380 ENTOMOLOGY 



United States by passing to the east or to the west of these 

 barriers, in the former case skirting the Gulf of Mexico and 

 spreading northward along the Mississippi valley or along the 

 Atlantic coast, in the latter event traveling along the Pacific 

 coast to California and other Western states. Not a few spe- 

 cies, however, have made their way from the Mexican plateau 

 into New Mexico and Arizona; this is true of many Sphin- 

 gidse. The butterfly Anosia berenice ranges from South 

 America into New Mexico, Arizona and Colorado ; while many 

 of the Libytheidse have entered Arizona and neighboring states 

 from Mexico. The chrysomelid genus Diabrotica is almost 

 exclusively confined to the western hemisphere and its home 

 is clearly in South America, where no less than 367 species are 

 found. About 100 species occur in Venezuela and Colombia, 

 " of which 1 1 extend into Guatemala, 8 into Mexico, and i 

 into the United States." \Ve have 18 species of Diabrotica, 

 almost all of which can be traced back to Mexico, and several 

 of them as the common D. longicornis to Central America. 

 " The common Dynast cs tityus occurs from Brazil through 

 Central America and Mexico, and in the United States from 

 Texas to Illinois and east to southern New York and New 

 England." Erebus odor a ranges from Ecuador and Brazil to 

 Colorado, Illinois, Ohio, New England and into Canada, 

 though it is not known to breed in North America, being in 

 fact a rare visitor in our northern states. 



Southeast. Many South American species have made their 

 way into southern and western Florida by way of the West 

 Indies, while some subtropical species have reached Florida 

 probably by following around the Gulf coast. The semi- 

 tropical insect fauna of southern and southwestern Florida, 

 including about 300 specimens of Coleoptera, according to 

 Schwarz, is entirely of West Indian and Central American 

 origin, the species having been introduced with their food 

 plants, chiefly by the Gulf Stream, but also by flight, as in the 

 case of Sphingidae. Ninety-five species of Hemiptera collected 

 in extreme southern Florida by Schwarz and studied by Uhler 



