50 GUIDE TO ORTHOPTERA 



and Oedaleonotus along the Pacific coast. Nine of these twenty- 

 one genera, viz. Phaedrotettix, Rhabdotettix, Cyclocercus, 

 Paraidemona, Campylacantha, Hesperotettix, Melanoplus, Phoe- 

 taliotes and Poecilotettix, range southward into Mexico. Podisma 

 is also found in the Old World, but the remainder are strictly 

 indigenous types. Dimorphism in respect of the length of the 

 organs of flight is common in many of the genera, but a number 

 of them are uniformly subapterous. 



Dactyloti. 



This is a Central American group of two or three genera, of 

 which only the genus Dactylotum Charpentier is represented, by 

 a single species, in our country, occurring 'from Dakota to Texas 

 along the eastern front of the Rocky Mountains. 



