32 THE UNIVERSITY SCIENCE BULLETIN. 



Of the great subfamily JassinsR, we find representatives in 

 all parts of the United States. Here too, hov^ever, we see many 

 restrictions to certain regions. Thus the genus Acucephalus 

 is confined largely to the Northeastern states. Cicadula, 

 Thamyiotettix and others are largely northern, Uhleriella, 

 Aligia, Neocoelidia and others largely western, SpanghergieUa 

 and Achiopterus essentially southern, while still others, such as 

 Deltocephalus, seem to find their optimum conditions in the 

 Middle West. Others are undoubtedly largely Rocky Mountain 

 forms. Some genera, on the other hand, and even some species, 

 seem to be able to find favorable conditions clear across the 

 continent and from the north to the south, so that they may be 

 spoken of as occurring throughout the United States. 



