142 Journal New York Entomological Society. ^^°^- xxvi. 



face of the ground. As far as is known this is the first species of 

 Okanagana found in the Gulf States east of Texas. 



The key to genera and species not only covers the cicadas from 

 Mississippi, but the southeastern United States in general. The only 

 species of the region not occurring in Mississippi are Tibicen canicu- 

 laris (Harris), found at least as far south as Cape May County, New 

 Jersey, and Tibicen biconica (Walker) of Florida and the West 

 Indies. These two species are figured as a further aid to their identi- 

 fication. 



The Tettigonia variegafa Fabricius, from " Carolina," has not 

 been identified, owing to faulty description. It may be one of several 

 of our well-known species. Francis Walker described Cicada reso- 

 nans, Cicada viridifascia, Fidicina figurata and Fidicina olynipusa 

 without locality, but the species have been credited to North America 

 by Distant in Genera Insectorum, who placed them in two instances 

 as synonyms of Tibicen auletes. All four names have here been 

 applied to species native to Mississippi and nearby states. It is hoped 

 that this has been done correctly, but whether correctly or not it has 

 seemed preferable to use the names until the matter can be settled, 

 as it will be in time by the growth of more extensive collections, and 

 perhaps by the examination of the specimens described by Walker, 

 if they at this time can surely be identified as his material. 



Of the twenty species mentioned in the present paper, sixteen be- 

 long to the genus Tibicen and are so listed by Mr, Van Duzee in his 

 Catalogue of the Hemiptera. The remaining four genera contain 

 but one species each. 



Thanks are due to Dr. Wm. H. Wiegmann, of the New York 

 Entomological Society, who has kindly subjected the keys to the test 

 of determining specimens, and it is hoped that they will be found of 

 service. 



Key to Genera of Cicadas of the Southeastern United States. 



Tympanal coverings concealing tympanal orifices. 



Head large and broad, body walls of abdomen thickened ; opercula 



large Tibicen Latreille. 



Head small, abdomen translucent ; opercula very small. .Cicada Linnaeus. 

 Tympanal coverings absent. 



Cells of median area of fore wings longer than marginal cells. 



Head (including eyes, which are red in life) nearly as broad as base 



