400 PROCEEDINGS OF THE ACADEMY OF [Jime, 



A CONTEIBTJTION TO THE KNOWLEDGE OF THE ACEIDID^ (ORTHOPTERA) 



OF COSTA RICA. 



BY JAMES A. G. REHN. 



The following study was based on a series of two hundred and ninety- 

 one specimens from various localities in Costa Rica, and in the col- 

 lections of the Academy, Mr. ^lorgan Hebard of Chestnut Hill, Phila- 

 delphia, and the United States National Museum. These collections 

 were represented respectively by one hundred and fifty-nine, one hun- 

 dred and twelve, and twenty specimens. 



The author wishes to thank Mr. Hebard and Dr. Ashmead of the 

 National Museiun for permission to study portions of the material, 

 and for other favors rendered during the preparation of this and other 

 papers. 



It is proposed to follow this contribution at a later date with others 

 on the Tettigonidte and Gryllidte of Costa Rica, interesting collections 

 of which are now in hand. 



Subfamily ACRIDIN.E (TruxaUnce Axict .) . 

 TRTJXALIS Fabricius. 

 1775. Truxalis Fabricius, Syst. En torn., p. 279. 



Included nasutus and brevicornis, of which the latter is the type 

 nastitus being one of the two congeneric species on which linnaeus 

 based the genus Acrida. 



Truxalis brevicornis (Johansson). 



1763. Gri/Uus brevicornis Johansson, Amcen. Acad., '\^I, p. 398. [America 

 septentrionali.] 



San Carlos, Costa Rica. (Schild and Burgdorf.) [U. S. N. M.J 

 One female. 



Carrillo, Costa Rica. [Hebard collection.] Ten males, ten females. 



Both color phases are represented, some of the females having dis- 

 tinct though small maculations on the axillary field of the tegmina. 



SILVITETTIX Bruner. 



1904. Silvitettix Bruner, Biol. Cent.-Amer., Orth., II, p. 55. Type.— 5. 

 communis Bruner. 



Silvitettix oommunis Bruner. 



1904. Silvitettix communis Brvmer, Biol. Cent.-Amer., II, p. 56. [Monte 

 Redondo Juan Vefias and Pozo Azul, Costa Rica.] 



