. Bulletin. Natural history; Natural history. 290 Illinois Natihal History Slrvey Billetix The combination of structural characters of this new species is such that we know of no very closely allied species within the genus. It is most easily separated from all other described Capitophoriis by virtue of its extremely short cornicles. According to our observations. this species is at times abundant locally, but it is difficult to locate be- cause its general color agrees so well with that of its host plant. A plant of Achillea found in Starved Rock State Park was so heavily infested by this spe
. Bulletin. Natural history; Natural history. 290 Illinois Natihal History Slrvey Billetix The combination of structural characters of this new species is such that we know of no very closely allied species within the genus. It is most easily separated from all other described Capitophoriis by virtue of its extremely short cornicles. According to our observations. this species is at times abundant locally, but it is difficult to locate be- cause its general color agrees so well with that of its host plant. A plant of Achillea found in Starved Rock State Park was so heavily infested by this species that many of the leaves were turning brown. CAPITOPHORUS POAE (Gillette) RhopaJosivhum poae Gillette, Canadian Entomologist. Vol. XL, No. 2. Feb- ruary, 190S, p. 61. This species has been recorded from .Aurora, Illinois, by Davis (1911b) under the name of Rhopalosiphum poac. It was not found by us in our collecting during 1958 to 1930 and apparently is not very abundant. Gillette mentions that it is capable of killing blue grass. Only the viviparous females have thus far been described. Data associated with slides deposited in the Survey collection through the kindness of Professor Davis are as follows: Aurora. Xov. 14. 1910. and Rockford, Nov. 12, 1912. All specimens taken on Poa pratensis. CAPITOPHORUS RIBIS (Li.\x.\EUs) Fios. 34, 167 ApMs ribis Linnaeus, Systema Naturae, Editio Decima, 1758. p. The currant aphid, which causes a characteristic distortion or "puffiness" and reddish discoloration of the leaves ( Fig. 34 ). was first. Fig. 34. Malformation of leaves of the red currant, Ribcs ml- pare, caused by the currant aphid, Capitophonis ribis (Linnaeusl; Champaign, June 14, 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, Stat
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