242 PROCEEDINGS OF THE NATIONAL MUSEUM voi,. loe 



River; Mapiri River; Reyes; Rosario, Lake Rogagua; Rurrenabaque; 

 Tumupasa. 



Beazil: Fortaleza; Mandos; Natal. 



Chile: Cerrillos de Tamaya; Puerto Oscuro. 



PERtJ: Cerro Azul; Chanchamayo, Department of Junfn; Divisoria; 

 Fundo Chela; Fundo Sinchono; Huancayo; "La Merced," Chancha- 

 maj^o; Pucallpa; Tingo Maria, 



The grylloids from Peril were known by the study made by Caudell 

 (1918) while most of the Bohvian species have been recorded by Bruner 

 (1916) in his paper on South American crickets. 



[Since this manuscript was prepared, and after considerable delay 

 in pubHcation, I have contributed another paper on Peruvian crickets 

 (Chopard, 1954) that was based on material collected by the Hamburg 

 South Peril Expedition of 1936. The general features of that material 

 were discussed by Titschack (1951).! 



The present collection provides valuable detailed data on the dis- 

 tribution of the grylloids in Bolivia and Peru, from which countries 

 three-fourths of the material has come. The study of the collection 

 does not bring important changes in our knowledge except in the 

 addition of a relatively considerable number of new species. These 

 new species belong especially to the family Trigonidiidae and to the 

 genera Diatrypa and Aphonomorphus of the Podoscirtinae. The 

 presence of species belonging to the genera Rhicnogryllus and 

 Metioche, which were not known in South America, is noteworthy. 

 It confirms the fact that those small crickets, living in very damp 

 places, have a verj'^ wide geographical distribution. 



I have tried to give keys to the American genera of Grylloidea. 

 I trust they will prove of use to American entomologists in spite of 

 unavoidable imperfections. 



Superfamily GRYLLOIDEA 

 Family Gryllotalpidae 

 Key to the American genera 



1. Anterior tibiae with two dactyls; anterior trochanter bearing a long proc- 



ess Scapteriscus Scudder 



Anterior tibiae with four dactyls ; anterior femora bearing a short process . . 2 



2. Very small and slender species; anterior tibiae with open tympanum. 



Gryllotalpella Rehn 



Larger and much stouter species; anterior tibiae with more or less closed 



tympanum 3 



3. Posterior tibiae unarmed or armed with one spine only; branches of the Sc 



in the lateral field of elytra very short and perpendicular to the elytra! 



margin Neocurtilla Kirby 



Posterior tibiae armed with several spines on the superointernal margin; 

 branches of the Sc long, oblique Gryllotalpa Latreille 



