. Fig. 4. — Distribution of the Northern Illinois Brood (Marlatt's XIII) of periodical cicadas in Illinois. Black dots indicate positive records of adult specimens, skins, holes in the ground, flagging tree branches, or singing. Circles imlicatp negative records in areas carefully searched. \\'oods south of Springfield and woods near Me- chanicsburg showed no e%'idence of cicadas (sped- niens, singing, skins, or holes in the ground). During the preceding year, 1972. the Great Southern Brood emerged in these woods {A. L. Koelling personal com- munication 1973). At the Springfield and Mecliani(.

---

. Fig. 4. — Distribution of the Northern Illinois Brood (Marlatt's XIII) of periodical cicadas in Illinois. Black dots indicate positive records of adult specimens, skins, holes in the ground, flagging tree branches, or singing. Circles imlicatp negative records in areas carefully searched. \\'oods south of Springfield and woods near Me- chanicsburg showed no e%'idence of cicadas (sped- niens, singing, skins, or holes in the ground). During the preceding year, 1972. the Great Southern Brood emerged in these woods {A. L. Koelling personal com- munication 1973). At the Springfield and Mecliani(.> burg area, at least, this brood and the 13-\oar Groat Southern Brood probablv emerged siniultaneouslv in 1582 and 1803, and will do so again in 2024 and 2245. The persistence of this brood in old parts of cities was noted in Chicago and Rockford. Mrs. Barbiua Fell noted a few skins in her back yard at S19 North

---

Size: 1669px × 2994px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookpublisherurban, booksubjectperiodicalcicada