history. 336 Illinois Natural History Sirvev Billetix siderable economic importance. According to Theobald (1926), a sex- ual reproduction may continue in greenhouses for years without the appearance of the sexual forms, which have not as yet been described. If recent synonymy is correct, and it seems to be. Gillette (1!I08) has redescribed this species under the name of Myciis vuicac. The majority of specimens of this species have a horseshoe-shaped brownish area on the dorsum of the Fig. 39. Characteristic grouping of tlie black cherry aphid. Myzus ccrasi (Fabricius), on under sides of leaves of new growth on the cherry. Prnnus avium: Urbana, June 7. 1929. Data associated with our viviparous specimens are as follows: Evans- ton (May 6), 1927; Oarbondale (June 4), Chicago (June 1-1). Kankakee (June 29), Starved Rock State Park (June 13). 192S; Urbana (Oct. 15), 1929. Collected on Anchuxa mnosnthUflora. Chriisauthrmum. Fuchsia sp., Oeranium. sp., Iponiora maxima, Lilium sp., and 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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