. Bulletin. Natural history; Natural history. 358 Illinois NATrisAL Histoky Survey /(/;);/ produces a very heavy infestation every year, and has in the course of time markedly stunted their growth and sapped their vitality. At the time of the production of the sexual forms, some of these heav- ily infested trees jjroduce so many winged lice that large piles of them accumulate under the trees. This species has heen taken only on Ulmus fulva and Ulinus data, and our records indicate that the entire life cycle is passed on the one host. A large series of specimens shows that this species
. Bulletin. Natural history; Natural history. 358 Illinois NATrisAL Histoky Survey /(/;);/ produces a very heavy infestation every year, and has in the course of time markedly stunted their growth and sapped their vitality. At the time of the production of the sexual forms, some of these heav- ily infested trees jjroduce so many winged lice that large piles of them accumulate under the trees. This species has heen taken only on Ulmus fulva and Ulinus data, and our records indicate that the entire life cycle is passed on the one host. A large series of specimens shows that this species is very variable in regard to certain structural characters which have been used in the past to separate G. uliiii and G. gillcttci. In fact, there is such great variation that we believe that in Illinois there is onlv one good. Fig. 44. An elm leaf curl caused by OcorgiapTiix ttlmi (Wilson) on the slippery elm, Ulmits fulva: Urbana. June 10, 1929. species in the genus, and that (jiUcttcl is only a variation of uliiii. Mr. A. C. has studied our material and says in corresjwndence on the matter: "I am beginning to fear that there is but one species of Georgia phis, in which case giUcttci would become of synonym of ; Records of this species in our collection are as follows: I'rbana (June 14), : Berwyn (June 15), Carbondale (June 4). East Dubuque (June 25), Herod (May 29), Jit. Carmel (May 26), Oakwood (June 17). Oregon (June 27), Pekin (June 20), Urbana (May 22. June 11 and 14). 1928: I'rbana (June 4 and 11), 1929. Sexual forms liave been taken at I'rbana during the first two weeks of 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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