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- 
gide. The butterfly Anosia berenice ranges from South 
America into New Mexico, Arizona and Colorado; while many 
of the Libytheidze 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 11 extend into Guatemala, 8 into Mexico, and I 
into the United States.”” We 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 Dynasties 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.” Lrebus odora ranges from Ecuador and Brazil to 
Colorado, Illinois, Ohio, New England and into Canada, 
though it is net 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 Sphingidz. Ninety-five speciesof Hemiptera collected 
in extreme southern Florida by Schwarz and studied by Uhler 
