182 On the American Locust. 



not unknown in the western parts of North- America, 

 and even in some of the countries of Mexico*. The 

 Locust of the East is the Gryllus migratorius of Lin- 

 naeus. It not only differs generically from the North- 

 American Tettigonia, but the two animals are totally 

 distinct from each other in some of the most interesting 

 circumstances of their natural history. 



The following are the descriptions of these two in- 

 sects, as they are given by Linnjeus, in the Systema 



Nature: 



Cicada (septendecim) nigro-virescens, elytris margine 

 flavrescente, capite utrinque octo- striate Tom. 1. 

 pars lL/>. 708. 



Gryllus (migratorius) thorace subcarinato: segmento 

 unico, capite obtuso, maxillis atris. Tom. 1. pars 

 11. p. 700. 



Fabricius, it has already been observed, considers our 

 locust as a species of Tettigonia. Of this genus we 

 have, in die United- States, several species, besides the 

 T. Septendecim, the immediate subject of these notes, 

 or memorandums. One of these, the Tettigonia Ti- 

 bicen of Fabricius, is the large and beautiful insect 

 called, in Virginia, the " Dry-Fly," the male of which 

 regularly begins its shrill and loud note in the neigh- 

 bourhood of Philadelphia, between the first and seventh 

 of July ; generally about the seventh of the month. 



* Sec Journal, Part First, p. 137—144. 



